Specifications

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Catalyst 2950 and Catalyst 2955 Switch Command Reference
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Chapter 2 Cisco IOS Commands
vlan (global configuration)
• media: defines the VLAN media type. See Table 2-22 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.
• mtu mtu-size: specifies the maximum transmission unit (MTU) (packet size in bytes). Valid values
are from 1500 to 18190. The default is 1500 bytes.
• name vlan-name: names the VLAN with an ASCII string from 1 to 32 characters that must be unique
within the administrative domain. The default is VLANxxxx where xxxx represents four numeric
digits (including leading zeros) equal to the VLAN ID number.
• no: negates a command or returns it to the default setting.
• parent parent-vlan-id: specifies the parent VLAN of an existing FDDI, Token Ring, or TrCRF
VLAN. This parameter identifies the TrBRF to which a TrCRF belongs and is required when
defining a TrCRF. Valid values are from 0 to 1005. The default parent VLAN ID is 0 (no parent
VLAN) for FDDI and Token Ring VLANs. For both Token Ring and TrCRF VLANs, the parent
VLAN ID must already exist in the database and be associated with a Token Ring-NET or TrBRF
VLAN.
• remote-span: adds the Remote SPAN (RSPAN) trait to the VLAN. When the RSPAN trait is added
to an existing VLAN, the VLAN is first removed and then recreated with the RSPAN trait. Any
access ports are deactivated until the RSPAN trait is removed. The new RSPAN VLAN is propagated
via VTP for VLAN-IDs less than 1005. This command is available only if your switch is running
the EI.
• ring ring-number: defines the logical ring for an FDDI, Token Ring, or TrCRF VLAN. Valid values
are from 1 to 4095. The default for Token Ring VLANs is 0. For FDDI VLANs, there is no default.
• said said-value: specifies the security association identifier (SAID) as documented in IEEE 802.10.
The value is an integer from 1 to 4294967294 that must be unique within the administrative domain.
The default value is 100000 plus the VLAN ID number.
• shutdown: shuts down VLAN switching on the VLAN. This command takes effect immediately.
Other commands take effect when you exit config-vlan mode.
• state: specifies the VLAN state:
– active means the VLAN is operational (the default).
– suspend means the VLAN is suspended. Suspended VLANs do not pass packets.
• ste ste-number: defines the maximum number of spanning-tree explorer (STE) hops. This keyword
applies only to TrCRF VLANs. Valid values are from 0 to 13. The default is 7.