Vlan Configuration Guidelines And Restrictions - Cisco WS-SUP32-GE-3B - Supervisor Engine 32 Software Configuration Manual

VLAN Configuration Guidelines and Restrictions

Table 12-6
Parameter
MTU size
Bridge number
STP type
VLAN state
VLAN Configuration Guidelines and Restrictions
When creating and modifying VLANs in your network, follow these guidelines and restrictions:
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Catalyst Supervisor Engine 32 PISA Cisco IOS Software Configuration Guide, Release 12.2ZY
12-8
Token Ring (TrBRF) VLAN Defaults and Ranges (continued)
Supervisor engine redundancy does not support nondefault VLAN data file names or locations. Do
not enter the vtp file file_name command on a switch that has a redundant supervisor engine.
Before installing a redundant supervisor engine, enter the no vtp file command to return to the
default configuration.
You can configure extended-range VLANs only in global configuration mode. You cannot configure
extended-range VLANs in VLAN database mode. See the
on page 12-9.
Before you can create a VLAN, the Catalyst 6500 series switch must be in VTP server mode or VTP
transparent mode. For information on configuring VTP, see
The VLAN configuration is stored in the vlan.dat file, which is stored in nonvolatile memory. You
can cause inconsistency in the VLAN database if you manually delete the vlan.dat file. If you want
to modify the VLAN configuration or VTP, use the commands described in this guide and in the
Catalyst Supervisor Engine 32 PISA Cisco IOS Command Reference, Release 12.2ZY, publication.
To do a complete backup of your configuration, include the vlan.dat file in the backup.
The Cisco IOS end command is not supported in VLAN database mode.
You cannot enter Ctrl-Z to exit VLAN database mode.
Catalyst 6500 series switches do not support Token Ring or FDDI media. The switch does not
forward FDDI, FDDI-Net, TrCRF, or TrBRF traffic, but it can propagate the VLAN configuration
through VTP.
When a Catalyst 6500 series switch is configured as a VTP server, you can configure FDDI and
Token Ring VLANs from the switch.
You must configure a TrBRF before you configure the TrCRF (the parent TrBRF VLAN you specify
must exist).
In a Token Ring environment, the logical interfaces (the connection between the TrBRF and the
TrCRF) of the TrBRF 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.
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Default
VTPv1 1500; VTPv2 4472
1
ibm
active
Chapter 12 Configuring VLANs
Range
1500–18190
0–15
auto, ibm, ieee
active, suspend
"VLAN Configuration Options" section
Chapter 11, "Configuring VTP."
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