[mrtg] Re: Port-channel subinterfaces on Catalyst 4232-L3 blade?

Daniel J McDonald dmcdonald at digicontech.com
Mon Oct 15 17:08:45 MEST 2001

>We have a Catalyst 4006 with a 4232-L3 blade.  Since the 4232 blade can
>see five ports, two gig ports on the front and two connected to the switch
>fabric and a single 10/100 on the front, you have to use the internal gig
>ports as VLAN trunks.  This leads to routing off of dot1q tagged
>sub-interfaces of the gigabit etherchannel (eg, port-channel1.100, etc).

>Trouble is, I don't see a snmp interface entry for these sub-interfaces,
>unlike serial interfaces with per-PVC subinterfaces.  I see the gig
>etherchannel, but not the VLAN subinterfaces.

The 4232 blade only supports dot1q, so you are completely out of luck.  Very
recent version of IOS support ISL subinterfaces (12.1.3T and later, 12.1.5E
and later).  Still no word from Cisco on integrating dot1q interfaces (see
bug CSCds00250)
The 4232 blade uses a fairly obscure branch of code (12.0W) so I wouldn't
expect to see anything on that platform for a long time.  Nor are there any
other hacks that you can use to gather the information, like CAR...

Daniel J McDonald, CCIE 2495, CNX
Principal Network Specialist
Digicon Technologies

Digicon, a Cisco Partner, Silver Certified.

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