[c-nsp] balancing load 4 static routes

[Tim Stevenson]

This is probably a side-effect of the h/w implementation of CEF 
load-sharing on even paths in PFC3. An extra adj entry in h/w is 
assigned to one of the paths.

You can disable this behavior with mls ip cef load-sharing simple. 
However, be aware that this introduces the possibility of CEF 
polarization in a multi-stage routed network.

Tim

At 04:52 AM 4/2/2006, Bas exclaimed:
>Hi all,
>
>On a sup720 running sxf4 I have a BGP session with a peer between
>loopback addresses. There are four static routes pointing to the
>loopback address of the peer.
>
>For some reason one of the 4gige interfaces is loaded twice as much as
>the other interfaces.
>When I shut this interface traffic is balanced over three remaining
>interfaces evenly.
>
>sh ip cef <peer-ip> shows all four entries.
>
>Is there some kind of algorithm causing this?
>
>Thanks
>
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Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Technical Marketing Engineer, Catalyst 6500
Cisco Systems, http://www.cisco.com
IP Phone: 408-526-6759
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