[mrtg] Bandwidth monitoring of Cisco 3550 VLANs
Gilbert T. Gutierrez, Jr.
mailing-lists at phoenixinternet.net
Tue Sep 9 20:47:53 CEST 2008
I am trying to monitor the bandwidth of some VLANs on a Cisco CAT3550EMI
switch. I am terminating the VLANs L3 on this switch but am seeing no
traffic on reports I am generating. I know I have about 50-100kbps worth of
traffic flowing on the VLAN but I am getting reports of 60bps. I am
trunking to outside Layer2 switches so monitoring the physical port is not
an option. I have included a message below that I found on the web with the
same problem. Is the response on the included message the answer?
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
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
and I'm trying to monitor throughput of a given VLAN. The only thing
able to do right now is produce MRTG reports on VLAN showing
traffic -- as in 100 or below bits per second. (not kilobit -- BIT)
impossible as the actual port on the switch itself reports 600kbps.
VLAN attached to a given switchport doesn't seem to report that
I even tried changing MRTG to reference the switch's IP of a given
block -- still, no go.
This is starting to drive me nuts.
Anyone run into this, or have any suggestions?!
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.
Eric_Mailing_List at rednarb dot com
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