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How to perform load balancing with two duplicate tachyon satellites on a cisco 3800 or 1811 router?

Posted on 2009-04-01
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Last Modified: 2013-12-24
I currently have 2 tachyon satellites feeding to a cisco router.  Each unit is connected to its own interface in the router (F0 and F1).  What would be the best and most efficient way to load balance the connection?  My network is flat and contains approx. 300 users.  
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Question by:oerigo
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by:tbarnes4962
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Assuming tachyons are wan facing CEF would be all you could use from cisco side, to achieve load balancing for this situation may require two cisco routers a switch and the GLBP protocol.
I am not familiar with tachyon sat modems, if they are capable of advanced routing protos you may only require a switch for you virtual ip address, but from a brief look at the tachyon site it appears they rely on other solutions for fail over capability.
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by:oerigo
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Would GLBP be an option?  I will have a single 3800 router with an interface assigned to each satellite.  Each satellite will have a pub Ip address?  But I want the traffic to be load balanced across the two links?  In addition I am also running nat internally.
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tbarnes4962 earned 500 total points
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If you only have the 3800 to work with then you might simply try IP CEF and set two default routes out
conf t
ip cef
!
ip route 0.0.0.0 0.0.0.0 f0 or next hop
ip route 0.0.0.0 0.0.0.0 f1 or next hop
!
end
wr
Cisco express forwarding will try to load balance and sometimes does not do to badly.
Your other option might be if your provider can offer bgp on the wan for you sat modems, not likely, other solutions ie. GLBP or MHSRP require additional hardware ( router, switch ).
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