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Configuring Token Ring
Inter-Switch Link

INDEX fIGURE shows PX source-routed d

Configuring Token Ring
Inter-Switch Link

This chapter explains how to configure Token Ring Inter-Switch Link (TRISL) on Cisco routers. The chapter describes TRISL in the context of the Inter-Switch Link (ISL) protocol and the Token Ring  VLAN concept.

For a complete description of the Token Ring Inter-Switch Link commands in this chapter, refer to the "Token Ring Inter-Switch Link Commands" chapter in the Bridging and IBM Networking Command Reference. To locate documentation of other commands that appear in this chapter, use the command reference master index or search online. For information on how Token Ring VLANs are implemented on switches, refer to the Catalyst Token Ring Switching Implementation Guide, the Catalyst 5000 Series Token Ring Configuration Notes, the Catalyst 3900 Token Ring Switching User Guide, and the Catalyst 3920 Token Ring Switching User Guide.

Cisco's TRISL Implementation

This section contains information related to Cisco's implementation of TRISL that you should understand before you proceed to the "TRISL Configuration Tasks" section.

ISL and TRISL

Inter-Switch Link (ISL) is a layer 2 protocol that enables switches and routers to transport Ethernet frames from multiple VLANs across Fast Ethernet or Gigabit Ethernet links. Cisco's TRISL protocol extends the ISL model to include the transport of Token Ring frames from multiple VLANS across these same links.

TRISL support on Cisco routers provides inter-VLAN routing and bridging across a 100 Mb Fast Ethernet link. ISL and TRISL together provide routing and bridging between Token Ring and Ethernet LANs, ELANS, and VLANs.

TRISL is supported on Cisco 7500 or Cisco 7200 routers installed with any one of the following port adapters:


Note The two-port Fast Ethernet/ISL port adapters support frame sizes up to 17800 bytes and the one-port Fast Ethernet port adapters support a frame size of up to 1500 bytes.

The TRISL feature provides the following new capabilities and features, which will be described in the "TRISL Configuration Tasks" and "TRISL Configuration Examples" sections later in the chapter:


Note VLAN Trunk Protocol (VTP) is currently not supported for TRISL on the routers.

Token Ring VLANs

A VLAN is essentially a broadcast domain. In transparent bridging, there is only one type of broadcast frame and, therefore, only one level of broadcast domain and one level of VLAN. In source routing, however, there are 2 types of broadcast frames:

Therefore, there are two levels of VLANs in a Token Ring switched network.

The first level is the Token Ring Concentrator Relay Function (TrCRF). At this level, the VLAN is a logical ring and, as such, is assigned a ring number. On a Token Ring switch, the logical ring (TrCRF) contains one or more physical ports. On a router, the logical ring (TrCRF) does not contain any physical ports, but rather is used only in processing source-routed traffic to terminate the RIF.

The second level is the Token Ring Bridge Relay Function (TrBRF). This is the parent VLAN to which TrCRF VLANs are assigned. At this level, the VLAN is a logical bridge and, as such, is assigned a bridge number. The logical bridge (TrBRF) contains the virtual ports that establish a connection between the TrBRF and its TrCRFs. The TrBRF can be extended across a network of switches and routers via ISL, as shown in Figure 71.


Figure 71: Physical View of Switches Interconnected via ISL


When you extend the TrBRF across an ISL link, you are essentially extending the bridge across devices, as shown in Figure 72.


Figure 72: Logical View of Switches Interconnected via ISL


Therefore, if you use source-route bridging between the TrCRFs that belong to the TrBRF, only one hop appears in the Routing Information Field (RIF).

Traffic is switched between the ports in a TrCRF and bridged via SRB or SRT between the TrCRFs in a TrBRF.

Figure 73 illustrates a TrBRF that contains TrCRFs on both a router and a switch.


Figure 73: TrCRFs in a TrBRF

TRISL Configuration Tasks

To configure and monitor TRISL in your network, perform one or more of the following tasks:

Configure IP Routing over TRISL

The IP routing over TRISL VLANs feature extends IP routing capabilities to include support for routing IP frame types in VLAN configurations. To configure IP routing over TRISL, use the following commands, beginning in global configuration mode:  
Step Command Purpose

1 . 

ip routing

Enable IP routing on the router.

