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Community Member

C6K Native IOS: show vlan command

Dear NetPro Team,

I would like to know how and where to issue the to me extremly interesting command show vlan internal usage.

Thanks in advance

By the way the command is described in the documentation!

4 REPLIES
Silver

Re: C6K Native IOS: show vlan command

See this URL:

http://www.cisco.com/univercd/cc/td/doc/product/core/cis7600/12111bex/cmdref/show1.htm#35715

Use the show vlan internal usage command to display internal VLAN allocation information.

Usage Guidelines

If your system is configured with a Supervisor Engine 1, valid values for vlan-id are from 1 to 1005. If your system is configured with a Supervisor Engine 2, valid

values for vlan-id are from 1 to 4094. Extended-range VLANs are not supported on systems configured with a Supervisor Engine 1.

Examples

This example shows how to display current internal VLAN allocation information:

Router# show vlan internal usage

VLAN Usage

---- --------------------

1025 -

1026 -

1027 -

1028 -

1029 Port-channel6

1030 GigabitEthernet1/2

1032 FastEthernet3/20

1033 FastEthernet3/21

1129 -

This example shows how to display internal VLAN allocation information for a specific VLAN:

Router# show vlan id 1030 internal usage

VLAN Usage

---- --------------------

1030 GigabitEthernet1/2

Hope this helps,

Don

Community Member

Re: C6K Native IOS: show vlan command

Hi Don,

I tried it -after organizing a sup2 and an EX image- and it is working as advertised, thanks a lot!

Have a great weekend

Andy

Cisco Employee

Re: C6K Native IOS: show vlan command

Internal VLANs are used for:

- a few internal processes, such as diagnostics & multicast, which allocate hidden vlans

- routed interfaces (ie, ports configured as L3 interfaces, not switchports)

- communication between WAN interfaces (OSM, FlexWAN) and PFC/MSFC

So you may want to use this to figure out what vlan IDs have been allocated for the above purposes.

Community Member

Re: C6K Native IOS: show vlan command

Thank you very much for your answer!

Andy

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