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Release Notes for Cisco  4000 Series for Cisco  IOS Release  12.0 T

Release Notes for Cisco  4000 Series for Cisco  IOS Release  12.0 T

December 14, 1998

These release notes describe new features for the Cisco  4000 series routers that support Cisco  IOS Release  12.0 T, up to and including Release  12.0(2)T. Cisco  IOS Release  12.0(2)T is based on Cisco  IOS Release  12.0. These release notes are updated with each maintenance release of the Cisco  IOS software, which is typically every 6 weeks.

Use these release notes in conjunction with the cross-platform Release Notes for Cisco IOS Release  12.0  T located on Cisco Connection Online (CCO)  and the Documentation CD-ROM.  

For a list of software caveats that apply to Release 12.0(2)T, refer to the "Caveats" section. Also, you can refer to the Caveats for Cisco IOS Release 12.0 T document that accompanies these release notes and is located on Cisco Connection Online and the Documentation CD-ROM.

Contents

These release notes discuss the following topics:

Introduction

The Cisco 4000 series routers run Cisco IOS software, Cisco's industry-leading networking software that provides a variety of feature sets. You can choose a feature set that supports your specific protocol environment. Cisco IOS software ensures robust, reliable internetworks by supporting both LAN and WAN protocols, optimizing WAN services, and controlling internetwork access. In addition, Cisco IOS software allows centralized, integrated, and automated installation and management of internetworks.

The Cisco 4000 series routers offer Flash memory EPROM technology as a standard feature. Flash memory EPROMs enable you to distribute new software releases from a central location. After the software is distributed, the routers can reboot from programs stored in local Flash memory.

All models provide a configurable modular router platform by using network processor modules (NPMs)---individual removable cards used for external network connections. Because the router's modules support many variations of protocols, line speeds, and transmission media, the Cisco 4000 series can accommodate all types of network computing environments. As Cisco introduces new modules, the Cisco 4000 series can be upgraded to keep pace with technological advances.

System Requirements

This section describes the system requirements for Release 12.0 T and includes the following sections:

Memory Requirements

Table 1 describes the memory requirements of the Cisco  IOS feature sets for the Cisco  4000 series for Release 12.0 T.


Table 1: Memory Requirements for the Cisco  4000 Series
Feature Set by Platform Image Name Required Flash Memory Required DRAM Memory Runs From In1

Cisco  4000 and Cisco  4000-M

IP

c4000-i-mz

4 MB

16 MB

RAM

IP Plus

c4000-is-mz

4 MB

16 MB

RAM

IP Plus 40

c4000-is40-mz

8 MB

16 MB

RAM

IP Plus IPSec 56

c4000-is56i-mz

8 MB

16 MB

RAM

IP Plus IPSec 3DES

c4000-ik2s-mz

4 MB

16 MB

RAM

(2)

IP/IPX/AT/DEC

c4000-d-mz

4 MB

16 MB

RAM

IP/IPX/AT/DEC Plus

c4000-ds-mz

8 MB

16 MB

RAM

Cisco 4000 and Cisco 4000-M (continued)

Enterprise Plus

c4000-js-mz

8 MB

32 MB

RAM

Enterprise Plus 40

c4000-js40-mz

8 MB

32 MB

RAM

Enterprise Plus IPSec 56

c4000-js56i-mz

8 MB

32 MB

RAM

Enterprise Plus IPSec 3DES

c4000-jk2s-mz

8 MB

16 MB

RAM

(2)

Enterprise/APPN Plus

c4000-ajs-mz

8 MB

32 MB

RAM

Enterprise/APPN Plus 40

c4000-aj40-mz

8 MB

32 MB

RAM

Enterprise/APPN Plus IPSec 56

c4000-ajs56i-mz

8 MB

32 MB

RAM

Enterprise/APPN Plus IPSec 3DES

c4000-ajk2s-mz

8 MB

32 MB

RAM

(2)

Cisco  4500/
4500-M,
Cisco  4700/ 4700-M

IP

c4500-i-mz

82 MB

163 MB

RAM

IP Plus

c4500-is-mz

8 MB

32 MB

RAM

IP Plus 40

c4500-is40-mz

8 MB

32 MB

RAM

IP Plus IPSec 56

c4500-is56i-mz

8 MB

163 MB

RAM

IP Plus IPSec 3DES

c4500-ik2s-mz

8 MB

32 MB

RAM

(2)

IP/IPX/AT/DEC

c4500-d-mz

8 MB

163 MB

RAM

IP/IPX/AT/DEC Plus

c4500-ds-mz

8 MB

32 MB

RAM

Enterprise Plus

c4500-js-mz

8 MB

32 MB

RAM

Enterprise Plus 40

c4500-js40-mz

8 MB

32 MB

RAM

Enterprise Plus IPSec 56

c4500-js56i-mz

8 MB

32 MB

RAM

Enterprise Plus IPSec 3DES

c4500-jk2s-mz

8 MB

32 MB

RAM

(2)

Enterprise/APPN Plus

c4500-ajs-mz

8 MB

32 MB

RAM

Enterprise/APPN Plus 40

c4500-ajs40-mz

8 MB

32 MB

RAM

Enterprise/APPN Plus IPSec 56

c4500-ajs56i-mz

8 MB

32 MB

RAM

Enterprise/APPN Plus IPSec 3DES

c4500-ajk2s-mz

8 MB

32 MB

RAM

(2)

Enterprise/APPN/
DBCONN

c4500-aejs-mz

8 MB

32 MB

RAM

Enterprise/APPN/
DBCONN Plus 40

c4500-aejs40-mz

8 MB

32 MB

RAM

Enterprise/APPN/
DBCONN Plus
IPSec 56

c4500-aejs56i-mz

8 MB

32 MB

RAM

Enterprise/APPN/
DBCONN 3DES

c4500-aejk2s-mz

8 MB

32 MB

RAM

(2)

1This column indicates in which maintenance release the image was introduced. For example, a (2) indicates the image was introduced in Cisco IOS Release 12.0(2)T. If no number is in this column, the image was introduced in the initial release.
24 MB for the Cisco 4500 only.
332 MB for the Cisco 4500 only.