2 . 

interface type slot/port.subinterface-number

Specify the subinterface on which TRISL will be used.

3 . 

encapsulation tr-isl trbrf-vlan vlanid bridge-num bridge-number

Define the encapsulation format, and specify the VLAN identifier.

4 . 

ip address ip-address mask

Set a primary IP address for an interface.

You can configure TRISL to route source-routed traffic by enabling the collection and use of RIF information on a TRISL subinterface. This creates a "pseudo-ring" to terminate the RIF path on a ring. Without RIF information, a packet could not be bridged across a source-route bridged network connected to this interface.

To route source-routed traffic, use the following additional commands in interface configuration mode:  
Command Purpose

1 . 

multiring trcrf-vlan vlanid ring ring-number

Create a pseudo-ring to terminate the RIF and assign it to a VLAN.

2 . 

multiring {protocol-keyword [all-routes | spanning | all | other]}

Enable collection and use of RIF information with routed protocols.


Note TRISL encapsulation must be specified for a subinterface before an IP address can be assigned to that subinterface.

Configure Hot Standby Router Protocol over TRISL

The Hot Standby Router Protocol (HSRP) provides fault tolerance and enhanced routing performance for IP networks. HSRP allows Cisco routers to monitor each other's operational status and very quickly assume packet forwarding responsibility in the event the current forwarding device in the HSRP group fails or is taken down for maintenance. The standby mechanism remains transparent to the attached hosts and can be deployed on any LAN type. With multiple hot-standby groups, routers can simultaneously provide redundant backup and perform load-sharing across different IP subsets.

To configure HSRP over TRISL between VLANs, use the following commands in interface configuration mode:
Step Command Purpose

1 . 

interface type slot/port.subinterface-number

Specify the subinterface on which ISL will be used.

2 . 

encapsulation tr-isl trbrf-vlan vlanid bridge-num bridge-number

Define the encapsulation format, and specify the VLAN identifier.

3 . 

ip address ip-address mask [secondary]

Specify the IP address for the subnet on which ISL will be used.

4 . 

standby [group-number] ip [ip-address  [secondary]]

Enable HSRP.

To customize hot standby group attributes, use one or more of the following commands in interface configuration mode:
Command Purpose

standby [group-number] timers hellotime holdtime

Configure the time between hello packets and the hold time before other routers declare the active router to be down.

standby [group-number] priority priority

Set the hot standby priority used to choose the active router.

standby [group-number] preempt

Specify that if the local router has priority over the current active router, the local router should attempt to take its place as the active router.

standby [group-number] track type-number [interface-priority].

Configure the interface to track other interfaces, so that if one of the other interfaces goes down, the hot standby priority for the device is lowered.

standby [group-number] authentication string

Enable the automatic spanning-tree function on a group of bridged interfaces.

Configure IPX Routing over TRISL

The IPX Routing over ISL VLANs feature extends Novell NetWare routing capabilities to include support for routing all standard IPX encapsulations for Token Ring frame types in VLAN configurations. Users with Novell NetWare environments can configure either SAP or SNAP encapsulations to be routed using the TRISL encapsulation across VLAN boundaries.

Netware users can now configure consolidated VLAN routing over a single VLAN trunking interface. With configurable Token Ring encapsulation protocols on a per VLAN basis, users have the flexibility of using VLANs regardless of their NetWare Token Ring encapsulation. Encapsulation types and corresponding framing types are described in the "Configuring Novell IPX" chapter of the Network Protocols Configuration Guide, Part 2.


Note Only one type of IPX encapsulation can be configured per VLAN (subinterface). The IPX encapsulation used must be the same within any particular subnet. A single encapsulation must be used by all NetWare systems that belong to the same LAN.

To configure Cisco IOS software to route IPX on a router with connected VLANs, use the following commands, beginning in global configuration mode:
Step Command Purpose

1 . 

ipx routing [node]

Enable IPX routing globally.

2 . 

interface type slot/port.subinterface-number

Specify the subinterface on which TRISL will be used.

