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Community Member

Maintaining a VLAN interface up

35xx/37xx switches.

Any way to keep a layer 3 vlan interface up without any access ports or trunks up?

Thanks

Joe

3 REPLIES
Cisco Employee

Re: Maintaining a VLAN interface up

Hello,

You can use the command switchport autostate exclude on all physical ports to exclude them from influencing the status of associated SVIs. Unfortunately, this command is not specific to any VLAN and using it will result in all SVI states being decoupled from the state of physical switchports configured with this command.

More details can be found here:

http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_55_se/command/reference/cli3.html#wp3553817

http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_55_se/configuration/guide/swint.html#wp2208158

May I ask why you need to do this? Having the SVI state decoupled from the actual state of physical interfaces may result in connectivity issues (a switch may believe to be able to talk to a VLAN although it has no usable interfaces in that VLAN).

Best regards,

Peter

Purple

Re: Maintaining a VLAN interface up

  Peter is correct you could end up blackholing traffic .

Community Member

Re: Maintaining a VLAN interface up

Needed to test a VPN backup solution prior to users being connected.

Thanks

Joe

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