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Release Notes for Cisco  2600 Series for Cisco  IOS Release  12.0(2)XC

Release Notes for Cisco  2600 Series for Cisco  IOS Release  12.0(2)XC

January 7, 1999

These release notes describe new features for the Cisco  2600 series routers that support Cisco  IOS Release  12.0(2)XC. Cisco  IOS Release  12.0(2)XC is based on Cisco  IOS Release  12.0(2)T.

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)XC, refer to the "Caveats" section.

Contents

These release notes discuss the following topics:

Introduction

This section provides information about the Cisco 2600 series routers and Early Deployment Releases (ED) for the Cisco 2600 series routers.

Cisco 2600 Series Routers

Cisco Systems extends enterprise-class versatility, integration, and power to branch offices with the Cisco 2600 series modular access router family. The Cisco 2600 series routers are cost-effective, modular access routers designed to enable customers to easily adopt future technologies and scale to accommodate network expansion, thereby protecting the customer's investment. The Cisco 2600 series shares modular interfaces with the Cisco 1600, Cisco 1700, and Cisco 3600 series, providing a cost-effective solution to meet today's branch office needs for applications such as:

The Cisco 2600 series modular architecture provides the versatility needed to adapt to changes in network technology as new services and applications become available. Driven by a powerful reduced instruction set computer (RISC) processor, the Cisco 2600 series supports the advanced Quality of Service (QoS), security, and network integration features required in today's evolving enterprise networks.

Early Deployment Releases

This release note document is based on Cisco IOS Release 12.0(2)T. Release 12.0 T is an Early Deployment (ED) release, delivering fixes to software caveats and support for new Cisco hardware. Use the information in this section to determine which early deployment release you require.

The following table briefly describes some of the ED releases available now and soon to be available for the Cisco 2600 series.


Table 1: Early Deployment Releases for the Cisco 2600 Series
ED Release Maintenance Release Additional Software Features Additional Hardware Features Additional Feature Sets Availability

Release 12.0 T

2

---

---

  • IP/FW

  • IP/FW Plus IPSec 56

  • IP/IPX/AT/DEC/FW Plus

  • Enterprise F/W IPSec 56

Now

Release 12.0 XC

2

---

  • Cisco 2620 and Cisco  2621 with Fast Ethernet

  • 1- or 2-port 10/100 Ethernet for the Cisco  2620 and Cisco  2621

  • IP/FW

  • IP/FW Plus IPSec 56

  • IP/IPX/AT/DEC/FW Plus

  • Enterprise F/W IPSec 56

Now

Release 12.0 XD

2

---

  • ISDN BRI VoIP Voice Interface Card

  • IP/FW Plus IPSec 56

  • IP/IPX/AT/DEC/FW Plus

  • Enterprise F/W IPSec 56

Now

Release 11.3 T

7

---

---

---

Now

System Requirements

This section describes the system requirements for Release 12.0(2)XC and includes the following subsections:

Memory Requirements

Table 2 describes the memory requirements of the Cisco  IOS feature sets for the Cisco  2600 series for Release  12.0(2)XC. All "Plus" feature sets include voice network support.


Table 2: Memory Requirements for the Cisco  2600 Series
Feature Set by Platform Image Name Required
Flash
Memory
Required
DRAM
Memory
Runs
From