Hardware Supported

Cisco IOS Release 12.0 T supports the Cisco  4000 series routers:


Table 2: Supported Interfaces
Interface, Network Module, or Data Rate Platforms Supported

LAN Interfaces

ATM Interface

All Cisco  4000 series platforms

Ethernet

All Cisco  4000 series platforms

Fast Ethernet

Cisco  4500 and Cisco  4700

Token Ring

All Cisco  4000 series platforms

FDDI

All Cisco  4000 series platforms

Serial

All Cisco  4000 series platforms

HSSI

Cisco  4500 and Cisco  4700

ISDN BRI

All Cisco  4000 series platforms

Channelized E1/T1 ISDN PRI

All Cisco  4000 series platforms

ATM OC-3c

Cisco  4500 and Cisco  4700

ATM DS-3

Cisco  4500 and Cisco  4700

ATM E3

Cisco  4500 and Cisco  4700

WAN Data Rates

48/56/64 kbps

All Cisco  4000 series platforms

1.544/2.048 Mbps

All Cisco  4000 series platforms

WAN Interfaces and Network Modules

56K/64K DSU/CSU

All Cisco  4000 series platforms

Channelized E1

All Cisco  4000 series platforms

Channelized T1

All Cisco  4000 series platforms

E1-G.703/G.704

All Cisco  4000 series platforms

EIA/TIA-232

All Cisco  4000 series platforms

EIA/TIA-449

All Cisco  4000 series platforms

EIA/TIA-613 (HSSI)

All Cisco  4000 series platforms

EIA-530

All Cisco  4000 series platforms

ISDN BRI

All Cisco  4000 series platforms

ISDN PRI

All Cisco  4000 series platforms

MultiChannel Interface (Channelized E1/T1)

All Cisco  4000 series platforms

Serial

All Cisco  4000 series platforms

V.35

All Cisco  4000 series platforms

X.21

All Cisco  4000 series platforms

Determining Your Cisco IOS Software Release

To determine the version of Cisco IOS software currently running on a Cisco 4000 series router, log into the router and use the show version EXEC command. The following is sample output from the show version command. The version number is indicated on the second line as shown below:

Cisco Internetwork Operating System Software
IOS (tm) 4000 Software (C4000-JS-MZ), Version 12.0(2)T, RELEASE SOFTWARE

Additional command output lines include more information, such as processor revision numbers, memory amounts, hardware IDs, and partition information.

Updating to a New Release

At the time of this printing, no product bulletins are available for upgrading to Cisco IOS Release 12.0 T. For generic information on updating to a new software release, refer to the Cisco IOS Software Release Upgrade Paths and Packaging Simplification product bulletin located on CCO. On CCO, follow this path:

Products and Ordering: More Information: Product Bulletins. Scroll to Software. Under Cisco  IOS 11.3, click the Upgrade Paths bulletin.

The Cisco IOS Software Release Upgrade Paths and Packaging Simplification product bulletin does not contain information specific to Cisco IOS Release 12.0 T, but provides generic upgrade information that might apply to Cisco IOS Release 12.0 T.

Feature Set Tables

Cisco IOS software is packaged in feature sets (also called software images) depending on the platform. Each feature set contains a specific set of Cisco IOS features. The following section lists the feature set matrix and the features supported by each feature set.

The feature set matrix (see Table 3) shows the feature set organization and lists which feature sets are available on the Cisco  4000 series for Release  12.0 T, including the feature set name, the feature set matrix term, the software image name, and the platforms supported.


Table 3: Feature Sets Supported by the Cisco  4000 Series
Feature Set Feature Set Matrix Term Software Image Platforms Supported In1

IP Standard Feature Sets

IP

Basic2

c4000-i-mz

Cisco  4000/4000-M

c4500-i-mz

Cisco  4500/4500-M, Cisco  4700/4700-M

IP Plus

Plus3

c4000-is-mz

Cisco  4000/4000-M

c4500-is-mz

Cisco  4500/4500-M, Cisco  4700/4700-M

IP Plus 40

Plus, Plus  404

c4000-is40-mz

Cisco  4000/4000-M

c4500-is40-mz

Cisco  4500/4500-M, Cisco  4700/4700-M

IP Plus IPSec 56

Plus, Plus  IPSec  565

c4000-is56i-mz

Cisco  4000, Cisco  4000-M

c4500-is56i-mz

Cisco  4500/4500-M, Cisco  4700/4700-M

IP Plus IPSec 3DES

Plus, Plus  IPSec, 3DES6

c4000-ik2s-mz

Cisco  4000, Cisco  4000-M

(2)

c4500-ik2s-mz

Cisco  4500/4500-M, Cisco  4700/4700-M

Desktop IBM Standard
Feature Sets

IP/IPX/AppleTalk/DEC

Basic

c4000-d-mz,

Cisco  4000/4000-M

c4500-d-mz

Cisco  4500/4500-M, Cisco  4700/4700-M

IP/IPX/AppleTalk/DEC Plus

Plus

c4000-ds-mz

Cisco  4000/4000-M

c4500-ds-mz

Cisco  4500/4500-M, Cisco  4700/4700-M

Enterprise Standard
Feature Sets

Enterprise Plus

Plus

c4000-js-mz

Cisco  4000/4000-M

c4500-js-mz

Cisco  4500/4500-M, Cisco  4700/4700-M

Enterprise Plus 40

Plus, Plus  40

c4000-js40-mz

Cisco  4000/4000-M

c4500-js40-mz

Cisco  4500/4500-M, Cisco  4700/4700-M

Enterprise Plus IPSec 56

Plus, Plus  IPSec 56

c4000-js56i-mz

Cisco  4000/4000-M

c4500-js56i-mz

Cisco  4500/4500-M, Cisco  4700/4700-M

Enterprise Plus IPSec 3DES

Plus, Plus  IPSec 56, 3DES

c4000-jk2s-mz

Cisco  4000/4000-M

(2)

