Changing The Pruning-Eligible List - Cisco Catalyst 3550 series Software Configuration Manual

Configuring VLAN Trunks
Command
Step 4 switchport trunk allowed vlan {add |
all | except | remove} vlan-list
Step 5
end
Step 6
show interfaces interface-id switchport Verify your entries in the Trunking VLANs Enabled field of the display.
Step 7 copy running-config startup-config
To return to the default allowed VLAN list of all VLANs, use the no switchport trunk allowed vlan
interface configuration command.
This example shows how to remove VLAN 2 from the allowed VLAN list:
Switch(config)# interface fastethernet0/1
Switch(config-if)# switchport trunk allowed vlan remove 2
Switch(config-if)# end
Switch#

Changing the Pruning-Eligible List

The pruning-eligible list applies only to trunk ports. Each trunk port has its own eligibility list. VTP
pruning must be enabled for this procedure to take effect. The
page 13-13
Beginning in privileged EXEC mode, follow these steps to remove VLANs from the pruning-eligible list
on a trunk port:
Command
Step 1 configure terminal
Step 2
interface interface-id
Step 3
switchport trunk pruning vlan {add |
except | none | remove} vlan-list
[,vlan[,vlan[,,,]]
Step 4
end
Catalyst 3550 Multilayer Switch Software Configuration Guide
12-22
Purpose
(Optional) Configure the list of VLANs allowed on the trunk.
For explanations about using the add, all, except, and remove keywords,
refer to the command reference for this release.
The vlan-list parameter is either a single VLAN number from 1 to 4094
or a range of VLANs described by two VLAN numbers, the lower one
first, separated by a hyphen. Do not enter any spaces between
comma-separated VLAN parameters or in hyphen-specified ranges.
All VLANs are allowed by default.
Return to privileged EXEC mode.
(Optional) Save your entries in the configuration file.
describes how to enable VTP pruning.
Purpose
Enter global configuration mode.
Enter interface configuration mode, and select the trunk port for which
VLANs should be pruned.
Configure the list of VLANs allowed to be pruned from the trunk. (See
the "VTP Pruning" section on page
For explanations about using the add, except, none, and remove
keywords, refer to the command reference for this release.
Separate nonconsecutive VLAN IDs with a comma and no spaces; use a
hyphen to designate a range of IDs. Valid IDs are from 2 to 1001.
Extended-range VLANs (VLAN IDs 1006 to 4094) cannot be pruned.
VLANs that are pruning-ineligible receive flooded traffic.
The default list of VLANs allowed to be pruned contains VLANs 2 to
1001.
Return to privileged EXEC mode.
Chapter 12 Configuring VLANs
"Enabling VTP Pruning" section on
13-4).
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