IP

c2600-i-mz

4 MB

20 MB

RAM

IP Plus

c2600-is-mz

8 MB

24 MB

RAM

IP Plus 40

c2600-is40-mz

8 MB

24 MB

RAM

IP Plus 56

c2600-is56-mz

8 MB

24 MB

RAM

IP Plus IPsec 56

c2600-is56i-mz

8 MB

24 MB

RAM

IP/FW

c2600-io-mz

4 MB

20 MB

RAM

IP/IPX/AT/DEC

c2600-d-mz

8 MB

20 MB

RAM

IP/IPX/AT/DEC Plus

c2600-ds-mz

8 MB

24 MB

RAM

IP/IPX/AT/DEC/FW Plus

c2600-dos-mz

8 MB

24 MB

RAM

IP IPsec 3DES

c2600-ik2s-mz

8 M

24 MB

RAM

IP/FW IPsec 3DES

c2600-ik2os-mz

8 MB

24 MB

RAM

IP/FW Plus IPsec 56

c2600-ios56i-mz

8 MB

24 MB

RAM

Enterprise Plus

c2600-js-mz

8 MB

32 MB

RAM

Enterprise Plus 40

c2600-js40-mz

8 MB

32 MB

RAM

Enterprise Plus 56

c2600-js56-mz

8 MB

32 MB

RAM

Enterprise Plus IPsec 56

c2600-js56i-mz

8 MB

32 MB

RAM

Enterprise/APPN Plus

c2600-ajs-mz

8 MB

32 MB

RAM

Enterprise/APPN Plus 40

c2600-ajs40-mz

8 MB

32 MB

RAM

Enterprise/APPN Plus 56

c2600-ajs56-mz

8 MB

32 MB

RAM

Enterprise/APPN IPsec 3DES

c2600-ajk2s-mz

8 MB

32 MB

RAM

Enterprise/APPN Plus IPsec 56

c2600-ajs56i-mz

8 MB

32 MB

RAM

Remote Access Server

c2600-c-mz

4 MB

20 MB

RAM

Hardware Supported

Cisco IOS Release 12.0 supports the following Cisco  2600 series routers:


Note The Cisco 2620 and Cisco 2621 routers are only available with Cisco IOS Release  12.0(2)XC and later. For more information, refer to the "Early Deployment Releases" section.

For detailed descriptions of the new hardware features for Release 12.0, refer to the cross-platform Release Notes for Cisco IOS Release 12.0  T.   Table 3 lists the interfaces supported by the Cisco 2600 series.


Table 3: Supported Interfaces on the Cisco  2600 Series
Interface, Network Module, or Data Rate1 Platforms Supported
LAN Interfaces

Ethernet (10BaseT), 1- or 2-port

Cisco  2610, Cisco  2611, Cisco  2612

Token Ring (RJ-45), 1-port

Cisco  2612, Cisco  2613

10/100 Ethernet, 1-or 2-port

Cisco 2620 and Cisco 2621

LAN Network Modules

Ethernet, 4-port

All Cisco  2600 series platforms

Ethernet, 1-port

All Cisco  2600 series platforms

ATM-25 RJ-45 interface, 1-port

All Cisco  2600 series platforms

Serial Network Modules

Asynchronous, 16- or 32-port

All Cisco  2600 series platforms

Asynchronous/Synchronous Serial low speed
(128 kbps max), 4- or 8-port

All Cisco  2600 series platforms

Dial, ISDN and Channelized Serial Network Modules

Channelized T1/ISDN PRI, 1- or 2-port

All Cisco  2600 series platforms

Channelized T1/ISDN PRI with CSU, 1- or 2-port

All Cisco  2600 series platforms

Channelized E1/ISDN PRI balanced, 1- or 2-port

All Cisco  2600 series platforms

Channelized E1/ISDN PRI unbalanced, 1- or 2-port

All Cisco  2600 series platforms

ISDN BRI S/T interface, 4-or 8-port

All Cisco  2600 series platforms

ISDN BRI U (NT1) interface, 4- or 8-port

All Cisco  2600 series platforms

Analog Modems, 8 or 16

All Cisco  2600 series platforms

Voice/Fax Network Module

Voice /Fax, 1 or 2 Voice Interface Card Slots

All Cisco  2600 series platforms

WAN Interface Cards and Voice Interface Cards

ISDN BRI S/T interface (requires external NT1), 1-port

All Cisco  2600 series platforms

ISDN BRI (NT1) U, 1-port

All Cisco  2600 series platforms

56/64-kbps DSU/CSU, 1-port

All Cisco  2600 series platforms

T1/Fractional T1 with DSU/CSU, 1-port

All Cisco  2600 series platforms

High-Speed Serial (up to 2.048 Mbps), 1-port

All Cisco  2600 series platforms

Dual High-speed Serial (up to 2.048 Mbps; asynchronous/synchronous support), 2-port

All Cisco  2600 series platforms

Asynchronous/Synchronous (up to 128 kbps), 2-port

All Cisco  2600 series platforms

FXS Voice/Fax interface card for Voice/Fax network module, 2-port2

All Cisco  2600 series platforms with Voice/Fax network module

FXO Voice/Fax interface card for Voice/Fax network module, 2-port2

All Cisco  2600 series platforms with Voice/Fax network module

E&M Voice/Fax interface card for Voice/Fax network module, 2-port2

All Cisco  2600 series platforms with Voice/Fax network module

Advanced Integration Modules

Data Compression AIM (up to 8.192Mbps)

All Cisco  2600 series platforms

1The Voice/Fax and ATM-25 network modules require Cisco IOS Plus feature sets.
2This interface card requires the NM-1V or NM-2V network module.


