[mrtg] Re: Cisco 3550/VLAN

[Darryl Kegg]

I noticed this as well and assumed that was the case, so for my VLAN stats I
use the sum of all the ports in a particular VLAN - it makes it difficult to
manage if your VLANs change membership frequently, but mine don't so it was
just a one-time setup.  Here's an example of the target line for my DMZ
VLAN, it is just 3 ports but it should give you the idea...

Target[17.2.12.10_DMZ]: 1:public at 17.2.12.10 + 2:public at 17.2.12.10 +
3:public at 17.2.12.10


-----Original Message-----
From: Eric Brander [mailto:Eric_Mailing_List at rednarb.com] 
Sent: Monday, March 22, 2004 10:58 AM
To: caleb at intruix.net; mrtg at list.ee.ethz.ch
Subject: [mrtg] Re: Cisco 3550/VLAN


----- Original Message ----- 
From: <caleb at intruix.net>
To: <mrtg at list.ee.ethz.ch>
Sent: Friday, March 19, 2004 2:30 PM
Subject: [mrtg] Cisco 3550/VLAN



I'm sure this question has been asked before, but from the posts I've seen,
no one seemed to really answer the question. We're running a Cisco 3550
Catalyst, and I'm trying to monitor throughput of a given VLAN. The only
thing that I'm able to do right now is produce MRTG reports on VLAN showing
extremely small traffic -- as in 100 or below bits per second. (not kilobit
-- BIT) This is impossible as the actual port on the switch itself reports
600kbps. But the VLAN attached to a given switchport doesn't seem to report
that traffic.

I even tried changing MRTG to reference the switch's IP of a given VLAN's IP
block -- still, no go.

This is starting to drive me nuts.

Anyone run into this, or have any suggestions?!

Thanks!

-Caleb
Intruix Tech, Inc.

-----

In my experience, it seems that Cisco reports traffic on a vlan that has
passed from one vlan to another.  Since all that traffic is on the same
vlan, it doesn't report that bit rate.  I was puzzled by this at first as
well, and never did get an official answer from Cisco.  However, I can tell
you that on my multi-vlan 4006 I get a large amount of traffic reported on
each vlan as a lot of data traverses back and forth across them all.  But on
my edge network switches, the vlan report shows next to nothing.

HTH,


Eric Brander
Eric_Mailing_List at rednarb dot com


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