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Webcast-Catalyst9k
New Member

CEF on 6506 load-balancing: unexpected behaviour

Hello everybody;

I have enabled CEF with per-destination load balancing on 6506 MSFC2 with PFC2.

I see an unexpected behaviour. There are 5000 entries in the routing table and 4 available next-hops.

I see an unequal distribution of traffic between the links:

Interface IHQ IQD OHQ OQD RXBS RXPS TXBS TXPS TRTL

------------------------------------------------------------------------------

* FastEthernet3/1 0 0 0 0 2137000 1250 129000 198 0

* FastEthernet3/2 0 0 0 4290 1985000 1380 12032000 3613 0

* FastEthernet3/4 0 0 0 0 1429000 1088 308000 489 0

* FastEthernet3/9 0 0 0 6764 1250000 949 9823000 2783 0

======================

Why there are these big differencies?

Many thanks

1 ACCEPTED SOLUTION

Accepted Solutions
Silver

Re: CEF on 6506 load-balancing: unexpected behaviour

6500 uses hardware switching, or MLS CEF to switch packets, not regular software CEF.

MLS CEF will do similar load-sharing as software CEF, except by default it will unequally share load when there is an even number of equal-cost paths.

If you want to change this behavior, configure 'mls ip cef load-sharing simple'

2 REPLIES
Silver

Re: CEF on 6506 load-balancing: unexpected behaviour

6500 uses hardware switching, or MLS CEF to switch packets, not regular software CEF.

MLS CEF will do similar load-sharing as software CEF, except by default it will unequally share load when there is an even number of equal-cost paths.

If you want to change this behavior, configure 'mls ip cef load-sharing simple'

New Member

Re: CEF on 6506 load-balancing: unexpected behaviour

Hi William,

I've tried to apply ''mls ip cef load-sharing simple'' but it's non supported on my platform.

I've instead applied 'mls ip cef load-sharing full' and now load balancing works fine!!

Any suggestion about? What is the difference between the option 'simple' and 'full'?

Many thanks for your support

King Regards

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