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Backup Router Routing Configuration

prestonhartley
Level 1
Level 1

       

Hello,

I am having a problem with my failover design.  I have a remote site with an MPLS connection with BGP between the PE and CE routers.  On the remote site I am running HSRP between the two routers, however there is no direct connection between the two routers, only through the layer 2 switch.  If need be, I can establish a direct link between the two routers.

The backup router has a connection to a Cable or DSL carrier, and has a VPN connection back in to the data center.  I am running EIGRP across the VPN tunnel and then redistributing those routes into another EIGRP system, and then finally into the BGP 65001.  My problem occurs when I do a failover over the MPLS connection at the remote site.  So my goal is to have the remote site be accessible from the MPLS cloud when the primary link at the remote site goes down.  When it fails the remote site is accessbile through the backup path but when the primary link is restored the traffic still travels down the backup path and not the MPLS connection.

Any thoughts on a better design setup or a way to make this work the way I want would be appreciated it.  If you have any questions please let me know.

Note: The top two routers in the picture above are in the data center, and the bottom two routers and switch are the remote site.

Primary Router in Data Center

router eigrp 1001

network 192.168.1.0 0.0.0.3

no auto-summary

!

router bgp 65001

network 10.2.0.0 mask 255.255.255.0

network 10.0.0.0 mask 255.255.255.0

redistribute eigrp 1001

!

Ip route 10.0.0.0 255.255.255.0 192.168.1.2 metric 200

VPN Router in Data Center

!

router eigrp 1001

redistribute eigrp 1000 metric 5000 1000 255 1 1500

network 192.168.1.0 0.0.0.3

no auto-summary

!

router eigrp 1000

network 10.0.0.0 0.0.0.255

no auto-summary

!

1 Reply 1

mfurnival
Level 4
Level 4

Hi,

I suspect the problem lies with your Primary router in the DC - it will learn about your remote site via EIGRP when the remote site MPLS goes down but then when the remote site MPLS comes back up it still favours the EIGRP routes. It would be useful to see a "show ip bgp" on the Primary DC router both before and after the failover.

You could apply a route map on the Primary DC router to apply a higher weight to routes learned via the MPLS cloud.