3 . 

encapsulation tr-isl trbrf-vlan vlanid bridge-num bridge-number

Define the encapsulation for TRISL.

4 . 

ipx encapsulation encapsulation type

Specify the IPX encapsulation.

5 . 

ipx network network number

Specify the IPX network.


Note The default IPX encapsulation format for Token Ring in Cisco IOS routers is SAP. Therefore, you only need to explicitly configure the IPX encapsulation type if your Token Ring network requires SNAP encapsulation instead of SAP.

When routing source-routed traffic for specific VLANs, use the following additional commands in interface configuration mode:  
Step Command Purpose

1 . 

multiring trcrf-vlan vlanid trcrf-ring ring-number

Create a pseudo-ring to terminate the RIF and assign it to a VLAN.

2 . 

multiring {protocol-keyword [all-routes | spanning | all | other]}

Enable collection and use of RIF information with routed protocols.

Configure Source-Route Bridging over TRISL

To configure source-route bridging over TRISL, use the following commands, starting in global configuration mode:
Step Command Purpose

1 . 

source-bridge ring-group vring-num

Configure a virtual ring for the router.

2 . 

interface type slot/port.subinterface-number

Specify the subinterface on which TRISL will be used.

3 . 

encapsulation tr-isl trbrf-vlan vlanid bridge-num bridge-number

Define the encapsulation for TRISL.

4 . 

source-bridge trcrf-vlan vlanid ring-group ring-number

Attach a TrCRF VLAN identifier to the router's virtual ring.

Configure Source-Route Transparent Bridging over TRISL

To configure transparent bridging over TRISL, use the following command, starting in global configuration mode:
Step Command Purpose

1 . 

interface type slot/port.subinterface-number

Specify the subinterface on which TRISL will be used.

2 . 

encapsulation tr-isl trbrf-vlan vlanid bridge-num bridge-number

Define the encapsulation for TRISL.

3 . 

bridge-group bridge-group number

Specify the bridge group to which the TRISL sub-interface belongs.

Configure Source-Route Translational Bridging over TRISL

To configure source-route translational bridging over TRISL, use the following commands, starting in global configuration mode:
Step Command Purpose

1 . 

source-bridge ring-group vring-num

Configure a virtual ring for the router.

2 . 

source-bridge transparent ring-group pseudo-ring bridge-number tb-group [oui]

Enable bridging between transparent bridging and source-route bridging.

3 . 

interface type slot/port.subinterface-number

Specify the subinterface on which TRISL will be used.

4 . 

encapsulation tr-isl trbrf-vlan vlanid bridge-num bridge-number

Define the encapsulation for TRISL.

5 . 

source-bridge trcrf-vlan vlanid ring-group ring-number

Assign a VLAN ID to the router's virtual ring.


Note For a complete description of SR/TLB, including configuring translation compatibility with IBM 8209 bridges and configuring Token Ring LLC2 to Ethernet Type II (0x80d5) and Token Ring LLC2 to Ethernet 802.3 LLC2 (standard) translations, please refer to the "Configuring Source-Route Bridging" and "Source-Route Bridging Commands" chapters in the Bridging and IBM Networking Configuration Guide and Bridging and IBM Command Reference.

Configure Automatic Spanning Tree

The automatic spanning-tree function supports automatic resolution of spanning trees in SRB networks, which provides a single path for spanning explorer frames to traverse from a given node in the network to another. Spanning explorer frames have a single-route broadcast indicator set in the routing information field. Port identifiers consist of ring numbers and bridge numbers associated with the ports. The spanning-tree algorithm for SRB does not support Topology Change Notification Bridge Protocol Data Unit (BPDU).

Although the automatic spanning-tree function can be configured with Source-Route Translational Bridging (SR/TLB), the SRB domain and transparent bridging domain have separate spanning trees. Each Token Ring interface can belong to only one spanning tree. Only one bridge group can run the automatic spanning-tree function at a time.

To create a bridge group that runs an automatic spanning-tree function compatible with the IBM SRB spanning-tree implementation, use the following command in global configuration mode:
Command Purpose

bridge bridge-group protocol ibm

Create a bridge group that runs the automatic spanning-tree function.

