BGP load sharing

Unanswered Question
Sep 13th, 2007

As you see from picture i have 2 AS connected to each other via 2 PLCs (Link1 and Link2 both 6Mbps).

Flows from Net1 to|from Net5&Net6 and Net2 to|from Net5 are very high bandwith consuming. I want to use

load sharing for traffic-

Link 1 - Net1-Net5

Net1-Net6

Net8-voice-Net7-voice

Link 2 - Net2-Net5

Net4-voice-Net7-voice

Using BGP i can advertize Net8-voice via R2 (Link2) with AS-path prepend and path to that net from AS6533 will prefered via Link1.

Same for Net4-voice - it will prefered via Link2.

But how to be for Net7-voice? How to advertize it to AS 65334?

And in the same situation Net5 in AS65333. How to advertize it to AS65334 and flows from Net1 uses Link1 for access to Net5 and flows from Net2 uses Link2 for access to Net5?

I have this problem too.
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Pavel Bykov Fri, 09/14/2007 - 00:18

Why not let standard BGP load-balancing do it's work? Have you tried normal load-balancing and see how load is distributed over links? If it's going to be distributed about equally there is not much point in defining complex mechanisms.

Also, normally data is separated from voice when there is no QoS, to provide a better QoS service.

Normally, you would load balance as per this document:

http://www.cisco.com/en/US/customer/tech/tk365/technologies_configuration_example09186a00800945bf.shtml#conf3

But because mentioned example is complex, i think PBR is the solution

http://www.cisco.com/en/US/customer/docs/ios/12_0/qos/configuration/guide/qcpolicy.html#wp4553

Hope this helps.

rmv72 Fri, 09/14/2007 - 01:11

Do you think that load balancing is possible in that case?

I've seen first link and that's why i told about load sharing.

Do you think PBR is best solution?

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