VSS Port-Channel in 4500-X - One VSL link in (w)

[delpo40]

Hi,

We have 2 x 10Gbps links configured on each of a pair of 4500-X switches configured for VSS - with the intention of creating a 20Gbps VSL port-channel.

I have noticed that that one of the port-channel links is in the waiting state:

10 Po10(SU) - Te1/1/1(P) Te1/2/8(w)
11 Po11(SU) - Te2/1/1(P) Te2/2/8(w)

Working interface configs:

interface TenGigabitEthernet1/1/1

description VSS
switchport mode trunk
switchport nonegotiate
no lldp transmit
no lldp receive
channel-group 10 mode on
service-policy output VSL-Queuing-Policy
end

interface TenGigabitEthernet2/1/1
description VSS
switchport mode trunk
switchport nonegotiate
no lldp transmit
no lldp receive
channel-group 11 mode on
service-policy output VSL-Queuing-Policy
end

Not-working interface configs:

interface TenGigabitEthernet1/2/8
description VSS
switchport mode trunk
switchport nonegotiate
no lldp transmit
no lldp receive
channel-group 10 mode on
service-policy output VSL-Queuing-Policy
end

interface TenGigabitEthernet2/2/8
description VSS
switchport mode trunk
switchport nonegotiate
no lldp transmit
no lldp receive
channel-group 11 mode on
service-policy output VSL-Queuing-Policy
end

[M02@rt37]

Hi,

Could you please show me the interface port-channel 10 & 11 configuration?

It should be:

 [.......]

interface Port-channel10
 description VSL 1
 switchport
 switchport mode trunk
 switchport nonegotiate
 switch virtual link 1
!
interface Port-channel11
 description VSL 2
 switchport
 switchport mode trunk
 switchport nonegotiate
 switch virtual link 2

 [.......]

Add no cdp enable on each VSL interfaces (Te1/1/1 - Te1/2/8 - Te2/1/1 - Te2/2/8)

Check also with these commands:

SW1#sh switch virtual link  

SW1#sh switch virtual link port-channel

Best Regards,

If this helps, please rate.

Ben

[delpo40]

Thanks for your reply Ben.

Config is exactly as you describe:

interface Port-channel10
switchport
switchport mode trunk
switchport nonegotiate
switch virtual link 1

interface Port-channel11
switchport
switchport mode trunk
switchport nonegotiate
switch virtual link 2

There is a difference between show etherchannel summary:

10 Po10(SU) - Te1/1/1(P) Te1/2/8(w)
11 Po11(SU) - Te2/1/1(P) Te2/2/8(w)

..and show switch virtual link port-channels

 10 Po10(SU) - Te1/1/1(P) Te1/2/8(D)
11 Po11(SU) - Te2/1/1(P) Te2/2/8(D)

[M02@rt37]

Ok,

Do the logs show anything other than the interface going down ?

If you swap the working interface cable to the non working is it still the same?

What is the image used on 4500? IOS version?

Do you try an update?

Check this: https://bst.cloudapps.cisco.com/bugsearch/bug/CSCut09985/?rfs=iqvred

Best Regards.

If this helps, please rate.

Ben