Per VLAN Stats on MSFC2 - Complaints from the Field

Robert A. Hayden rhayden at
Thu Nov 20 16:15:05 UTC 2003

Hey all,

This one is a weird one.  I apologize if this is a bit off topic.

As everyone is probably aware, the Cisco 6500/7600 line is unable to
provide per-vlan I/O statistics on routed interfaces (ie, a "show int vlan
xxx" has meaningless numbers in the I/O and error fields at the end).  
MIB tables also fail to provide meaningful data.  You CAN get some L2 VLAN
data, but that doesn't help you when you need to know what's going through
the router interface.

We've be going around and around with the vendor for a while now about how
this makes it pretty useless for traffic analysis, and even showed them
the RFC that requires that the information be made available to call it a
router.  Their latest tactic is to claim that "nobody else in the industry
is concerned about this shortcoming".

For us, we've been collecting routed interface stats going back all the 
way to 1996 and with our new gear we've been sold we find that our graphs 
are pretty empty and we get no reasonable information about how much 
traffic is passing through the L3 interfaces.

So, here's the question I have for anybody out there dealing with this 
hardware.  Is this shortcoming an issue for how you run your network?  
Have you asked Cisco to fix it?  My feeling is that a lot of people find 
it to be an issue and simply accept it is yet another broken cisco thing.

Please let me know privately.  I want to talk into our next meeting with
some printed testimonials from "real people" that this box is plain
broken.  Let me know as well if you don't want me to use your name and/or
organization in my report.

Thanks for your time.

- Robert Hayden
University of Wisconsin Madison

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