Configuring Token Ring Inter-Switch Link
Technology Overview
BC-146
Cisco IOS Bridging and IBM Networking Configuration Guide
78-11737-02
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 the following platforms with any one of the following port adapters:
• Cisco 7500 or Cisco 7200 series routers
–
Two-port Fast Ethernet/ISL 100BaseTX
–
Two-port Fast Ethernet/ISL 100BaseFX
–
One-port Fast Ethernet 100BaseTX
–
One-port Fast Ethernet 100BaseFX
• Cisco 4500 or 4700 series routers
–
NM-1FE
• Cisco 3600 or 2600 series routers
–
NM-1FE1CE1
–
NM-1FE1CT1
–
NM-1FE1R2W
–
NM-1FE2CE1
–
NM-1FE2CT1
–
NM-1FE2W
–
NM-2FE2W
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.
TRISL provides the following capabilities and features, which will be described in the “TRISL
Configuration Task List” section on page 148 and the “TRISL Configuration Examples” section on
page 154:
• IP routing for source-routed and non-source-routed frames between TRISL VLANs and any LAN,
ELAN, or VLAN.
• IPX routing for source-routed and non-source-routed frames between TRISL VLANs and any
LANs, ELANs, or VLANs.
• Source-Route Bridging (SRB) between TRISL VLANs and SRB-capable LANs, ELANs, or
VLANs.
• Source-Route Transparent Bridging (SRT) between TRISL VLANs and SRT-capable LANs,
ELANs, or VLANs.
• Source-Route Translational Bridging (SR/TLB) between TRISL VLANs and Ethernet LANs,
ELANs, or VLANs.
• Duplicate Ring Protocol (DRiP), which prevents external loops that could result if the router’s
virtual ring number were duplicated elsewhere in the network.
Note VLAN Trunk Protocol (VTP) is currently not supported for TRISL on the routers.
