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phaap
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Joined: Mon Nov 12, 2012 11:13 pm

OSPF failover between 2 site-to-site links

Mon Nov 12, 2012 11:28 pm

Hi,
I'm looking at using ospf to distribute routes and do failover/failback on 2 site-to-site links.
OSPF does not work, probably because I have no control over the provider CPE-routers on the MPLS-link.

So OSPF only works on the wireless link, not on the MPLS. If WIFI fails, traffic does not fail over to MPLS...

Is there a possible work-around or other solution appart from OSPF?

This is a drawing of the setup.
wan_link.jpg
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controlc
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Re: OSPF failover between 2 site-to-site links

Thu Nov 15, 2012 11:29 am

Can't you create an EoIP tunnel between 192.168.103.1 and 192.168.104.1, via the MPLS, then run OSPF over that?
 
physon
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Re: OSPF failover between 2 site-to-site links

Fri Nov 16, 2012 5:14 am

The MPLS is layer 3? You would need to tunnel across it to form a second adjacency between router 1 and router 2. OSPF only works on layer 2.
 
phaap
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Re: OSPF failover between 2 site-to-site links

Sun Nov 18, 2012 4:01 pm

Hi,
I did exactly that: added a eoip tunnel (192.168.105.1/192.168.105.2) over the mpls.
OSPF now works perfectly over both links!

Thanks a lot for the suggestion!
 
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wulfgard
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Re: OSPF failover between 2 site-to-site links

Thu Nov 22, 2012 10:32 pm

you might not need EOIP
try using PointToPoint in ospf configuration and ensure MTU is the same on both sides of the mpls network
even if EOIP works it is better not using it because of MTU overhead

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