We have a Cisco C2960S running 12.2(55)SE3 that Observium insists has a whole bunch of VLANs that don’t actually exist on the switch.

 

The VLANs (No Graphs) screen, for example, shows:

VLAN	Description	Other Ports
Vlan 1	default	Vlan1(U), Gi1/0/25(U), Gi1/0/26(U), Te1/0/1(U), Te1/0/2(U)
Vlan 2	ccey	Te1/0/1, Te1/0/2
Vlan 3	ccmy	Te1/0/1, Te1/0/2
Vlan 4	me	Te1/0/1, Te1/0/2
Vlan 5	Hermes-Uwrtr1	Te1/0/1, Te1/0/2
Vlan 6
Vlan 9	firewall	Te1/0/1, Te1/0/2
Vlan 10
Vlan 90	VLAN0090	Te1/0/1, Te1/0/2
Vlan 91
Vlan 99	ITC-Office-Inside	Te1/0/1, Te1/0/2

 

…but VIDs 6, 10 and 91 don’t actually exist on this device:

 

UMTor1#show vlan id 6

VLAN id 6 not found in current VLAN database

UMTor1#show vlan id 10

VLAN id 10 not found in current VLAN database

UMTor1#show vlan id 91

VLAN id 91 not found in current VLAN database

 

I have manually re-run discovery, successfully.

 

Every bogus VID strictly follows a valid VID, i.e. 5 is valid, 6 is not.  9 is valid, 10 is not.  90 is valid, 91 is not.  And so on.

 

Anyone else run into this?

 

Any ideas how to troubleshoot this?

 

Thanks,

-Adam

 

Adam Thompson
Consultant, Infrastructure Services

100 - 135 Innovation Drive
Winnipeg, MB, R3T 6A8
(204) 977-6824 or 1-800-430-6404 (MB only)
athompson@merlin.mb.ca
www.merlin.mb.ca

 

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