c4500-jk2s-mz

Cisco  4500/4500-M, Cisco  4700/4700-M

Enterprise/
APPN
Standard Feature Set

Enterprise/APPN Plus

Plus

c4500-ajs-mz

Cisco  4500/4500-M, Cisco  4700/4700-M

Enterprise/APPN Plus 40

Plus, Plus  40

c4500-ajs40-mz

Cisco  4500/4500-M, Cisco  4700/4700-M

Enterprise/APPN Plus IPSec 56

Plus, Plus  IPSec 56

c4500-ajs56i-mz

Cisco  4500/4500-M, Cisco  4700/4700-M

Enterprise/APPN Plus IPSec 3DES

Plus, Plus  IPSec, 3DES

c4500-ajk2s-mz

Cisco  4500/4500-M, Cisco  4700/4700-M

(2)

Enterprise/
APPN/
DB Conn Standard Feature Set

Enterprise/APPN/
DB Conn

Basic

c4500-aejs-mz

Cisco  4500/4500-M, Cisco  4700/4700-M

Enterprise/APPN/
DB Conn Plus 40

Plus, Plus 40

c4500-aejs40-mz

Cisco  4500/4500-M, Cisco  4700/4700-M

Enterprise/APPN/
DB Conn Plus IPSec 56

Plus, Plus IPSec 56

c4500-aejs56i-mz

Cisco  4500/4500-M, Cisco  4700/4700-M

Enterprise/APPN/
DB Conn 3DES

Plus, 3DES

c4500-aejk2s-mz

Cisco  4500/4500-M, Cisco  4700/4700-M

(2)

1This column indicates in which maintenance release the image was introduced. For example, a (2) indicates the image was introduced in Cisco IOS Release  12.0(2)T. If this column is blank, the image was introduced in the initial release.
2This feature set is offered in the Basic feature set.
3This feature set is offered in the Plus feature set.
4This feature set is offered in the encryption feature sets which consist of 40-bit (Plus 40) data encryption feature sets.
5This feature set is offered in the encryption feature sets which consist of IPSec 56-bit (Plus IPSec 56) data encryption feature sets.
6This feature set is offered in the encryption feature sets which consist of Triple DES (3DES) Encryption data encryption feature sets.

Caution Cisco IOS images with strong encryption (including, but not limited to, 56-bit data encryption feature sets) are subject to U.S. government export controls, and have a limited distribution. Images to be installed outside the U.S. require an export license. Customer orders might be denied or subject to delay due to U.S. government regulations. Contact your sales representative or distributor for more information, or send e-mail to export@cisco.com.

Table 4 and Table 5 list the features and feature sets supported by the Cisco IOS Release 12.0 T for the Cisco  4000 and 4000-M.

Table 6 and Table 7 list the features and feature sets supported by the Cisco IOS Release 12.0 T for the Cisco  4500, 4500-M, 4700, and 4700-M.

All the tables use the following conventions to identify features:


Note These feature set tables contain only a selected list of features. This table is not a cumulative or complete list of all the features in each image.


Table 4: Feature List by Feature Set for the Cisco 4000 and 4000-M---Part 1 of 2
Feature Sets
Features IP IP
Plus
IP Plus
40
IP Plus
IPSec 56
IP Plus IPSec 3DES1 IP/IPX/
AT/DEC
IP/IPX/
AT/DEC
Plus
Enter-
prise Plus
Connectivity

Layer 2 Tunnel Protocol (L2TP)

No

Yes

Yes

Yes

Yes

No

Yes

Yes

RIP Enhancements

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

IP Routing
Easy IP Phase 2-DHCP Server

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

OSPF Packet Pacing

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Management
ISDN MIB RFC 2127

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Quality of Service
CLI String Search

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Switching
Cisco IOS STP Enhancements

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

WAN Services
Cisco IOS IEEE 802.1Q

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Mobile IP

No

Yes

Yes

Yes

Yes

No

Yes

Yes

PPP Over Frame Relay

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Time-based Access List

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

1This image was introduced in Cisco IOS Release 12.0(2)T.


Table 5: Feature List by Feature Set for the Cisco 4000 and 4000-M---Part 2 of 2
Features Enterprise
Plus 40
Enterprise
Plus
IPSec 56
Enterprise Plus IPSec 3DES1 Enterprise/
APPN Plus
Enterprise/
APPN
Plus 40
Enterprise/
APPN Plus
IPSec 56
Enterprise/APPN Plus IPsec 3DES1
Connectivity

Layer 2 Tunnel Protocol (L2TP)

Yes

Yes

Yes

Yes

Yes

Yes

Yes

RIP Enhancements

Yes

Yes

Yes

Yes

Yes

Yes

Yes

IP Routing

Easy IP Phase 2-DHCP Server

Yes

Yes

Yes

Yes

Yes

Yes

Yes

OSPF Packet Pacing

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Management

ISDN MIB RFC 2127

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Quality of Service

CLI String Search

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Switching

Cisco IOS STP Enhancements

Yes

Yes

Yes

Yes

Yes

Yes

Yes

WAN Services

Cisco IOS IEEE 802.1Q

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Mobile IP

Yes

Yes

Yes

Yes

Yes

Yes

Yes

PPP Over Frame Relay

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Time-based Access List

Yes

Yes

Yes

Yes

Yes

Yes

Yes

1This image was introduced in Cisco IOS Release 12.0(2)T.


