BGP Load Balancing

cisco_nerd

Hi,

Just wondering if someone could help me understand the configuration to enable load balancing across multiple BGP peer connections.

At present I am labbing a topology that has a single edge router that connects to three external sites via GRE tunnels through the cloud, and forming BGP neighbour relationships. These three sites are would be three different entry points into a common network.

I guess in essences its more or less multihoming through three different GRE tunnels to a common network if that makes sense.

I have it configured at the moment so that one tunnel is the primary with the other 2 on standby essential as a first and second line redundancy should the other fail. Is there a way though to have all three tunnels route traffic to improve WAN bandwidth utilisation just as you could internally with EIGRP?

BGP is still relaltively new to me so apologies is this is a trivial matter.

Thank you TE!!

keenon

got a drawing of it? I have an idea but i wanted to be sure about it. at first read it sounds like

10.0.0.0
- A -
/ | \
- B C D -
| | |
10.1.0.0

cisco_nerd

For the most part, your correct that is pretty much excatly how the topology would look.

I have attached a quick draw up I did in GNS3 to illustrate the logical connectivity.

keenon

its almost like you would have to run an IGP over the tunnel to load balance from all the sites. since your running bgp i could see advertising a subsets of the routes from B, C and D and all have a summary covering all for failover in the event of either B, C or D failing.

fredrikjj

This is probably what you are looking for:
Load Sharing with BGP in Single and Multihomed Environments: Sample Configurations - Cisco

cisco_nerd

Thanks alot for the help!