Cisco Catalyst 3750 Command Reference Manual page 638

vlan (global configuration)
If you enter an invalid VLAN ID, you receive an error message and do not enter config-vlan mode.
Entering the vlan command with a VLAN ID enables config-vlan mode. When you enter the VLAN ID
of an existing VLAN, you do not create a new VLAN, but you can modify VLAN parameters for that
VLAN. The specified VLANs are added or modified when you exit the config-vlan mode. Only the
shutdown command (for VLANs 1 to 1005) takes effect immediately.
These configuration commands are available in config-vlan mode. The no form of each command returns
the characteristic to its default state.
Although all commands are visible, the only config-vlan command supported on extended-range VLANs
Note
is mtu mtu-size. For extended-range VLANs, all other characteristics must remain at the default state.
are are-number: defines the maximum number of all-routes explorer (ARE) hops for this VLAN.
•
This keyword applies only to TrCRF VLANs.The range is 0 to 13. The default is 7. If no value is
entered, 0 is assumed to be the maximum.
backupcrf: specifies the backup CRF mode. This keyword applies only to TrCRF VLANs.
•
bridge {bridge-number| type}: specifies the logical distributed source-routing bridge, the bridge
•
that interconnects all logical rings having this VLAN as a parent VLAN in FDDI-NET, Token
Ring-NET, and TrBRF VLANs. The range is 0 to 15. The default bridge number is 0 (no
source-routing bridge) for FDDI-NET, TrBRF, and Token Ring-NET VLANs. The type keyword
applies only to TrCRF VLANs and is one of these:
exit: applies changes, increments the VLAN database revision number (VLANs 1 to 1005 only), and
•
exits config-vlan mode.
media: defines the VLAN media type. See
•
media types.
Note
mtu mtu-size: specifies the maximum transmission unit (MTU) (packet size in bytes). The range is
•
1500 to 18190. The default is 1500 bytes.
Catalyst 3750 Switch Command Reference
2-610
enable backup CRF mode for this VLAN.
–
disable backup CRF mode for this VLAN (the default).
–
srb (source-route bridging)
–
srt (source-route transparent) bridging VLAN
–
The switch supports only Ethernet ports. You configure only FDDI and Token Ring
media-specific characteristics for VLAN Trunking Protocol (VTP) global advertisements to
other switches. These VLANs are locally suspended.
ethernet is Ethernet media type (the default).
–
fddi is FDDI media type.
–
fd-net is FDDI network entity title (NET) media type.
–
tokenring is Token Ring media type if the VTP v2 mode is disabled, or TrCRF if the VTP
–
Version 2 (v) mode is enabled.
tr-net is Token Ring network entity title (NET) media type if the VTP v2 mode is disabled or
–
TrBRF media type if the VTP v2 mode is enabled.
Chapter 2 Catalyst 3750 Switch Cisco IOS Commands
Table 2-36 for valid commands and syntax for different
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