MPLS - GRE tunnel routing problem

Unanswered Question
Jun 6th, 2008
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The problem we have is that the GRE tunnel becomes the primary route when both ciruits are up. EIGRP sees it as a better route over our MPLS circuit.

At the moment we have passived the tunnel interface, but this then doesn't give us the automatic failover we require.

Is there a way that I can make EIGRP see the MPLS circuit as the primary one?

Your help will be much appreciated.

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Check your bandwdith and delay settings in your GRE tunnels.

Make your MPLS tunnel the best route from both sides, something like:=

MPLS tunnel

Bandwdith 10240 = 10mbs or whatever the circuit speed is.

delay 500000

Backup tunnel

Bandwidth 10240 = = 10mbs or whatever the circuit speed is.

delay 1000000

With the above - EIGRP will choose the MPLS as it has a lower delay = better route.

These settings must be used at both ends - otherwise you will have asymetric routing, the traffic will go over the MPLS and return on the backup.


standardbankcco Fri, 06/06/2008 - 02:53
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We have tried this, without any effect.

I believe it is do with getting the route internally over the tunnel, but externally accross the MPLS link.

sh ip route

Routing entry for

Known via "bgp 65011", distance 20, metric 0

Tag 2006, type external

Redistributing via eigrp 100

Advertised by eigrp 100 metric 64 20000 255 1 1500 route-map IST_MPLS_Networks_in

Last update from 04:23:52 ago

Routing Descriptor Blocks:

*, from, 04:23:52 ago

Route metric is 0, traffic share count is 1

AS Hops 2

Route tag 2006


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