Hmmm, maybe I should just have my post to the list deleted then. The information that I posted is information I had been told about Cisco switches... Oh well, guess I need to finally go out and get my CCNA or something. Sorry for the mis-info.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, December 02, 2003 09:49 To: [EMAIL PROTECTED] Subject: [mrtg] Re: traffic on cisco switch VLAN interface } }What does the traffic on vlan interface shown by mrtg on cisco switches }means? Since VLAN is only a logical interface, it should not have any }traffic on it. It depends on which cisco product are you trying to use to count traffic with the vlan interface. IMHO, ideally a vlan interface would show _all_ the bytes in/out on that vlan, irrelevant of physical port (switchport mode) configuration. In my experience, this is not the case. Some of the cisco switches correctly count traffic per-vlan on the vlan interface counters, and some do not. I suspect that this has to do with flow switching where the first byte of each flow makes it up to the supervisor, but then everything after that happens in hardware. For the record, it appears that a 6509 running Native IOS 12.1.11bE4 counts per-vlan traffic stats correctly. However, a 2900xl-m running 12.0.5WC5 does not. As a general rule, I do not trust the vlan interfaces for accurate traffic stats. Nor do I trust them as port mirror/monitor/span sources. -- Attached file removed by Ecartis and put at URL below -- -- Type: application/ms-tnef -- Size: 1k (1965 bytes) -- URL : http://www.ee.ethz.ch/~slist/p/67-WINMAIL.DAT -- Unsubscribe mailto:[EMAIL PROTECTED] Archive http://www.ee.ethz.ch/~slist/mrtg FAQ http://faq.mrtg.org Homepage http://www.mrtg.org WebAdmin http://www.ee.ethz.ch/~slist/lsg2.cgi -- Unsubscribe mailto:[EMAIL PROTECTED] Archive http://www.ee.ethz.ch/~slist/mrtg FAQ http://faq.mrtg.org Homepage http://www.mrtg.org WebAdmin http://www.ee.ethz.ch/~slist/lsg2.cgi
