Load Balancing

[prakalaathan]

hi,

can i get combined speed from two different isp 's?

for ex: isp1 2mbps + isp2  4mbps  = 6 mbps speed.

[sumit menaria]

Are you using BGP connectivity with the ISP or static routing.

There could be multiple ways to loadbalance traffic over two ISPs.

In BGP using selective Local preference(outgoing traffic) and AS path prepend(incoming traffic) etc and in in static routing using weight along with IP SLA.

However exact scenrio for example number of IP Pools you are using ,router ,routing protocol and the kind of traffic you want to load balance should be known.

[xthuijs]

You could use DMZ link bandwidth for this for instance.

this way you can import the same prefixes from both your peers and assign a lb weight of 1 vs 2 on both your provider links so that one flow for one prefixes goes to isp1 and 2 flows for one prefix to isp2.

great stuff!

here more detail:

https://supportforums.cisco.com/document/137306/asr9000xr-understanding-unequal-cost-multipath-ucmp-dmz-link-bandwidth-and-routes

xander