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New Member

ifDescr of Vlan sub interfaces

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.

Cisco Employee

Re: ifDescr of Vlan sub interfaces

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".

New Member

Re: ifDescr of Vlan sub interfaces

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


Cisco Employee

Re: ifDescr of Vlan sub interfaces

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.