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BGP Load Balancing

mautez_mah
Beginner
Beginner

Hi 
MY AS connected to two ISPs 
If I need to do load balancing to other sites ( per destination not per subnet ) 
I think about adding Max-path for outbound traffic, for inbound if I use a community to inform both ISPs will it work, ?
I read the article by cisco but it is all about balancing per Subnet, but I am talking about per destination,
anyone has any idea about it 

 
 
4 Replies 4

Joseph W. Doherty
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

I recall (?) PfR would do per-flow/destination (dynamic) load balancing on top of BGP.

Georg Pauwen
VIP Master VIP Master
VIP Master

Hello,

 

what does your topology look like, that is, how many routers do you have in your AS ? is this a single, multihomed router, or do you have multiple, local routers ?

@Georg Pauwen 
I have two cases,
first one: one router to two different ISP 
second one: two routers to two different ISP 

 
 

Hello,

 

in both cases, you can only do load sharing, not load balancing. Have a look at the configuration examples below:

 

Load Sharing When Multihomed to Two ISPs Through a Single Local Router

 

https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13762-40.html#anc21

 

Load Sharing When Multihomed to Two ISPs Through Multiple Local Routers

 

https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13762-40.html#anc26

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