Regarding Spanning Tree

[akash.deep]

I have created a new L2-vlan in switch but when i am trying below command getting the below message

Switch# sh vlan id 218

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
218  VLAN0218                         active    Po1, Po50, Eth1/23, Eth1/24
                                                Eth1/25, Eth1/26

Njse-425-nexus5k-1# sh spanning-tree vlan  218
Spanning tree instance(s) for vlan does not exist.
Njse-425-nexus5k-1#

can you please let me know how can i enable the spanning tree for this vlan

[Ganesh Hariharan]

what is the output of show vlan brief in N5k , Is VLAN 218 is showing on VLAN database.

-GI

[Rajeshkumar Gatti]

Many possible reasons for this to happen and a few I can think of is listed below-

1. If your 5k is in VPC then your vlan is not created on the peer 5k

2.vlan not allowed on the peer link

3. STP is disabled for the vlan

4. Ports where the vlan is allowed in down

-Raj

[Austin Sabio]

Not sure, if VPC is involved in your config. you can post your spanning tree config but I would think you need to specify native vlan and allow your vlans through the trunk link.

Switch(config-if)# switchport mode trunk
Switch(config-if)# switchport trunk allowed vlan id
Switch(config-if)# switchport trunk native vlan id

hope it helps, 

Aus