Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

UCS Dis-jointed L2 Domain and overlapping VLAN 1

I just deployed a UCS environment where we needed to configure dis-jointed L2 domains. The L2 domains have different VLANs and uplink port channel on each FI. I used VLAN Groups to map VLANs to their appropriate uplink port channels.

Everything is working as expected but there are these hidden faults that can only be viewed by selecting the show all option in the fault log.vlans.JPG

I can see from NX-OS that the only overlapping VLAN is VLAN 1

Po10          1,5,99-101,400,700,802,806,809,814,818,990

Po12          1,103-106,150

interface port-channel10

  description U: Uplink

  switchport mode trunk

  pinning border

  switchport trunk allowed vlan 1,5,99-101,400,700,802,806,809,814,818,990

  speed 10000

interface port-channel12

  description U: Uplink

  switchport mode trunk

  pinning border

  switchport trunk allowed vlan 1,103-106,150

  speed 10000

Is there any way to remove VLAN 1 from the allowed vlan list?

1 REPLY
Cisco Employee

UCS Dis-jointed L2 Domain and overlapping VLAN 1

What is the firmware version running?

Did that start to happen after an upgrade?

What is the native vlan?

You could be hitting this defect:

https://tools.cisco.com/bugsearch/bug/CSCuh76091

CSCuh76091 - VLAN 1 always listed as overlapping in disjoint L2 setup

Symptom:
During the configuration of a disjoint L2 topology you'll get the following error message:
"Port: 1/11 following overlapping VLANs detected: 1"
Conditions:
Disjoint L2 setup and default vlan 1.
Workaround:
N/A.
Setting  the vlan you allowed on the separate uplink as "native" still results  in vlan 1 being added to the interface configuration.
More Info:

On this defect, the issue is cosmetic.

1861
Views
0
Helpful
1
Replies