Spanning tree instance(s) for vlan 20 does not exist.

[alsayed]

Hi

PS Examine the following Output:

i have been configured a switch that is not online right now;what does mean the following output?error?miss configuration?or what?

interface Vlan20

ip address 10.10.20.2 255.255.255.0

ip helper-address 10.10.10.10

no ip redirects

shutdown

mls rp vtp-domain TEST

mls rp ip

standby 20 ip 10.10.20.1

standby 20 timers 3 9

standby 20 priority 110

standby 20 preempt

C-DS2#sh spanning-tree vlan 20 detail

Spanning tree instance(s) for vlan 20 does not exist.

C-DS2#sh spanning-tree vlan 20 summary

Switch is in pvst mode

C-DS2#sh spanning-tree vlan 20 ACTive

Spanning tree instance(s) for vlan 20 does not exist.

C-DS2#sh spanning-tree ROOt

C-DS2#

C-DS2#sh spanning-tree VLan 20 INConsistentports

Name Interface Inconsistency

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

C-DS2#

10xs for ur help

[pkhatri]

Hi,

Can you check that you don't have a command such as the following in your config:

no spanning-tree vlan 20

If so, configure the following command in order to enable STP for that VLAN:

spanning-tree vlan 20

Paresh

[alsayed]

Hi Paresh

2 days ago i used the: no spanning-tree vlan 20 ;than i reenabled it again.i was configured this vlan with priority of 8xx!

10xs

[pkhatri]

Hmm...does the VLAN actually exist ? What does 'show vlan' show ?

Paresh

[alsayed]

ohhh Pareh u hunted it quickly !

the switch its not on line yet;and need to be connected to CORE(6509-SUP20)and To learn the Vlan's?am i right?am i understood U?

10xs

[pkhatri]

Yeah.. if you have the switch configured as a VTP client, you need to get the VTP server (your core) to pass it VLAN info.

Does 'show vlan' indicate that VLAN 20 exists ?

Paresh

[alsayed]

u r right paresh;i make the switch in client mode to learn the vlan's from the core.