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eigrp default route to the Internet

Posted on 2014-02-20
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Last Modified: 2014-03-07
I have a MPLS connection for all of my sites. Each of my 2 main sites router has an Internet connection (separate from the MPLS), and each advertises its default gateway to the remotes.
So one of my remotes has the following route via eigrp:
D*EX 0.0.0.0/0 [170/30720] via 10.10.10.10, 7w0d, FastEthernet0/0
                        [170/30720] via 10.10.10.20, 7w0d, FastEthernet0/0

Does it mean that it load balance between the 2 main site (10.10.10.10 & 10.10.10.20)? How does it send traffic to the Internet? Thanks
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Question by:leblanc
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Expert Comment

by:mikebernhardt
ID: 39874441
Yes, it load balances by default. Since you're advertising a default route, all traffic would go back the main site router and then back out that internet connection. Is that what you want?

If you want to remote sites to use their own internet connections for internet then you have to filter that default route so that only internal routes are advertised to the remote sites over the VPN.
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by:leblanc
ID: 39874461
No that is fine. So each of the remote sites will have two routes to get to the Internet, how will this work? Is it load balance on packet or traffic flow? Thanks
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by:mikebernhardt
ID: 39874523
It should be packet-based, as EIGRP doesn;t know anything about flows. But MPLS may set its own rules regardless of EIGRP.
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by:leblanc
ID: 39874752
I am looking at the last resort to 0.0.0.0 and it says that it is going to 10.10.10.10. So it is not really load balance.
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mikebernhardt earned 500 total points
ID: 39874988
It will pick one for that statement in the routing table output, but you might actually see it change from time to time. The 2 equal-cost paths are going to be shared by default in EIGRP regardless of that last resort output. Under "router eigrp" you can specify "maximum-paths" but by default I think it's 4.
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