Table 6: Feature List by Feature Set for the Cisco 4500/4500-M and 4700/4700-M---Part 1 of 2
Feature Sets
Features IP IP
Plus
IP Plus
40
IP Plus
IPSec 56
IP Plus IPSec 3DES1 IP/IPX/
AT/DEC
IP/IPX/
AT/DEC
Plus
Enter-
prise Plus
Enter-
prise Plus 40
Connectivity

Layer 2 Tunnel Protocol (L2TP)

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

RIP Enhancements

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

IP Routing

Easy IP Phase 2-DHCP Server

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

OSPF Packet Pacing

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Management

ISDN MIB RFC 2127

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Quality of Service

CLI String Search

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Scalability

IETF-Compliant PPP over ATM Scalability

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Switching

Cisco IOS STP Enhancements

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

WAN Services

ATM PVC Trap Support

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Cisco IOS IEEE 802.1Q

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Mobile IP

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Time-based Access List

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

1This image was introduced in Cisco IOS Release 12.0(2)T.


Table 7: Feature List by Feature Set for the Cisco 4500/4500-M and 4700/4700-M---Part 2 of 2
Features Enter-
prise Plus IPSec 56
Enter-
prise Plus IPSec 3DES1
Enter-
prise/
APPN Plus
Enter-
prise/
APPN
Plus 40
Enter-
prise/
APPN Plus
IPSec 56
Enter-
prise/
APPN Plus IPsec 3DES1
Enter-
prise/
APPN/
DB Conn
Enter-
prise/
APPN/
DB Conn Plus 40
Enter-
prise/
APPN/
DB Conn Plus IPSec 56
Enter-
prise/
APPN/
DB Conn 3DES1
Connectivity

Layer 2 Tunnel Protocol (L2TP)

Yes

Yes

Yes

Yes

No

Yes

Yes

Yes

Yes

Yes

RIP Enhancements

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

IP Routing

Easy IP Phase 2-DHCP Server

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

OSPF Packet Pacing

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Management

ISDN MIB RFC 2127

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Quality of Service

CLI String Search

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Scalability

IETF-Compliant PPP over ATM Scalability

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Switching

Cisco IOS STP Enhancements

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

WAN Services

ATM PVC Trap Support

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Cisco IOS IEEE 802.1Q

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Mobile IP

Yes

Yes

Yes

Yes

No

Yes

Yes

Yes

Yes

Yes

1This image was introduced in Cisco IOS Release 12.0(2)T.

New and Changed Information

This section lists new features introduced for the Cisco 4000 in Cisco IOS Release 12.0 T. For more information about these features, refer to the cross-platform Release Notes for Cisco IOS Release 12.0 T   located on Cisco Connection Online (CCO) and the Documentation CD-ROM, and the "Feature Modules" section.

New Features in Release 12.0(2)T

The following new features are supported by the Cisco 4000 series beginning in Cisco IOS Release  12.0(2)T.

Four New Feature Sets

Four new feature sets have been created for the Cisco 4000 series in Release 12.0(2)T that support IPSec Triple DES encryption. These feature sets include the following:

Triple DES (3DES) is a strong form of encryption that allows sensitive information to be transmitted over untrusted networks. It enables customers, particularly in the finance industry, to utilize network layer encryption. IPSec supports the Triple DES encryption algorithm (168-bit) in addition to 56-bit encryption.

New Features in Release 12.0(1)T

The following new features are supported by the Cisco 4000 series beginning in Cisco IOS Release  12.0(1)T.

Cisco IOS IEEE 802.1Q Support

Cisco IOS IEEE 802.1Q provides support for IEEE 802.1Q encapsulation for Virtual LANs (VLANs). Use this feature for VLANs consisting of IEEE 802.1Q compliant switches.

Mobile IP

Mobile IP provides users the freedom to roam beyond their home subnet while consistently maintaining their home IP address. This enables transparent routing of IP datagrams to mobile users during their movement, so that data sessions can be initiated to them while they roam; it also enables sessions to be maintained in spite of physical movement between points of attachment to the Internet or other networks. Cisco's implementation of Mobile IP is fully compliant with the Internet Engineering Task Force's (IETF's) proposed standard defined in Request for Comments (RFC)    2002.

Easy IP Phase 2-DHCP Server

With the introduction of Easy IP Phase 2, Cisco IOS software also supports Intelligent DHCP Relay functionality. A DHCP Relay Agent is any host that forwards DHCP packets between clients and servers. A DHCP Relay Agent enables the client and server to reside on separate subnets. If the Cisco IOS DHCP server cannot satisfy a DHCP request from its own database, it can forward the DHCP request to one or more secondary DHCP servers defined by the network administrator using standard Cisco IOS ip helper-address functionality.

OSPF Packet Pacing

The former OSPF implementation for sending update packets needed to be more efficient. Some update packets were getting lost in cases where the link was slow, a neighbor could not receive the updates fast enough, or the router was out of buffer space. For example, packets might be dropped if either of these topologies existed:

OSPF update packets are now automatically paced by a delay of 33 milliseconds. Pacing is also added between retransmissions to increase efficiency and minimize lost retransmissions.

OSPF update and retransmission packets are sent more efficiently. Also, you can display the LSAs waiting to be sent out an interface.

Time-Based Access Lists

It is now possible to implement access lists based on the time of day. To do so, you create a time range that defines specific times of the day and week. The time range is identified by a name, and then referenced by a function, so that those time restrictions are imposed on the function itself.

