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Cisco Catalyst 2950 Command Reference

Cisco Catalyst 2950
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2-509
Catalyst 2950 and Catalyst 2955 Switch Command Reference
0L-10102-01
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
switchport trunk
switchport trunk
Use the switchport trunk interface configuration command to set the trunk characteristics when the
interface is in trunking mode. Use the no form of the command without keywords to reset all of the
trunking characteristics to the defaults. Use the no form with keywords to reset those characteristics to
the defaults.
switchport trunk {{allowed vlan vlan-list} | {native vlan vlan-id} | {pruning vlan vlan-list}}
no switchport trunk {{allowed vlan vlan-list} | {native vlan vlan-id} | {pruning vlan vlan-list}}
Syntax Description
The vlan-list format is all | none | [add | remove | except] vlan-atom where:
all specifies all VLANs from 1 to 4094. This keyword is not allowed on commands that do not
permit all VLANs in the list to be set at the same time.
none means an empty list. This keyword is not allowed on commands that require certain VLANs
to be set or at least one VLAN to be set.
add adds the defined list of VLANs to those currently set instead of replacing the list. Valid IDs are
1 to 1005; extended-range VLAN IDs are valid in some cases.
Note You can add extended-range VLANs to the allowed VLAN list, but not to the
pruning-eligible VLAN list.
Separate nonconsecutive VLAN IDs with a comma; do not enter a space after the comma. Use a
hyphen to designate a range of IDs; do not enter a space before or after the hyphen.
remove removes the defined list of VLANs from those currently set instead of replacing the list.
Valid IDs are 2 to 1001; extended-range VLAN IDs are valid in some cases. You cannot remove
VLAN 1 or VLANs 1002 to 1005 from the list.
Note You can remove extended-range VLANs (VLAN IDs greater than 1005) from the allowed
VLAN list, but you cannot remove them from the pruning-eligible list.
Separate nonconsecutive VLAN IDs with a comma; do not enter a space after the comma. Use a
hyphen to designate a range of IDs; do not enter a space before or after the hyphen.
except lists the VLANs that should be calculated by inverting the defined list of VLANs. (VLANs
are added except the ones specified.) Valid IDs are 1 to 1001. Separate nonconsecutive VLAN IDs
with a comma; do not enter a space after the comma. Use a hyphen to designate a range of IDs; do
not enter a space before or after the hyphen.
allowed vlan vlan-list Set the list of allowed VLANs that can receive and send traffic on this
interface in tagged format when in trunking mode. See the following vlan-list
format. The none keyword is not valid. The default is all.
native vlan vlan-id Set the native VLAN for sending and receiving untagged traffic when the
interface is in IEEE 802.1Q trunking mode. The range is 1 to 4094.
pruning vlan vlan-list Set the list of VLANs that are enabled for VTP pruning when in trunking
mode. The all keyword is not valid.

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Cisco Catalyst 2950 Specifications

General IconGeneral
Forwarding Bandwidth8.8 Gbps
Switching Capacity13.6 Gbps
Forwarding Rate6.6 Mpps
Weight3.6 kg
RAM16 MB
Flash Memory8 MB
Operating Humidity10% to 85% non-condensing
Uplink Ports2 x 10/100/1000Base-T
Dimensions4.4 cm x 44.5 cm x 24.2 cm
Remote Management ProtocolSNMP, Telnet, HTTP
FeaturesQuality of Service (QoS), VLAN support
Compliant StandardsIEEE 802.3, IEEE 802.3u, IEEE 802.1D, IEEE 802.1Q, IEEE 802.1p
Status Indicatorssystem
Operating Temperature0 to 45°C
Ports24 x 10/100 Ethernet ports
MAC Address Table Size8, 192 entries
Power SupplyInternal 100-240V AC, 50-60Hz

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