It depends on what PFC you have (thus what Sup you have).
If you have a Sup1A then you have a flow based PFC. Thus the first
packet of every new flow goes through the MSFC so that a flow entry can
be pushed down to the PFC.
If you have a Sup2 then you have a CEF based PFC. Thus almost no routed
traffic will pass through the MSFC.
The exceptions on both methods are any and all packets actually destined
to the routing engine (snmp, routing protocols, telnet, ICMP, ARP, etc.)
and any and all packets that need anything done to them other then
normal routing (TTL expire, options bits set, etc.).
I have yet to be able to confirm the assertion about CatOS 7.1 does
anything different.
David
-----Original Message-----
From: Dmitri Kalintsev [mailto:dek@hades.uz]
Sent: Tuesday, March 12, 2002 8:54 PM
To: cisco-nsp@puck.nether.net
Subject: Re: [nsp] unable to collect interface stats on 6905 MSFC2
On Fri, Mar 01, 2002 at 10:57:12AM -0800, Nash Darukhanawalla wrote:
> This is because the packets are L3 switched in the hardware by the
> PFC.
Related question: what traffic _is_ getting switched by MSFC? Is this
snmp/routing protocol/netflow export from msfc/cdp/telnet/ssh traffic to
or from MSFC itself or something more? If it is more, than what is it?
Is statement about 7.1 and visibility of MLS/SEF switched traffic on
msfc (when run in hybrid mode) true?
Thanks!
> Due to the CEF based architecture of the SUP2 / MSFC2, the MSFC2
> processes
> routing updates, creates FIB and ADj tables. These tables then get
> downloaded to the PFC hardware so that it can do local CEF lookups.
Sup2
> also maintains the Netflow table to provide flow statistics.
>
> Please refer to this document on configuring NDE to monitor L3
> switched
> traffic:
>
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/sw_6_3/confg
_gd/nde.htm
>
> Nash
>
>
>
> At 07:24 AM 3/1/2002 -0800, matthew zeier wrote:
>
> >I'm trying to run cricket against the Vlan interfaces on a 6905
> >"router" and have noticed that IfOutOctets and IfInOctets barely
> >incremenet, if at all. They do, however, if I query the switch but
> >often customers are spread across several switches/switch ports and I
> >wanted any easy way to grab inter-Vlan bandwidth.
> >
> >Running 12.1(8a)E2 and 6.3(3) .
> >
> >Any ideas?
> >
> >--
> >matthew zeier - "In mathematics you don't understand things. You
> >just get used to them." - Johann von Neumann
---end quoted text---
-- CCNP, CCDP (R&S) Dmitri E. Kalintsev CDPlayer@irc Network Architect @ connect.com.au dek @ connect.com.au phone: +61 3 9674 3913 fax: 9251 3666 http://-UNAVAIL- UIN:7150410 cell: +61 414 821 382
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