Cisco Catalyst 2950 Command Reference

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Catalyst 2950 and Catalyst 2955 Switch Command Reference
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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.

Cisco Catalyst 2950 Specifications

General

Forwarding Bandwidth	8.8 Gbps
Switching Capacity	13.6 Gbps
Forwarding Rate	6.6 Mpps
Weight	3.6 kg
RAM	16 MB
Flash Memory	8 MB
Operating Humidity	10% to 85% non-condensing
Uplink Ports	2 x 10/100/1000Base-T
Dimensions	4.4 cm x 44.5 cm x 24.2 cm
Remote Management Protocol	SNMP, Telnet, HTTP
Features	Quality of Service (QoS), VLAN support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.1D, IEEE 802.1Q, IEEE 802.1p
Status Indicators	system
Operating Temperature	0 to 45°C
Ports	24 x 10/100 Ethernet ports
MAC Address Table Size	8, 192 entries
Power Supply	Internal 100-240V AC, 50-60Hz