Note The 1- or 2-port 10/100 Ethernet LAN interface for the Cisco 2621 and Cisco 2621 routers is only available in Release 12.0(2)XC and later. The ISDN BRI VoIP Voice Interface Card is only available in Release 12.0(2)XD and later. For more information, refer to the "Early Deployment Releases" section.

Determining Your Software Release

To determine the version of Cisco IOS software currently running on a Cisco  2600 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) 2600 Software (c2600-i-mz), Version 12.0(2)XC, RELEASE SOFTWARE
 

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

Upgrading to a New Release

For 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 & Ordering: More Information: Product Bulletins. Scroll to Software. Under Cisco IOS 12.0, click the Upgrade Paths bulletin.

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 (Table 4) shows the feature set organization and lists which feature sets are available on the Cisco 2600 series for Release  12.0(2)XC. Table 4 lists the feature set name, the feature set matrix term, the software image name, and the supported platforms.


Table 4: Feature Sets Supported by the Cisco  2600 Series
Feature Sets Feature Set Matrix Term Software Image Platforms
IP Standard
Feature Sets

IP

Basic1

c2600-i-mz

All Cisco  2600 series platforms

IP Plus

Basic, Plus2

c2600-is-mz

All Cisco  2600 series platforms

IP Plus 40

Plus, Plus  403

c2600-is40-mz

All Cisco  2600 series platforms

IP Plus 56

Plus, Plus  564

c2600-is56-mz

All Cisco  2600 series platforms

IP Plus IPsec 56

Plus, Plus  IPsec  565

c2600-is56i-mz

All Cisco  2600 series platforms

IP/IPX/AppleTalk/
DEC
Standard
Feature Sets

IP/IPX/AppleTalk/
DEC

Basic

c2600-d-mz

All Cisco  2600 series platforms

IP/IPX/AppleTalk/
DEC Plus

Basic, Plus

c2600-ds-mz

All Cisco  2600 series platforms

Enterprise Standard
Feature Sets

Enterprise Plus

Plus

c2600-js-mz

All Cisco  2600 series platforms

Enterprise Plus 40

Plus, Plus  40

c2600-js40-mz

All Cisco  2600 series platforms

Enterprise Plus 56

Plus, Plus  56

c2600-js56-mz

All Cisco  2600 series platforms

Enterprise Plus IPsec 56

Plus, Plus  IPsec  56

c2600-j56i-mz

All Cisco  2600 series platforms

Enterprise/APPN Standard
Feature Sets

Enterprise/APPN Plus

Plus

c2600-ajs-mz

All Cisco  2600 series platforms

Enterprise/APPN Plus 40

Plus, Plus  40

c2600-ajs40-mz

All Cisco  2600 series platforms

Enterprise/APPN Plus 56

Plus, Plus  56

c2600-ajs56-mz

All Cisco  2600 series platforms

Enterprise/APPN Plus IPsec 56

Plus, Plus IPSec 56

c2600-ajs56i-mz

All Cisco  2600 series platforms

Remote Access Server Feature Set

Remote Access Server

Basic

c2600-c-mz

All Cisco  2600 series platforms

1This feature is offered in the Basic feature set.
2This feature is offered in the Plus feature set.
3This feature is offered in the encryption feature sets which consist of 40-bit (Plus 40) data encryption feature sets.
4This feature is offered in the encryption feature sets which consist of 56-bit (Plus 56) data encryption feature sets.
5This feature is offered in the encryption feature sets which consist of IPsec 56-bit (Plus IPsec 56) 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 5 and Table 6 list the features and feature sets supported by the Cisco 2600 series in Cisco IOS Release 12.0(2)XC. Both tables use the following conventions to identify features:


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


Table 5: Feature List by Feature Set for the Cisco 2600 Series --- Part 1 of 2
Feature Sets
Features IP IP PLUS IP PLUS 40 IP PLUS 56 IP PLUS IPSEC 56 IP/IPX/AT/DEC IP/IPX/AT/DEC PLUS
IBM Support
Bridging Code Rework