Currently, IP and IPX extended access lists are the only functions that can use time ranges. The time range allows the network administrator to define when the permit or deny statements in the access list are in effect. Prior to this feature, access list statements were always in effect once they were applied. Both named or numbered access lists can reference a time range.

RIP Enhancements

Triggered extensions to IP RIP increase efficiency of RIP on point-to-point, serial interfaces.

Routers are used on connection-oriented networks to allow potential connectivity to many remote destinations. Circuits on the WAN are established on demand and are relinquished when the traffic subsides. Depending on the application, the connection between any two sites for user data could be short and relatively infrequent.

There were two problems using RIP to connect to a WAN:

To overcome these limitations, triggered extensions to RIP cause RIP to send information on the WAN only when there has been an update to the routing database. Periodic update packets are suppressed over the interface on which this feature is enabled.

ISDN MIB RFC2127

The new Integrated Services Digital Network (ISDN) Management Information Base (MIB) RFC2127 has been designed to provide useful information in accordance with the IETF's new standard for the management of ISDN interfaces. RFC2127 provides information on the physical Basic Rate interfaces, control and statistical information for B (bearer) and D (signaling) channels, terminal endpoints, and directory numbers.

The ISDN MIB RFC2127 controls all aspects of ISDN interfaces. It consists of five groups:

The ISDN MIB RFC2127 enables you to use any commercial SNMP network management application to support ISDN call processing in Cisco IOS software. You can integrate management of dial access products using ISDN with your existing network management systems.

Layer Two Tunneling Protocol (L2TP)

Layer Two Tunneling Protocol (L2TP) is an emerging Internet Engineering Task Force (IETF) standard that combines the best features of two existing tunneling protocols: Cisco's Layer Two Forwarding (L2F) and Microsoft's Point-to-Point Tunneling Protocol (PPTP). L2TP is an extension to the Point-to-Point Protocol (PPP), which is an important component for Access Virtual Private Networks (VPNs). Access VPNs allow mobile users to connect to their corporate intranets or extranets, thus improving flexibility and reducing costs.

Traditional dial-up networking services only supported registered IP address, which limited the types of applications that could be implemented over Virtual Private Networks (VPNs). L2TP supports multiple protocols and unregistered and privately administered IP addresses over the Internet. This allows the existing access infastructure, such as the Internet, modems, access servers, and ISDN terminal adaptors (TAs), to be used.

L2TP can be initiated wherever PPTP or L2F is currently deployed and can be operated as a client initiated tunnel, such as PPTP, or a network access server (NAS) initiated tunnel, such as L2F.

PPP Over Frame Relay

The PPP over Frame Relay feature allows a router to establish end-to-end Point-to-Point Protocol (PPP) sessions over Frame Relay. IP datagrams are transported over the PPP link using RFC 1973 compliant Frame Relay framing. This feature is useful for remote users running PPP to access their Frame Relay corporate networks.

PPP over Frame Relay provides the following benefits:

IETF-Compliant PPP over ATM Scalability (Cisco 4500/4500-M and Cisco  4700/4700-M only)

Point-to-Point Protocol (PPP) over Asynchronous Transfer Mode (ATM) is now available on an ATM CES port adapter in the Cisco 4500/4500-M and Cisco 4700/4700-M.

In previous releases of PPP over ATM, you configured permanent virtual circuits (PVCs) for PPP over ATM on point-to-point subinterfaces. In this release, each PPP over ATM connection no longer requires two interfaces, a virtual access interface and ATM subinterface. Instead, you can configure multiple PVCs for PPP over ATM on multipoint subinterfaces, thereby providing a significant increase in the number of PPP over ATM sessions per router. Also in this release, PPP over ATM is enhanced to support virtual circuit (VC) multiplexed encapsulation and complies with the Internet Engineering Task Force (IETF) draft on multiplexed encapsulation titled PPP over AAL5. The previous version of PPP over ATM supported only the Frame Forwarding data encapsulation (aal5ciscoppp).


Note The IETF PPP over ATM feature does not currently support LLC encapsulated PPP over ATM Adaptation Layer 5 (AAL5).

This release of the PPP over ATM feature provides support for IETF-compliant PPP over ATM and significantly increases the maximum number of PPP over ATM sessions running on a router. The maximum number of PPP over ATM sessions supported on a platform depends on available system resources such as memory and CPU speed.

ATM PVC Trap Support (Cisco 4500/4500-M and Cisco  4700/4700-M only)

The ATM PVC Trap Support feature provides Simple Network Management Protocol (SNMP) notification for permanent virtual circuit (PVC) failures, and it provides SNMP access to PVC status tables.

Normally, a management station is not notified when an Asynchronous Transfer Mode (ATM) PVC goes down. The ATM PVC Trap Support feature enables an agent to send the required PVC traps for this notification. It also provides support for these PVC status tables: atmCurrentlyFailingPVclTable and atmInterfaceExtTable.

CLI String Search

The Command Line Interface (CLI) String Search feature allows you to search or filter any show or more command's output. This is useful when you need to sort though large amounts of output, or if you want to exclude output that you do not need to see. CLI String Search also allows for searching and filtering at --More-- paging prompts.

With the search function, you can begin unfiltered output at the first line that contains a regular expression you specify. You can specify a maximum of one filter per command to either include or exclude output lines that contain the specified regular expression.

A regular expression is any word, phrase, number, etc. that appears in show or more command output.

Cisco IOS STP Enhancements

Cisco IOS Spanning Tree Protocol enhancements broaden the original Cisco IOS STP implementation with increased port identification capability, improved path cost determination, and support for a new VLAN bridge spanning-tree protocol.

Important Notes

This section contains important information about use of your Cisco IOS Release 12.0 T software.

