ifDescr of Vlan sub interfaces

Unanswered Question
Mar 24th, 2008

I have Cisco router Model Cisco 3825 IOS 12.4(3b) System Bootstrap, Version 12.3(11r) T2, RELEASE SOFTWARE (fc1).

ifDescr (SNMP oid in mib2) of one of VLAN sub interface is

“GigabitEthernet0/0.445.1Q vLAN subif”

Now I have upgraded its IOS to IOS 12.4(9t).

ifDescr of same interface is now “GigabitEthernet0/0.445”

Due to this change my monitoring tool is not discovery this interface.

In all previous IOS versions ifDescr of VLAN sub interface contains “vLAN” string. So I want to know why this change in ifDescr done by Cisco. Will all next IOS versions will follow this change.

Or is there any way to change ifDescr of interface.

I have this problem too.
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Joe Clarke Mon, 03/24/2008 - 09:09

This was changed as part of the fix for CSCsg40639. If you want the old ifDescr back, use the global config command, "vlan ifdescr detail".

anandmirasdar Wed, 03/26/2008 - 03:48

I have tried your solution but it is not working

Looks this command (vlan ifdescr detail ) does not exist on his router?


NAT-PSB-WAN1#conf t

Enter configuration commands, one per line. End with CNTL/Z.


NAT-PSB-WAN1(config)#vlan if ?

% Unrecognized command

NAT-PSB-WAN1(config)#vlan ifdescr ?

% Unrecognized command


Joe Clarke Wed, 03/26/2008 - 10:18

Sorry. I had thought it was introduced with the VLAN change. However, you will need to upgrade to 12.4(15)T to get this command.


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