To enable the automatic spanning-tree function for a specified group of bridged interfaces in SRB or SR/TLB, use the following command in interface configuration mode:
Command Purpose

source-bridge spanning bridge-group

Enable the automatic spanning-tree function on a group of bridged interfaces.

Monitor TRISL Statistics

You can collect, clear, and display statistical information about the network.

The Duplicate Ring Protocol (DRiP) runs on Cisco routers and switches that support switched VLAN networking and is used to identify active Token Ring VLANs (TrCRFs).

DRiP maintains the status of TrCRFs and uses this information to determine whether there are multiple TrCRFs active in a TrBRF.

DRiP information is used for the following:

DRiP information is used in conjunction with the local configuration to determine which of the TrCRFs configured within a TrBRF have active ports. This information is used on the base switch to correctly filter all-routes explorers and on the ISL module to discard AREs that have already been on an attached ring.
DRiP information is used in conjunction with the local configuration information to determine which TrCRFs are already active on the switches. If a TrCRF is enabled on more than one switch or router, the ports associated with the TrCRF are disabled on all switches. A router will not disable the internal ring used for SRB and for routing source-routed traffic. Instead, the router generates the following error message to indicate that two identical TrCRFs exist:
DRIP conflict with CRF <vlan-id>

To show or clear DRiP or VLAN statistics, use one or all the following command in privileged EXEC mode:
Command Purpose

clear drip counters

Clear DRiP counters.

clear vlan statistics

Remove VLAN statistics from any statically configured or system configured entries.

show drip

Display DRiP information.

show vlans

Display a summary of VLAN subinterfaces.


Note When DRiP counters are cleared, the counter is reset to 0. Incrementing of DRiP counters indicates that the router is receiving packets across the TrBRF.

TRISL Configuration Examples

The following sections provide TRISL configuration examples:


Note Because the VLAN Trunk Protocol (VTP) is not supported on the router configured with TRISL, the TrCRF configuration on the router must also be specified in the Catalyst 5000 switch configuration.

IP Routing Non-Source-Routed Frames between a TRISL VLAN and a Token Ring Interface Example

Figure 74 illustrates IP routing between a TRISL VLAN and a Token Ring interface.


Figure 74: IP Routing between a TRISL VLAN and a Token Ring Interface


The following is the configuration for the router:

ip routing
interface TokenRing 3/1
  ip address 4.4.4.1 255.255.255.0
!
interface FastEthernet4/0.1
  ip address 5.5.5.1 255.255.255.0
  encapsulation tr-isl trbrf 999 bridge-num 14

The following is the configuration for the Catalyst 5000 switch with the Token Ring switch module in slot 5. In this configuration, the Token Ring port 1 is assigned to the TrCRF VLAN 40.

#vtp
set vtp domain trisl
set vtp mode server
set vtp v2 enable
#drip
set tokenring reduction enable
set tokenring distrib-crf disable
#vlans
set vlan 999 name trbrf type trbrf bridge 0xe stp ieee
set vlan 40 name trcrf40 type trcrf parent 999 ring 0x1 mode srt
#add token port to trcrf 40
set vlan 40   5/1
set trunk 1/2 on

IP Routing Source-Routed Frames between a TRISL VLAN and a Token Ring Interface Example

Figure 75 illustrates IP routing source-routed frames between a TRISL VLAN and a Token Ring interface.


Figure 75: Routing Source-Routed Frames between a TRISL VLAN and a Token Ring Interface


The following is the configuration for the router:

ip routing
interface TokenRing 3/1
  ip address 4.4.4.1 255.255.255.0
!
interface FastEthernet4/0.1
  ip address 5.5.5.1 255.255.255.0
  encapsulation tr-isl trbrf 999 bridge-num 14
  multiring trcrf-vlan 200 ring 100
  multiring all

The following is the configuration for the Catalyst 5000 switch with the Token Ring switch module in slot 5. In this configuration, the Token Ring port 5/1 is assigned to the TrCRF VLAN 40.