Yes

Yes

Yes

Yes

Yes

Yes

Yes

RIF Passthru in DLSw+

No

Yes

Yes

Yes

Yes

No

Yes

IP Routing
IP Precedence for GRE Tunnels
(GRE VPN)

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Protocol-
Independent Multicast (PIM) Version 2

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Management
SNMP Inform Request

No

No

No

No

No

No

No

VPDN MIB and Syslog Facility

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Scalability
Airline Product Set (ALPS)

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Cisco IOS File System

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Entity MIB

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Expression MIB

Yes

Yes

Yes

Yes

Yes

Yes

Yes

OSPF Point to Multipoint

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Per Port Debugging (Conditionally Triggered Debugging)

Yes

Yes

Yes

Yes

Yes

Yes

Yes

SNMP Manager

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Security
Additional Vendor-
Proprietary RADIUS Attributes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Authenticating ACLs

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Automated Double Authentication

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Certificate Authority Interoperability

No

No

No

No

Yes

No

No

Internet Key Exchange Security Protocol

Yes

Yes

No

No

No

No

No

IPSec Network Security

No

No

No

No

Yes

No

No

MS-CHAP Support

No

No

No

No

No

No

No

Security (continued)
Named Method Lists for AAA Authentication & Accounting

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Subblock Phase 1

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Switching
Enhanced ATM VC Configuration and Management

Yes

No

No

No

No

Yes

Yes

Multiple ISDN Switch Types

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Voice/Multimedia
VoIP/Symphony

No

No

No

No

No

No

Yes

WAN Optimization
ATM PVC Management

Yes

Yes

Yes

Yes

Yes

No

Yes

DRP Server Agent

Yes

Yes

Yes

Yes

Yes

Yes

Yes

WAN Services
Always On/Dynamic ISDN (AO/DI)

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Dialer Watch

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Interface Name Modularity

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Microsoft Point-to-Point Compression (MPPC)

Yes

Yes

Yes

Yes

Yes

Yes

Yes

MS Callback

Yes

Yes

Yes

Yes

Yes

Yes

Yes

National ISDN Switch Types

Yes

Yes

Yes

Yes

Yes

Yes

Yes

New and Changed Show Commands for the Cisco 2600 Series Routers

Yes

Yes

No

No

No

Yes

Yes

Stackable Home Gateway

No

Yes

Yes

Yes

Yes

No

Yes

`

Table 6: Feature List by Feature Set --- Part 2 of 2
Feature Sets
Features ENTER-
PRISE
PLUS
ENTER-
PRISE
PLUS 40
ENTER-
PRISE
PLUS 56
ENTER-
PRISE
PLUS
IPSEC
56
ENTER-
PRISE/
APPN
PLUS
ENTER-
PRISE/
APPN
PLUS 40
ENTER-
PRISE/
APPN
PLUS 56
ENTER-
PRISE/
APPN
PLUS
IPSEC
56
Remote Access Server
IBM Support
Bridging Code Rework

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

RIF Passthru in DLSw+

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

IP Routing
IP Type of Service Precedence for GRE Tunnels
(GRE VPN)

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Protocol-
Independent Multicast (PIM) Version 2

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Management
SNMP Inform Request

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

VPDN MIB and Syslog Facility

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Scalability
Airline Product Set (ALPS)

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

Cisco IOS File System

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Entity MIB

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Expression MIB

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

OSPF Point to Multipoint

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Per Port Debugging (Cond Triggered Debugging)

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

SNMP Manager

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Security
Additional Vendor-
Proprietary RADIUS Attributes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Authenticating ACLs

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

Security (continued)
Automated Double Authentication

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Certificate Authority Interoperability

No

No

No

Yes

No

No

No

Yes

No

Internet Key Exchange Security Protocol

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

IPSec Network Security

No

No

No

Yes

No

No

No

Yes

No

MS-CHAP Support

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

Named Method Lists for AAA Authentication & Accounting

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Subblock Phase 1

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Switching
Multiple ISDN Switch Types

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

National ISDN Switch Types

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Voice/Multimedia
Voice over IP

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

WAN Optimization
ATM PVC Management

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

DRP Server Agent

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

WAN Services
Always On/Dynamic ISDN (AO/DI)

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Dialer Watch

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Interface Name Modularity

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Microsoft Point-to-Point Compression (MPPC)

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

WAN Services (continued)
MS Callback

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

New and Changed Show Commands for the Cisco 2600 Series Routers

No

No

No

No

Yes

Yes

Yes

Yes

Yes

Stackable Home Gateway

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

New and Changed Information

This section lists some of the features available for the Cisco 2600 series in Cisco IOS Release 12.0(2)XC software. 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), the Documentation CD-ROM.


