[c-nsp] Dual homed EIGRP CE MPLS connection

Andrew Miehs andrew at 2sheds.de
Thu Dec 15 17:39:49 EST 2011

Hi all,

I am currently fighting with the "correct" way to attach an third party managed dual homed internal customer to our mpls backbone. (See below for diagram)

Due to license costs we have decided (and I am starting to regret it) using EIGRP between the "customer" CEs (6500s) and our two PEs(asr1001s) we have located at their location.

The links between the PEs and CEs are ethernet with 802.1Q trunks for the different VPNS/ VRFs.

As there is a third party managing the CEs would would like to protect our network and theirs as best we can by only configuring the PEs.

I am currently using "distribute-list prefix in" on the PES to protect EIGRP process. Without this, the "other" PE will end up learning the default route via EIGRP from the first PE.

I am also worried about the backdoor link being ignored as I have currently not configured site of origin. I am also thinking about tagging the BGP routes I export to EIGRP to ensure that they are not re-imported on the PE itself, or the "other" PE.

Is there a "correct/ cisco way" of doing this? I have been checking the documentation, but haven't found a "complete" solution.

I have set up the config below in GNS3 - and I hope it reacts close to what the real boxes will do later in my lab.

Thanks for any comments/ suggestions,


PS: and use eBGP is not helpful :)

The routers and switches are connected as below with 2x 1G WAN links, and 1G ethernet between PsE and CEs

    |   \         /   |
    |    \       /    |
    |     \     /     |
    |      \   /      |
    |       \ /       |
    |        \        |
    |       / \       |
    |      /   \      |
    |     /     \     |
    |    /       \    |
     pe1           pe2
      |             |
      | 1G WAN      | 1G WAN
         MPLS CLOUD
              ------------Default from cloud for CUST1 vrf

Currently I have configured (simplified meta config)

router eigrp 1
 address-family ipv4 vrf CUST1 autonomous-system 10
  redistribute bgp 65000 metric 100000 10 255 1 1500
  distribute-list prefix CUST1IN in
router bgp 65000
 address-family ipv4 vrf CUST1
  no synchronization
  redistribute connected
  redistribute eigrp 10

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