#vtp
set vtp domain trisl
set vtp mode server
set vtp v2 enable
#drip
set tokenring reduction enable
set tokenring distrib-crf disable
#vlans
set vlan 999 name trbrf type trbrf bridge 0xe stp ibm
set vlan 200 name trcrf200 type trcrf parent 999 ring 0x64 mode srb
set vlan 40 name trcrf40 type trcrf parent 999 ring 0x1 mode srb
#add token port to trcrf 40
set vlan 40   5/1
set trunk 1/2 on

IP Routing Source-Route Frames between a TRISL VLAN and an Ethernet ISL VLAN Example

Figure 76 illustrates IP routing source-route frames between a TRISL VLAN and an Ethernet ISL VLAN.


Figure 76: IP Routing Source-Routed Frames between a TRISL VLAN and an Ethernet ISL VLAN


The following is the configuration for the router:

interface FastEthernet4/0.1
  ip address 5.5.5.1 255.255.255.0
  encapsulation tr-isl trbrf-vlan 999 bridge-num 14
  multiring trcrf-vlan 200 ring 100
  multiring all
!
interface FastEthernet4/0.2
  ip address 4.4.4.1 255.255.255.0
  encapsulation isl 12

The following is the configuration for the Catalyst 5000 switch with the Ethernet module in slot 2 and a Token Ring switch module in slot 5. In this configuration, the Token Ring port is assigned with TrCRF VLAN 100 and the Ethernet port is assigned with VLAN 12.

#vtp
set vtp domain trisl
set vtp mode server
set vtp v2 enable
#drip
set tokenring reduction enable
set tokenring distrib-crf disable
#vlans
set vlan 999 name trbrf type trbrf bridge 0xe stp ibm
set vlan 100 name trcrf100 type trcrf parent 999 ring 0x1 mode srb
set vlan 200 name trcrf200 type trcrf parent 999 ring 0x64 mode srb
set vlan 12 name eisl12 type ethernet
#add token port to trcrf 100
set vlan 100 5/1
#add ethernet
set vlan 12 2/1

     set trunk 1/2 on

IP Routing Source-Routed Frames between TRISL VLANs Example

Figure 77 illustrates IP routing source-routed frames between two TrBRF VLANs.


Figure 77: IP Routing Source-Routed Frames between TrBRF VLANs


The following is the configuration for the router:

interface FastEthernet4/0.1
  ip address 5.5.5.1 255.255.255.0
  encapsulation tr-isl trbrf-vlan 999 bridge-num 14
  multiring trcrf-vlan 200 ring 100
  multiring all
!
interface FastEthernet4/0.2
  ip address 4.4.4.1 255.255.255.0
  encapsulation tr-isl trbrf-vlan 998 bridge-num 13
  multiring trcrf-vlan 300 ring 101
  multiring all

The following is the configuration for the Catalyst 5000 switch with the Token Ring switch module in slot 5. In this configuration, the Token Ring port attached to ring 102 is assigned with TrCRF VLAN 40 and the Token Ring port attached to ring 103 is assigned with TrCRF VLAN 50.

#vtp
set vtp domain trisl
set vtp mode server
set vtp v2 enable
#drip
set tokenring reduction enable
set tokenring distrib-crf disable
#vlans
set vlan 999 name trbrf type trbrf bridge 0xe stp ibm
set vlan 200 name trcrf200 type trcrf parent 999 ring 0x64 mode srb
set vlan 40 name trcrf40 type trcrf parent 999 ring 0x66 mode srb
set vlan 998 name trbrf type trbrf bridge 0xd stp ibm
set vlan 300 name trcrf300 type trcrf parent 998 ring 0x65 mode srb
set vlan 50 name trcrf50 type trcrf parent 998 ring 0x67 mode srb
#add token port to trcrf 40
set vlan 40   5/1
#add token port to trcrf 50
set vlan 50   5/2
set trunk 1/2 on

IPX Routing Non-Source-Routed Frames between a TRISL VLAN and a Token Ring Interface Example

Figure 78 shows IPX routing non-source-routed frames between a TRISL VLAN and a Token Ring interface.