Note The ISDN BRI VoIP Voice Interface Card is only available in Release 12.0(2)XC and later. For more information, refer to the "Early Deployment Releases" section.

Important Notes

This section contains important information about use of your Cisco IOS Release 12.0(2)XC 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 table below.

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 the Cisco IOS Release 12.0  T, refer to the "Caveats" section in the cross-platform Release Notes for Cisco IOS Release 12.0  T  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)XC

This section describes possibly unexpected behavior by Release 12.0(2)XC. Unless otherwise noted, these caveats apply to all 12.0 releases up to and including 12.0(2)XC.

Basic System Services

The [no] atm rmon collect group-num does not properly take effect when invoked. The ATM-RMON feature (available only on the LS-1010 platform) is fully functional, except the assignment of ATM interfaces to ATM-RMON collection groups must be done by setting the associated MIB objects with SNMP. See the portSelTable definitions in the ATM-RMON-MIB.my MIB document for more information.
There might be an issue with a second call being placed to a station that is currently in call_setup or connected. This only appears where the call is being forwarded via an intermediate router.

IP Routing Protocols

When using sparse-mode PIM multicast, it might take up to five minutes from boot up of the routers until the multicast tree stabilizes. During this period, PATH messages sent to multicast addresses will not be delivered, and hence RSVP path and reservation sessions will not be established. This is a transient phenomenon which occurs only when the routers are being booted. Once the multicast tree stabilizes, paths/reservations are established quickly.
This problem does not occur in unicast or dense-mode multicast networks.

Miscellaneous

The Token-Ring Inter-Switch Link (TR-ISL) feature is currently not supported on either the Cisco 3620 or Cisco 3640. There is no workaround.
If flow-acceleration is enabled and subsequently disabled and if encryption is also subsequently enabled, the router might unexpectedly reload.
Under rare circumstances, if an incoming call is terminated by the caller, the IP portion of the call might not be terminated correctly. This only occurs under very specific timing conditions.
ALPS UTS serial encapsulation could not be configured.
Cisco 800 routers can experience a page leak after prolonged usage. This condition is rare (roughly 1 in 50 units experience it) and might take several days to manifest, depending on the number of calls.
When this problem occurs, performance degrades until the unit thrashes (for example, runs so slow that no useful work is accomplished). This is accompanied by continuous and heavy blinking of the OK LED.
Disabling multilink and STAC compression might reduce or eliminate the leak. A soft or hard reset (for example, using the reload or power-cycle command) is the only way to clear the problem when it occurs.
To cause a leak, the router must allocate a large block of memory, read from that memory, deallocate the block, allocate another large block, and write to it without reading from it. The alloc/read/free case (without any intervening writes) is very rare and typically only occurs during call setup failure with multilink (MLPPP) and/or compression configured.

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: Don't configure interfaces with the same IPX network number.

Wide-Area Networking

ARP replies out a bridged PPP over ATM with IRB interface will fail to be sent. To intall the ARP entries, initiate traffic from the router and force an incoming ARP reply.
Removing a dialer interface while a call is up can result in the loss of use of one B channel. A reload of the router will bring it back.

Resolved Caveats - Release 12.0 T

All the caveats listed in this section are resolved in release 12.0(2)T.

