Cisco 2950 - Catalyst Switch Especificações descarregar pdf (Página 548)

2-522

Catalyst 2950 and Catalyst 2955 Switch Command Reference

OL-10102-02

Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands

vlan (global configuration)

If you try to create an extended-range VLAN when the switch is not in VTP transparent mode, the VLAN

is rejected, and you receive an error message.

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.

Note Although all commands are visible, the only VLAN configuration command supported on

extended-range VLANs 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 ARE 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.

–

enable backup CRF mode for this VLAN.

–

disable backup CRF mode for this VLAN (the default).

• 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 bridge number 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:

–

srb (source-route bridging)

–

srt (source-route transparent) bridging VLAN

• 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 Table 2-35 for valid commands and syntax for different

media types.

Note 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.

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