Figure 78: IPX Routing Non-Source-Routed Frames between a TRISL VLAN and a Token Ring Interface Example


The following is the configuration for the router:

ipx routing
interface TokenRing 3/1
  ipx network 1
!
interface FastEthernet4/0.1
  ipx network 10 
  encapsulation tr-isl trbrf 999 bridge-num 14

The following is the configuration for the Catalyst 5000 switch with the Token Ring switch module in slot 5. In this configuration, the Token Ring port attached to ring 1 is assigned to the TrCRF VLAN  40.

#vtp
set vtp domain trisl
set vtp mode server
set vtp v2 enable
#drip
set tokenring reduction enable
set tokenring distrib-crf disable
#vlans
set vlan 999 name trbrf type trbrf bridge 0xe stp ieee
set vlan 40 name trcrf40 type trcrf parent 999 ring 0x1 mode srt
#add token port to trcrf 40
set vlan 40   5/1
set trunk 1/2 on

IPX Routing Source-Routed Frames between a TRISL VLAN and a Token Ring Interface Example

Figure 79 shows IPX routing source-routed frames between a TRISL VLAN and a Token Ring interface.


Figure 79: IPX Routing Source-Routed Frames between a TRISL VLAN and a Token Ring Interface


The following is the configuration for the router:

ipx routing
!
interface TokenRing 3/1
  ipx network 1 
  multiring all
!
interface FastEthernet4/0.1
  ipx network 10 
  encapsulation tr-isl trbrf 999 bridge-num 14
  multiring trcrf-vlan 200 ring 100
  multiring all

The following is the configuration for the Catalyst 5000 switch with the Token Ring switch module in slot 5. In this configuration, the Token Ring port attached to ring 1 is assigned to the TrCRF VLAN 40.

#vtp
set vtp domain trisl
set vtp mode server
set vtp v2 enable
#drip
set tokenring reduction enable
set tokenring distrib-crf disable
#vlans
set vlan 999 name trbrf type trbrf bridge 0xe stp ibm
set vlan 200 name trcrf200 type trcrf parent 999 ring 0x64 mode srb
set vlan 40 name trcrf40 type trcrf parent 999 ring 0x1 mode srb
#add token port to trcrf 40
set vlan 40   5/1
set trunk 1/2 on

IPX Routing Source-Route Frames between a TRISL VLAN and an Ethernet ISL VLAN Example

Figure 80 shows IPX routing source-route frames between a TRISL VLAN and an Ethernet ISL VLAN.


Figure 80: IPX Routing Source-Routed Frames between a TRISL VLAN and an Ethernet ISL VLAN


The following is the configuration for the router:

ipx routing
interface FastEthernet4/0.1
  ipx network 10 
  encapsulation tr-isl trbrf-vlan 999 bridge-num 14
  multiring trcrf-vlan 20 ring 100
  multiring all
!
interface FastEthernet4/0.2
  ipx network 30 
  encapsulation isl 12

The following is the configuration for the Catalyst 5000 switch with the Ethernet module in slot 2 and a Token Ring switch module in slot 5. In this configuration, the Token Ring port is assigned with TrCRF VLAN 100 and the Ethernet port is assigned with VLAN 12.

#vtp
set vtp domain trisl
set vtp mode server
set vtp v2 enable
#drip
set tokenring reduction enable
set tokenring distrib-crf disable
#vlans
set vlan 999 name trbrf type trbrf bridge 0xe stp ibm
set vlan 100 name trcrf100 type trcrf parent 999 ring 0x1 mode srb
set vlan 20 name trcrf20 type trcrf parent 999 ring 0x64 mode srb
set vlan 12 name default type eisl12
#add token port to trcrf 100
set vlan 100 5/1
#add ethernet
set vlan 12 2/1
set trunk 1/2 on

IPX Routing Source-Routed Frames between TRISL VLANs Example

Figure 81 shows IPX source-routed frames between TRISL VLANs.