Security Problem

If a User Datagram Protocol (UDP) packet with an invalid length is sent to port 514 (the "syslog" port) on an IOS device, the device is likely to reload. In this situation, a stack trace might not be saved. Such packets are sent by the popular nmap port scanning program.
Workaround:
You can work around this vulnerability by preventing any affected Cisco IOS device from receiving or processing UDP datagrams addressed to its port 514. This can be done either using packet filtering on surrounding devices, or by using input access list filtering on the affected IOS device itself.
If you use an input access list, that list should be applied to all interfaces to which attackers may be able to send datagrams. This includes not only physical LAN and WAN interfaces, but virtual subinterfaces of those physical interfaces, as well as virtual interfaces and/or interface templates corresponding to GRE, L2TP, L2F, and other tunnelling protocols.
The input access list must block traffic destined for any of the Cisco IOS device's own IP addresses, as well as for any broadcast or multicast addresses on which the Cisco IOS device may be listening. It's important to remember to block old-style "all-zeroes" broadcasts as well as new-style "all-ones" broadcasts.
There is no single input access list that will work in all configurations. It is very important that you understand the effect of your access list in your specific configuration before you activate the list.
The following example shows a possible access list for a three-interface router, along with the configuration commands needed to apply that access list. The example assumes no need for input filtering other than as a workaround for this vulnerability.
! Deny all multicasts, and all unspecified-net broadcasts, to port 514 
      access-list 101 deny udp any 224.0.0.0 31.255.255.255 eq 514 
      ! Deny old-style unspecified-net broadcasts 
      access-list 101 deny udp any host 0.0.0.0 eq 514 
      ! Deny network-specific broadcasts. This example assumes that all of 
      ! the local interfaces are on the class B network 172.16.0.0, subnetted 
      ! everywhere with mask 255.255.255.0. This will differ from network 
      ! to network. Note that we block both new-style and old-style broadcasts. 
      access-list 101 deny udp any 172.16.0.255 0.0.255.0 eq 514 
      access-list 101 deny udp any 172.16.0.0   0.0.255.0 eq 514 
      ! Deny packets sent to the addresses of our own network interfaces. 
      access-list 101 deny udp any host 172.16.1.1 eq 514 
      access-list 101 deny udp any host 172.16.2.1 eq 514 
      access-list 101 deny udp any host 172.16.3.3 eq 514 
      ! Permit all other traffic (default would be to deny) 
      access-list 101 permit ip any any 
 
      ! Apply the access list to the input side of each interface 
      interface ethernet 0 
      ip address 172.16.1.1 255.255.255.0 
      ip access-group 101 in 
 
      interface ethernet 2 
      ip address 172.16.2.1 255.255.255.0 
      ip access-group 101 in 
 
      interface ethernet 3 
      ip address 172.16.3.3 255.255.255.0 
      ip access-group 101 in 

It can be complicated to list all possible addresses, and especially all possible broadcast addresses, to which attack packets might be sent. If you do not expect to receive any legitimate syslog traffic on an interface, you may wish to simply block all syslog traffic arriving on that interface. Remember that this will affect traffic routed through the Cisco IOS device as well as traffic destined to the device.
Input access lists have an impact on system performance, and should be installed with a degree of caution, especially on systems that are running very near their capacity limits.

IP Routing Protocols

Workaround:
The workaround is to configure "router rip" on the router first, before configuring the address 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), 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 the 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 these sections:

Release-Specific Documents

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

To navigate to Release Notes for Cisco IOS Release 12.0, follow this path on CCO  or the Documentation CD-ROM:  
Products & Ordering: Cisco Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Release Notes
To navigate to the Software Center, follow this path on CCO:
Software & Support: Software Center

Platform-Specific Documents

The following documents are specific to the Cisco 2600 series and are available online at Cisco  Connection Online (CCO)  and on the Documentation CD-ROM:

To access platform documents on CCO, follow this path:

Products & Ordering: Cisco Documentation: Access Servers and Access Routers: Modular Access Routers: Cisco 2600 Series Routers

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

Cisco Product Documentation: Access Servers & Access Routers: Modular Access Routers: Cisco 2600 Series Routers

Feature Modules

Feature modules describe new features supported by Release 12.0(2)XC and 12.0(2)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 & 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 & Ordering: Cisco Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Configuration Guides & Command References: Cisco IOS Interface Configuration Guide or Cisco IOS Interface Command Reference

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

Cisco IOS Software Configuration: Cisco IOS Release 12.0: Configuration Guides & Command References: Cisco IOS Interface Configuration Guide or Cisco IOS Interface Command Reference

Release 12.0 Documentation Set

Table 7 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 & 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 7: 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 is available in January 1999.


Note The Cisco Management Information Base (MIB) User Quick Reference publication is no longer being published. For the latest list of MIBs supported by Cisco, see the Cisco Network Management Toolkit on Cisco Connection Online. On CCO, use the following path: Software & Support: Software Center: Network Management Products: Cisco Network Management Toolkit: Cisco MIBs.

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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