Deprecated MIBs

Older Cisco Management Information Bases (MIBs) will be replaced in a future release. OLD-CISCO-* MIBS are currently being migrated into more scalable MIBs, without affecting existing Cisco IOS products or NMS applications. Application developers should update from deprecated MIBs to the replacement MIBs as shown in the following table.

Deprecated MIB Replacement

OLD-CISCO-APPLETALK-MIB

RFC1243-MIB

OLD-CISCO-CHASSIS-MIB

ENTITY-MIB

OLD-CISCO-CPUK-MIB

In Development

OLD-CISCO-DECNET-MIB

OLD-CISCO-ENV-MIB

CISCO-ENVMON-MIB

OLD-CISCO-FLASH-MIB

CISCO-FLASH-MIB

OLD-CISCO-INTERFACES-MIB

IF-MIB CISCO-QUEUE-MIB

OLD-CISCO-IP-MIB

OLD-CISCO-MEMORY-MIB

CISCO-MEMORY-POOL-MIB

OLD-CISCO-NOVELL-MIB

NOVELL-IPX-MIB

OLD-CISCO-SYS-MIB

(Compilation of other OLD* MIBS)

OLD-CISCO-SYSTEM-MIB

CISCO-CONFIG-COPY-MIB

OLD-CISCO-TCP-MIB

CISCO-TCP-MIB

OLD-CISCO-TS-MIB

OLD-CISCO-VINES-MIB

CISCO-VINES-MIB

OLD-CISCO-XNS-MIB

Caveats

This section contains open and resolved caveats for the current Cisco IOS maintenance release only. For information on caveats in previous maintenance releases, refer to the Caveats for Cisco IOS Release 12.0 T document that accompanies these release notes, and is located on CCO and the Documentation CD-ROM.

Caveats in Cisco IOS Release 12.0(2) also apply to Release 12.0(2)T. For information on caveats in the Cisco IOS Release 12.0(2), refer to the "Caveats" section in the Cross-Platform Release Notes for Cisco IOS Release 12.0 document located on CCO and the Documentation CD-ROM. This section contains caveats affecting all maintenance releases.


Note If you have an account with CCO, you can use Bug Navigator II to find caveats of any severity for any release. Bug Navigator II can be found at http://www.cisco.com/support/bugtools,  or from CCO, select Software & Support: Tools: Bug Toolkit II.

Open Caveats - Release 12.0(2)T

This section describes possibly unexpected behavior by Release 12.0(2)T. This section describes only severity 1 and 2 caveats.

Basic System Services

The [no] atm rmon collect group-num command does not properly take effect when invoked. The ATM-RMON feature (available only on the LS-1010 platform) is fully functional, except when you assign ATM interfaces to ATM-RMON collection groups. In this situation, you must set the associated MIB objects with SNMP. See the portSelTable definitions in the ATM-RMON-MIB.my MIB document for more information. There is no workaround.

IP Routing Protocols

When you use sparse-mode PIM multicast, the multicast tree may take a few minutes to stabilize after the routers are booted. During this period, "PATH" messages sent to multicast addresses are not delivered, and RSVP path and reservation sessions are not established. This is a transient phenomenon that occurs only when the routers are being booted. Once the multicast tree stabilizes, paths and reservations are established quickly. This problem does not occur in unicast or dense-mode multicast networks.
Workaround: Use sparse-dense or dense mode PIM multicast, if possible.

Miscellaneous

The Token Ring Inter-Switch Link (TR-ISL) feature is currently not supported on either the Cisco  3620  router or the Cisco  3640  router. There is no workaround.
If flow-acceleration is enabled, then disabled, and encryption is subsequently enabled, the router may unexpectedly reload.
Workaround: Avoid enabling and then disabling flow-acceleration.
The IP portion of an incoming call might not terminate correctly if the caller closes the connection. This situation is the result of rare timing conditions. There is no workaround.
A Cisco  1600  router or Cisco  3600  series  router will reload when IPSEC is configured over the ISDN link. This condition is caused by the IP route-cache that is enabled by default on all interfaces.
Workaround: turn off fast switching with the no ip route-cache command on the ISDN interfaces.
Description: Cisco  800  series  routers configured for multilink and STAC compression experience a page leak after prolonged usage. This condition is rare (roughly 1 in 50 units experience it) and may take several days to manifest, depending on the number of calls.
Symptoms: Performance degrades until the unit thrashes; that is, the router runs so slowly that no useful work is accomplished. This is accompanied by continuous and heavy blinking of the OK LED.
Workaround: Disable multilink or disable STAC compression. A soft or hard reset (for example, reload command or power cycle) is the only way to clear the problem once it occurs.

Novell IPX, XNS, and Apollo Domain

IPX allows the primary interface and multiple ISL subinterfaces to have the same IPX network number and encapsulation.
Workaround: Do not configure interfaces with the same IPX network number.

Wide-Area Networking

A Cisco router might fail to reply to an Address Resolution Protocol (ARP) incoming on the Bridged Virtual Interface (BVI) when the ARP table is clean. The following error message appears if "debug arp" is turned on: "00:50:23: IP ARP req filtered src 10.1.1.254 0000.0c32.ed77, dst 10.1.1.1 0000.0000.0000 wrong cable, interface Virtual-Access."
Workaround: To install the ARP entries, initiate traffic from the router and force an incoming ARP BVI reply.
Removing a dialer interface while a call is up can result in the loss of use of one B channel.
Workaround: A reload of the router will bring the B channel back.

Resolved Caveats-Release 12.0(2)T

All the caveats listed in this section are resolved in Release 12.0(2)T. This section describes only severity 1 and 2 caveats.