Figure 81: IPX Routing Source-Routed Frames between TRISL VLANs


INDEX fIGURE shows PX source-routed d

The following is the configuration for the router:

ipx routing
interface FastEthernet4/0.1
  ipx network 10
  encapsulation tr-isl trbrf-vlan 999 bridge-num 14
  multiring trcrf-vlan 200 ring 100
  multiring all
!
interface FastEthernet4/0.2
  ipx network 20
  encapsulation tr-isl trbrf-vlan 998 bridge-num 13
  multiring trcrf-vlan 300 ring 101
  multiring all

The following is the configuration for the Catalyst 5000 switch with the Token Ring switch module in slot 5. In this configuration, the Token Ring port attached to ring 102 is assigned with TrCRF VLAN 40 and the Token Ring port attached to ring 103 is assigned with TrCRF VLAN 50.

#vtp
set vtp domain trisl
set vtp mode server
set vtp v2 enable
#drip
set tokenring reduction enable
set tokenring distrib-crf disable
#vlans
set vlan 999 name trbrf type trbrf bridge 0xe stp ibm
set vlan 200 name trcrf200 type trcrf parent 999 ring 0x64 mode srb
set vlan 40 name trcrf40 type trcrf parent 999 ring 0x66 mode srb
set vlan 998 name trbrf type trbrf bridge 0xd stp ibm
set vlan 300 name trcrf300 type trcrf parent 998 ring 0x65 mode srb
set vlan 50 name trcrf50 type trcrf parent 998 ring 0x67 mode srb
#add token port to trcrf 40
set vlan 40   5/1
#add token port to trcrf 50
set vlan 50   5/2
set trunk 1/2 on

SRB between Token Ring and TRISL VLAN Example

Figure 82 illustrates SRB between a Token Ring interface on a router and a TRISL VLAN.


Figure 82: SRB between a Token Ring Interface and TRISL VLAN

The following is the configuration for the router with the Token Ring interface:

source-bridge ring-group 100
!
interface TokenRing3/1
  ring speed 16
  source-bridge 10 1 100
  source-bridge spanning
!
interface FastEthernet4/0.1
  encapsulation tr-isl trbrf-vlan 999 bridge-num 14
  source-bridge trcrf-vlan 40 ring-group 100
  source-bridge spanning
!

The following is the configuration for the Catalyst 5000 switch:

#vtp
set vtp domain trisl
set vtp mode server
set vtp v2 enable
#drip
set tokenring reduction enable
set tokenring distrib-crf disable
#vlans
set vlan 999 name trbrf type trbrf bridge 0xe stp ibm
set vlan 40 name trcrf40 type trcrf parent 999 ring 0x64 mode srb
set vlan 50 name trcrf50 type trcrf parent 999 ring 0x14 mode srb
#add token port to trcrf 50
set vlan 50   5/1

SRB between TRISL VLANs Example

Figure 83 illustrates SRB between two TrCRF VLANs.


Figure 83: SRB between TRISL VLANs


The following is the configuration for the router:

source-bridge ring-group 101
!
interface FastEthernet4/0.1
  encapsulation tr-isl trbrf 999 bridge-num 14
  source-bridge trcrf-vlan 100 ring-group 101
  source-bridge spanning
!
interface FastEthernet4/0.2
  encapsulation tr-isl trbrf 998 bridge-num 13 
  source-bridge trcrf-vlan 102 ring-group 101
  source-bridge spanning

The following is the configuration for the Catalyst 5000 switch with the Token Ring switch module in slot 5. The Token Ring port on 5/1 is assigned to TrCRF VLAN 40 and the Token Ring port on 5/2 is assigned to TrCRF VLAN 50.

In this configuration, the keyword name is optional and srb is the default mode.

#vtp
set vtp domain trisl
set vtp mode server
set vtp v2 enable
#drip
set tokenring reduction enable
set tokenring distrib-crf disable
#vlans
set vlan 999 name trbrf type trbrf bridge 0xe stp ibm
set vlan 100 name trcrf100 type trcrf parent 999 ring 0x65 mode srb
set vlan 40 name trcrf40 type trcrf parent 999 ring 0x1 mode srb
set vlan 998 name trbrf type trbrf bridge 0xd stp ibm 
set vlan 102 name trcrf102 type trcrf parent 998 ring 0x65 mode srb
set vlan 50 name trcrf50 type trcrf parent 998 ring 0xa mode srb
#add token port to trcrf 40
set vlan 40   5/1
#add token port to trcrf 50
set vlan 50   5/2
#enable trunk
set trunk 1/2 on

Transparent Bridging between Token Ring and TRISL VLAN Example

Figure 84 illustrates transparent bridging between a router's Token Ring interface and a TRISL VLAN.


