From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Fri Sep 05 2003 - 00:55:19 GMT-3
Meng,
CEF is a switching path. You still need a regular IP route for
your destination so you can do an IP lookup.
Regarding the load balancing, it depends on the hardware.
Packets software switched on the MSFC can be load balanced per packet,
but packets hardware switched on the PFC cannot.
Per packet load balancing is really only advantageous on lower
speed links, and since load balancing on the PFC is per flow
(source/destination pairs), and not just per destination, you rarely run
into a case where common traffic patterns become your enemy.
Regardless, the simplest solution is still just two default
routes. Meng, why can you not use static routes?
For more info on 650x switching paths and CEF:
"Configuring IP Unicast Layer 3 Switching on Supervisor Engine 720"
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/122sx/swcg/c
ef.htm#1142701
"Load Balancing with CEF"
http://www.cisco.com/warp/public/cc/pd/ifaa/pa/much/prodlit/loadb_an.htm
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-334-8987
Direct: 708-362-1418 (Outside the US and Canada)
-----Original Message-----
From: asadovnikov [mailto:asadovnikov@comcast.net]
Sent: Thursday, September 04, 2003 10:22 PM
To: 'Brian McGahan'; 'zhang-meng'; 'Ccielab (E-mail)'
Subject: RE: Cisco 6506 and BGP problem
I am not all that sure that 6506 would actually support per-packet. It
somewhat depends on what supervisor hardware it is though. There are
couple
hardware options on it as well, but not per-packet. Good new is that
you
probably would not need per-packet anyway.
It was almost a year since I played with it, so my memory may be failing
me.
Best regards,
Alexei
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Brian McGahan
Sent: Thursday, September 04, 2003 1:18 PM
To: 'zhang-meng'; 'Ccielab (E-mail)'
Subject: RE: Cisco 6506 and BGP problem
Meng,
Why not just put two static default routes? With CEF you can
load
balance between these routes on a per-packet or per-destination basis.
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-334-8987
Direct: 708-362-1418 (Outside the US and Canada)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
zhang-meng
Sent: Thursday, September 04, 2003 4:02 AM
To: Ccielab (E-mail)
Subject: Cisco 6506 and BGP problem
Hi: Group
A problem, I want to use 6506 (with layer 3 function) to connect
with
two ISP(using two 1000BaseT port) load balance, but Tel can't support
BGP,
they worried statibility.
What kinds of solution and Could you give some suggestion and
design.
Regards
Meng Zhang
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