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Chapter 11
Configuring VLANs
If the ISL connection between the switches fails, the port in the backup TrCRF on each affected switch
automatically becomes active, rerouting traffic between the undistributed TrCRFs through the backup
TrCRF. When the ISL connection is reestablished, all but one port in the backup TrCRF is disabled.
Figure 11-5
Figure 11-5 Backup TrCRF
Token Ring VLAN Configuration Guidelines
When you create or modify Token Ring VLANs, take the following guidelines into consideration:
•
•
•
Creating or Modifying a Token Ring TrBRF VLAN
You must enable VTP version 2 before you create Token Ring VLANs. For information on enabling
VTP version 2, see
You must specify a bridge number when you create a new TrBRF.
To create a new Token Ring TrBRF VLAN, perform this task in privileged mode:
Task
Step 1
Create a new Token Ring TrBRF-type VLAN.
Step 2
Verify the VLAN configuration.
78-13315-02
illustrates the backup TrCRF.
Switch A
ISL
TrBRF 1
TrCRF
600
Backup
TrCRF 612
For Token Ring VLANs, the default TrBRF (VLAN 1005) can only be the parent of the default
TrCRF (VLAN 1003). You cannot specify the default TrBRF as the parent of a user-configured
TrCRF.
You must configure a TrBRF before you configure the TrCRF; that is, the parent TrBRF VLAN you
specify for the TrCRF must already exist.
In a Token Ring environment, the logical ports of the TrBRF (the connection between the TrBRF
and the TrCRF) are placed in a blocked state if either of these conditions exists:
–
The TrBRF is running the IBM STP, and the TrCRF is in SRT mode.
The TrBRF is running the IEEE STP, and the TrCRF is in SRB mode.
–
Chapter 10, "Configuring VTP."
Switch B
TrCRF
601
Command
set vlan vlan [name name] type trbrf [said said]
[mtu mtu] bridge bridgeber [stp {ieee | ibm}]
show vlan [vlan]
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
Configuring Token Ring VLANs
11-27
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Troubleshooting