Figure 84: Transparent Bridging between Token Ring and TRISL VLAN

The following is the configuration for the router:

bridge 1 protocol ieee
!
interface Tokenring0  bridge-group 1
!
interface FastEthernet0/0.1
 encapsulation tr-isl trbrf-vlan 50 bridge-num 11
 bridge-group 1

The following is the configuration for the Catalyst 5000 switch with a Token Ring switch module in slot 5:

#vtp
set vtp domain trisl
set vtp mode server
set vtp v2 enable
#drip
set tokenring reduction enable
set tokenring distrib-crf disable
#vlans
set vlan 50 name trbrf50 type trbrf bridge 0xb stp ieee
set vlan 100 name trcrf100 type trcrf ring 0x14 parent 50 mode srt
#enable trunk
set trunk 1/2 on
#add token port to trcrf 100
set vlan 100 5/1

SR/TLB between a TRISL VLAN and an Ethernet Interface Example

Figure 85 illustrates SR/TLB between a TRISL VLAN and an Ethernet interface.


Figure 85: SR/TLB between a TRISL VLAN and an Ethernet Interface


The following is the configuration for the router:

source-bridge ring-group 100
source-bridge transparent 100 101 6 1
!
interface Ethernet2/0
  bridge-group 1
!
interface FastEthernet4/0.1
  encapsulation tr-isl trbrf-vlan 999 bridge-num 14 
  source-bridge trcrf-vlan 200 ring-group 100
  source-bridge spanning
!
bridge 1 protocol ieee
!

The following is the configuration for the Catalyst 5000 switch with an Ethernet card in module 5 and using port 1. The Token Ring port on 5/1 is assigned to TrCRF VLAN 40.

#vtp
set vtp domain trisl
set vtp mode server
set vtp v2 enable
#drip
set tokenring reduction enable
set tokenring distrib-crf disable
#vlans
set vlan 999 name trbrf999 type trbrf bridge 0xe stp ibm 
set vlan 200 name trcrf200 type trcrf parent 999 ring 0x64 mode srb
set vlan 40 name trcrf40 type trcrf parent 999 ring 0x1 mode srb
#add token port to trcrf 40
set vlan 40   5/1
#enable trunk
set trunk 1/2 on

SR/TLB between a TRISL VLAN and an Ethernet ISL VLAN Example

Figure 86 illustrates SR/TLB between a TRISL VLAN and an Ethernet ISL VLAN.


Figure 86: SR/TLB between a TRISL VLAN and an Ethernet ISL VLAN


The following is the configuration for the router:

source-bridge ring-group 100
source-bridge transparent 100 101 6 1
!
interface FastEthernet4/0.1
  encapsulation tr-isl trbrf-vlan 999 bridge-num 14 
  source-bridge trcrf-vlan 20 ring-group 100
  source-bridge spanning
!
interface FastEthernet4/0.2
  encapsulation isl 12
  bridge-group 1
!
bridge 1 protocol ieee

The following is the configuration for the Catalyst 5000 switch with an Ethernet module in slot 2 and a Token Ring switch module in slot 5. In this configuration, the Token Ring port attached to ring 101 is assigned to TrCRF VLAN 21, and the router's virtual ring is assigned to TrCRF VLAN 20.

#vtp
set vtp domain trisl
set vtp mode server
set vtp v2 enable
#drip
set tokenring reduction enable
set tokenring distrib-crf disable
#vlans
set vlan 999 type trbrf bridge 0xe stp ibm
set vlan 20 type trcrf parent 999 ring 0x64 mode srb
set vlan 21 type trcrf parent 999 ring 0x65 mode srb
#add token port to trcrf 21
set vlan 21 5/1
#add ethernet
set vlan 12 type ethernet
set vlan 12 2/1
set trunk 1/2 on


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