Cisco WS-SUP32-GE-3B - Supervisor Engine 32 Software Configuration Manual page 137

Chapter 8 Configuring LAN Ports for Layer 2 Switching
When configuring the native VLAN, note the following information:
•
•
Complete the steps in the
Note
tasks in this section.
Configuring the List of VLANs Allowed on a Trunk
Note Complete the steps in the
performing the tasks in this section.
To configure the list of VLANs allowed on a trunk, perform this task:
Command
Router(config-if)# switchport trunk allowed vlan {add
| except | none | remove} vlan [,vlan[,vlan[,...]]
Router(config-if)# no switchport trunk allowed vlan
When configuring the list of VLANs allowed on a trunk, note the following information:
•
•
•
Complete the steps in the
Note
tasks in this section.
Configuring the List of Prune-Eligible VLANs
Note Complete the steps in the
performing the tasks in this section.
OL-11439-03
The vlan_ID value can be 1 through 4094, except reserved VLANs (see
The access VLAN is not automatically used as the native VLAN.
"Completing Trunk Configuration" section on page 8-12
"Configuring a LAN Port for Layer 2 Switching" section on page 8-7
The vlan parameter is either a single VLAN number from 1 through 4094, or a range of VLANs
described by two VLAN numbers, the lesser one first, separated by a dash. Do not enter any spaces
between comma-separated vlan parameters or in dash-specified ranges.
All VLANs are allowed by default.
You can remove VLAN 1. If you remove VLAN 1 from a trunk, the trunk interface continues to send
and receive management traffic, for example, Cisco Discovery Protocol (CDP), VLAN Trunking
Protocol (VTP), Port Aggregation Protocol (PAgP), and DTP in VLAN 1.
"Completing Trunk Configuration" section on page 8-12
"Configuring a LAN Port for Layer 2 Switching" section on page 8-7
Catalyst Supervisor Engine 32 PISA Cisco IOS Software Configuration Guide, Release 12.2ZY
Configuring LAN Interfaces for Layer 2 Switching
Purpose
(Optional) Configures the list of VLANs allowed on the
trunk.
Reverts to the default value (all VLANs allowed).
Table 12-1 on page 12-2).
after performing the
before
after performing the
before
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