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Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
78-13315-02
Chapter 11 Configuring VLANs
Configuring Token Ring 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
illustrates the backup TrCRF.
Figure 11-5 Backup TrCRF
Token Ring VLAN Configuration Guidelines
When you create or modify Token Ring VLANs, take the following guidelines into consideration:
•
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.
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
Chapter 10, “Configuring VTP.”
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:
TrCRF
600
TrBRF 1
ISL
S6811
Switch A
Switch B
TrCRF
601
Backup
TrCRF 612
Task
Command
Step 1
Create a new Token Ring TrBRF-type VLAN.
set vlan
vlan
[
name
name
]
type trbrf
[
said
said
]
[
mtu
mtu
]
bridge
bridgeber
[
stp
{
ieee
|
ibm
}]
Step 2
Verify the VLAN configuration.
show vlan
[
vlan
]
