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Cisco GLBP and host-dependent load sharing

Posted on 2011-09-30
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Last Modified: 2012-06-27
Hello.

I have a question about Cisco GLBP and the 'host-dependent' configuration option (as opposed to round-robin).

With host-dependent load sharing configured
   eg
glbp 10 load-balancing host-dependent

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...I understand from the documentation that it uses the host MAC address, to fix a host to a specific GLBP router (AVF), but what exactly about the MAC address does it base its calculation on? Is it a simple odd/even (ie for a 2-node GLBP group, do MACs ending in 1,3,5,7 use one gateway, and 2,4,6,8 use the other) or something else?

My scenario is that we have 2 WAN link routers configured in a GLBP group, currently set to the default round-robin mode. Behind these we have 4 host devices, of which 2 have significantly higher bandwidth requirements than the other 2 - so we want to ensure that the 2 high usage ones are kept on separate links so they dont interfere with each other.

Obviously we could just enable the 'host dependent' setting and see what happens, but i very much prefer to know what will happen before making these changes (and unfortunately we do not have spare equipment capable of doing a test-lab equivalent setup at this time).

Many thanks in advance for answers to this one.

Note: I know we could use other approaches such a multiple HSRP groups, however GLBP is fixed in this case, so i need advice regarding GLBP specifically, thanks.
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Question by:rog2054
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Craig Beck earned 2000 total points
ID: 36894674
Have a look at this... (it explains better than me!) :-)

http://cisconinja.wordpress.com/2009/02/11/glbp-weights-load-balancing-and-redirection/
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by:rog2054
ID: 36897505
Hi Craigbeck. That is an excellent tutorial you provided a link for, and it helped to answer my question (and fill in a few other gaps in my knowledge regarding GLBP)

Thank you.
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