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Community Member

ASR1002 BGP load balance

I have an ASR1002 with up links to 2 different ISP's. There is a 200Mbps connection to ISP A and 65Mbps to ISP B. I am receiving full BGP routes from both ISP's. What is the best way to load balance between the asymmetric links? Thanks

6 REPLIES
VIP Super Bronze

Re: ASR1002 BGP load balance

You can use route-maps to divided your outgoing traffic to 2 different ISPs

have a look at this link with example

http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00800945bf.shtml#conf4

HTH

Reza

Community Member

Re: ASR1002 BGP load balance

hi,

Here we have to consider the bandwidth of the links, as you have mentioned  "There is a 200Mbps connection to ISP A and 65Mbps to ISP B".

you need to configure your ASR router to do the outbound load sharing based on the bandwidth. and for inbound traffic you can use AS prepand and make sure that 200 mbps is utilized more when comparing your 65 mbps link.

http://wiki.nil.com/EBGP_load_sharing

hope this help u

Regards,

Hariharan k

Community Member

Re: ASR1002 BGP load balance

To configure outbound load balancing on unequal links I should use the dmzlink-bw commands correct?

Community Member

Re: ASR1002 BGP load balance

yes , and also youshould configure maximum-paths number command

you can even propagate this link bandwidth information inside your AS.

http://cciethebeginning.wordpress.com/2009/01/19/bgp-link-bw-multipath-load-balancing/

Regards,

Hariharan k

Community Member

Re: ASR1002 BGP load balance

I tried to configure this today but ran into an issue - our one ISP uses the ebgp-multihop command. I get the following error when trying to enable the dmzlink-bw command: %BGP: Propagation of DMZ-Link-Bandwidth is supported only for single-hop EBGP peers

Here is our BGP config:

router bgp 14598

no synchronization

bgp log-neighbor-changes

network 192.245.xx.0

neighbor 64.56.37.xx remote-as 13385

neighbor 64.56.37.xx ebgp-multihop 5

neighbor 74.212.15.xx remote-as 3593

neighbor 74.212.15.xx fall-over

no auto-summary

Any thoughts on how to load balance this with the multihop?

VIP Super Bronze

Re: ASR1002 BGP load balance

DMZ-Link-Bandwidth is only supported on directly connected EBGP links.

May be you can negotiate with your provider to change the peeing from loopback interface to physically connected interface

http://www.cisco.com/en/US/docs/ios/12_2t/12_2t11/feature/guide/ft11b_lb.html#wp1059961

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