IP Routing Protocols

On some platforms, for example the Cisco  7200  series  routers, RIP does not get enabled on Token Ring interfaces. The output of the sh ip proto command will indicate "Reset all is OK."
Workaround: Configure router rip on the router before configuring the address on the interface. A shut command followed by a no shut command might also bring up RIP on the interface.

Miscellaneous

RADIUS accounting does not work if you have separate authentication and accounting servers.
An IP client might not be able to ping the Route Switch Module (RSM). This situation might occur during Token Ring virtual LAN (TR VLAN) configuration on the RSM. It is most common when the IP client sends an Address Resolution Protocol (ARP) without a routing information field (RIF), and then sends an ARP with a RIF. The situation might also occur if the concentrator relay function (CRF) to which the client is connected is configured for source-route bridging (SRB).
Workaround: Change the CRF mode from SRB to source-route transparent (SRT) bridging.

Novell IPX, XNS, and Apollo Domain

The Internetwork Packet Exchange (IPX) input process might run out of stack, causing a system reload or reduced performance. There is no workaround.

Related Documentation

The following sections describe the documentation available for the Cisco  2600 series routers. Typically, these documents consist of hardware installation guides, software installation guides, Cisco IOS configuration and command references, system error messages, and feature modules, which are updates to Cisco IOS documentation. Documentation is available as printed manuals or electronic documents, except for feature modules, which are available online only.

The most up-to-date documentation can be found on the Web via Cisco  Connection Online (CCO)  and the Documentation CD-ROM.  These electronic documents might contain updates and modifications made after the hard copy documents were printed.

These release notes should be used in conjunction with the documents listed in the following sections:

Release-Specific Documents

The following documents are specific to Release  12.0 T. They are located on CCO and the Documentation CD-ROM:

To access the cross-platform Release Notes for Cisco IOS Release 12.0 T on CCO, follow this path:
Software and Support: Cisco Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Release Notes: Cross-Platform Release Notes for Cisco IOS Release  12.0  T
To access the cross-platform Release Notes for Cisco IOS Release 12.0 on the Documentation CD-ROM, follow this path:
Cisco IOS Software Configuration: Cisco IOS Release 12.0: Release Notes: Cross-Platform Release Notes for Cisco IOS Release 12.0 T
To access these documents, refer to the Software Center at this path on CCO:
Software & Support: Software Center: Cisco IOS Software
As a supplement to the caveats listed in the "Caveats" section in these release notes, see the Caveats for Cisco IOS Release 12.0 T document, which contains caveats applicable to all platforms for all maintenance releases of Release 12.0 T.
To access the caveat document on CCO, follow this path:
Products and Ordering: Cisco Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Caveats: Caveats for Cisco IOS Release 12.0 T
To access the caveat document on the Documentation CD-ROM, follow this path:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS 12.0: Caveats: Caveats for Cisco IOS Release 12.0 T

Platform-Specific Documents

The documents listed below are available for the Cisco  4000 series routers. These documents are also available online at Cisco  Connection Online (CCO)  and on the Documentation CD-ROM.

To access Cisco 4000 series documentation on CCO, follow this path:

Products and Ordering: Cisco Documentation: Access Servers and Access Routers: Modular Access Routers: Cisco 4000 Series Routers

To access Cisco 4000 series documentation on the Documentation CD-ROM, follow this path:

Access Servers and Access Routers: Modular Access Routers: Cisco 4000 Series Routers

Feature Modules

Feature modules describe new features supported by Release 12.0 T and are an update to the Cisco  IOS documentation set. They consist of a brief overview of the feature, benefits, configuration tasks, and a command reference. As updates, the features modules are available online only. The feature module information is included in the next printing of the Cisco IOS documentation set.

To access the feature modules on CCO, follow this path:

Products and Ordering: Cisco Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: New Feature Documentation: New Features in Release 12.0 T

To access the feature modules on the Documentation CD-ROM, follow this path:

Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: New Feature Documentation: New Features in Release 12.0 T

Cisco IOS Software Document Set

The Cisco IOS software documentation set consists of the Cisco  IOS configuration guides, Cisco  IOS command references, and several other supporting documents. These documents are shipped with your order in electronic form on the Documentation CD-ROM, unless you specifically ordered the printed versions.

Documentation Modules

Each module in the Cisco IOS documentation set consists of two books: a configuration guide and a corresponding command reference. Chapters in a configuration guide describe protocols, configuration tasks, and Cisco IOS software functionality and contain comprehensive configuration examples. Chapters in a command reference provide complete command syntax information. Each configuration guide can be used in conjunction with its corresponding command reference.

To access these documents on CCO, follow this path:

Products and Ordering: Cisco Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Cisco IOS Release 12.0 Configuration Guides and Command References

To access these documents on the Documentation CD-ROM, follow this path:

Cisco IOS Software Configuration: Cisco IOS Release 12.0: Cisco IOS Release 12.0 Configuration Guides and Command References

Release 12.0 Documentation Set

Table 8 details the contents of the Cisco  IOS Release 12.0 software documentation set. The document set is available in electronic form, and also in printed form upon request.


Note The most current Cisco IOS documentation can be found on the latest Documentation CD-ROM and on the Web. These electronic documents might contain updates and modifications made after the paper documents were printed.

