GLBP

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Mar 25th, 2009
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Hi,


How can I make load sharing via 2 routers with GLBP.


I configured GLBP in 2 routers, but they function in redundancy (Active/Standbay), not in load sharing( I mean Active/Active).


thnx

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i.ennassiri Wed, 03/25/2009 - 13:48
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thanks for your response.


let me explain the architecture that I want to implement.


My Lan is behind a PIX, I have 2 routers connected to 2 ISPs.

I configured GLBP in routers (I tried Round robin and weighted), and I added a default route in the PIX to the GLBP address.

I issue a tracert from many hosts in the LAN to Internet, the result is the same from all hosts.

Jon Marshall Wed, 03/25/2009 - 13:53
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Ah well then it won't load-balance. The issue you have is that the routers always see the same mac-address which is the mac-address of your firewall. So this mac-address will always be sent to the same router.


The mac-addresses of the hosts in the LAN are irrelevant because the routers only see the firewall mac-address.


Jon

Jon Marshall Wed, 03/25/2009 - 14:49
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The pix is not really designed to do load-balancing between 2 ISP's.


You can either


1) use a router on which you could implement PBR or have 2 default static routes


OR


2) if you want to use the pix then look into using OSPF between the pix and the 2 routers.


Jon

i.ennassiri Wed, 03/25/2009 - 15:23
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If I use 2 static routes in the PIX with the same metric, How it will manage the traffic?



Jon Marshall Wed, 03/25/2009 - 15:30
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The pix is not designed to handle 2 default routes with the same metric and load balance between the two. For that you need a router.


Like i say OSPF may be the only solution for you.


Jon

i.ennassiri Wed, 03/25/2009 - 15:36
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thanks for your assistance.


I will try to do it via OSPF, and I'll keep you in touch.



Jon Marshall Wed, 03/25/2009 - 15:37
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No problem, let me know how you get on.


Jon

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