Need help

[edbadmin1]

Hi there,

I was trying to create a new VLAN on my core switch but after creating,I cannot ping to the new VLAN. Attached with my new VLAN config;

Core1#conf t

Core1(config)#interface Vlan171

Core1(config)#ip address 10.19.22.2 255.255.255.0

Core1(config)#no ip redirects

Core1(config)#standby ip 10.19.22.1

Core1(config)#router ospf 100

Core1(config)#passive-interface Vlan171

Core1(config)#end

[edbadmin1]

Any1 helping me ? =X

[Kevin Dorrell]

I think you are asking how do you add the VLAN to the trunks so it is seen by the other switches. You need the new VLAN 171 to be allowed on all the trunks that carry the other VLANs in MST instance 2.

So, do a show spanning-tree mst 2. (I think you added 171 into instance 2, didn't you?). In the list of interfaces, identify the ones that are trunks, and have a look at their configuration. They are likely to have commands such as switchport trunk allowed vlan l,m,n etc. If so, (and only if so, and only if 171 is not in the list already) you need to add VLAN 171 into that list. switchport trunk allowed vlan add 171.

You may need to do the same on the connecting switches.

Kevin Dorrell

Luxembourg

[Kevin Dorrell]

Just wanted to add a warning. Be very very careful not to forget the add keyword. If you forget it, you will lose the VLANs that are already on the trunk.

Kevin Dorrell

Luxembourg

[Kevin Dorrell]

ftallet - Francois, if you are reading this ...

Is there any chance in future versions we could have a command like switchport trunk allowed vlan [add] mst n, to allow/add all the VLANs in MST instance n? Wouldn't it make MST configuration easier?

Kevin Dorrell

Luxembourg

[edbadmin1]

hi there,

I was trying the command " switchport trunk allowed vlan " but it don't work in Cisco 6509...any advise ?