To access the Cisco IOS documentation set on CCO, follow this path:

Products and Ordering: Cisco Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0

To access the Cisco IOS documentation set on the Documentation CD-ROM, follow this path:

Cisco IOS Software Configuration: Cisco IOS Release 12.0


Table 8: Cisco IOS Software Documentation Set for Release 12.0
Books Chapter Topics

  • Configuration Fundamentals Configuration Guide

  • Configuration Fundamentals Command Reference

Configuration Fundamentals Overview
Cisco IOS User Interfaces
File Management
System Management

  • Bridging and IBM Networking Configuration Guide

  • Bridging and IBM Networking Command Reference

Transparent Bridging
Source-Route Bridging
Token Ring Inter-Switch Link
Remote Source-Route Bridging
DLSw+
STUN and BSTUN
LLC2 and SDLC
IBM Network Media Translation
DSPU and SNA Service Point
SNA Frame Relay Access Support
APPN
Cisco Database Connection
NCIA Client/Server Topologies
Cisco Mainframe Channel Connection
Airline Product Set

  • Dial Solutions Configuration Guide

  • Dial Solutions Command Reference

Dial-In Port Setup
Dial-In Terminal Services
Dial-on-Demand Routing (DDR)
Dial Backup
Dial-Out Modem Pooling
Large-Scale Dial Solutions
Cost-Control Solutions
ISDN
X.25 over ISDN
VPDN
Dial Business Solutions and Examples

  • Cisco IOS Interface Configuration Guide

  • Cisco IOS Interface Command Reference

Interface Configuration Overview

  • Network Protocols Configuration Guide, Part 1

  • Network Protocols Command Reference, Part 1

IP Addressing
IP Services
IP Routing Protocols

  • Network Protocols Configuration Guide, Part 2

  • Network Protocols Command Reference, Part 2

AppleTalk
Novell IPX

  • Network Protocols Configuration Guide, Part 3

  • Network Protocols Command Reference, Part 3

Apollo Domain
Banyan VINES
DECnet
ISO CLNS
XNS

  • Security Configuration Guide

  • Security Command Reference

AAA Security Services
Security Server Protocols
Traffic Filtering and Firewalls
IP Security and Encryption
Passwords and Privileges
Neighbor Router Authentication
IP Security Options

  • Cisco IOS Switching Services Configuration Guide

  • Cisco IOS Switching Services Command Reference

Switching Paths for IP Networks
Virtual LAN (VLAN) Switching and Routing

  • Wide-Area Networking Configuration Guide

  • Wide-Area Networking Command Reference

ATM
Frame Relay
SMDS
X.25 and LAPB

  • Voice, Video, and Home Applications Configuration Guide

  • Voice, Video, and Home Applications Command Reference

Voice over IP
Voice over Frame Relay
Voice over ATM
Voice over HDLC
Video Support
Universal Broadband Features

  • Quality of Service Solutions Configuration Guide1

  • Quality of Service Solutions Command Reference1

Classification
Scheduling
Packet Drop
Traffic Shaping
ATM QoS
SNA QoS
Line Protocols

  • Cisco IOS Software Command Summary

  • Dial Solutions Quick Configuration Guide

  • System Error Messages

  • Debug Command Reference

1This book will not be available until January 1999.

Service and Support

For service and support for a product purchased from a reseller, contact the reseller. Resellers offer a wide variety of Cisco  service and support programs, which are described in the section "Service and Support" in the information packet that shipped with your product.


Note If you purchased your product from a reseller, you can access CCO as a guest. CCO is Cisco  Systems' primary real-time support channel. Your reseller offers programs that include direct access to CCO services.

For service and support for a product purchased directly from Cisco, use CCO.

Software Configuration Tips on the Cisco TAC Home Page

For helpful tips on configuring Cisco products, follow this path on CCO:

Software & Support: Technical Tips (button on left margin)

"Hot Tips" are popular tips and hints gathered from Cisco's Technical Assistance Center (TAC). Most of these documents are also available from the TAC's Fax-on-Demand service. To access Fax-on-Demand and receive documents at your fax machine, call 888-50-CISCO (888-502-4726). From international areas, call 650-596-4408.

The following sections are provided from the Technical Tips page:

Cisco Connection Online

Cisco Connection Online (CCO) is Cisco Systems' primary, real-time support channel. Maintenance customers and partners can self-register on CCO to obtain additional information and services.

Available 24 hours a day, 7 days a week, CCO provides a wealth of standard and value-added services to Cisco's customers and business partners. CCO services include product information, product documentation, software updates, release notes, technical tips, the Bug Navigator, configuration notes, brochures, descriptions of service offerings, and download access to public and authorized files.

CCO serves a wide variety of users through two interfaces that are updated and enhanced simultaneously: a character-based version and a multimedia version that resides on the World Wide Web (WWW). The character-based CCO supports Zmodem, Kermit, Xmodem, FTP, and Internet e-mail, and it is excellent for quick access to information over lower bandwidths. The WWW version of CCO provides richly formatted documents with photographs, figures, graphics, and video, as well as hyperlinks to related information.

You can access CCO in the following ways:

For a copy of CCO's Frequently Asked Questions (FAQ), contact cco-help@cisco.com. For additional information, contact cco-team@cisco.com.


Note If you are a network administrator and need personal technical assistance with a Cisco product that is under warranty or covered by a maintenance contract, contact Cisco's Technical Assistance Center (TAC) at 800  553-2447, 408  526-7209, or tac@cisco.com. To obtain general information about Cisco Systems, Cisco products, or upgrades, contact 800  553-6387, 408  526-7208, or cs-rep@cisco.com.

Documentation CD-ROM

Cisco documentation and additional literature are available in a CD-ROM package, which ships with your product. The Documentation CD-ROM, a member of the Cisco Connection Family, is updated monthly. Therefore, it might be more current than printed documentation. To order additional copies of the Documentation CD-ROM, contact your local sales representative or call customer service. The CD-ROM package is available as a single package or as an annual subscription. You can also access Cisco documentation on the World Wide Web at http://www.cisco.com, http://www-china.cisco.com, or http://www-europe.cisco.com.

If you are reading Cisco product documentation on the World Wide Web, you can submit comments electronically. Click Feedback in the toolbar and select Documentation. After you complete the form, click Submit to send it to Cisco. We appreciate your comments.



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