[c-nsp] OSPF equal cost load balancing

Patrick Cole z at amused.net
Thu Aug 31 21:02:15 EDT 2017


Interesting you should mention the PPPoE thing as all of our ASR920 P/PE are 
deployed using BDI for NNI facing interfaces and we carry bucketloads
PPPoE traffic across them all without any issues.

The only thing I had to be weary of was accidentally putting two service
instances in the bridge domain for the NNI IP interface as it would spit a
ASIC programming error for FRR and start blackholing some labeled traffic.
But as long as you're meticulous about that it seems fine.


Thu, Aug 31, 2017 at 09:12:05AM +0100, James Bensley wrote:
> > We're going to be in the same boat soon too.. ASR920's on both sides with
> > OSPF across two physical paths and worried about load sharing. Most of our
> > traffic is MPLS xconnects traversing these links (licensed backhauls).
> This doesn't sound like a good idea to me (depending on your traffic
> requirements). I have had mixed results when using BDIs/SVIs for core
> MPLS facing interfaces, as an example, PPPoE frames wouldn't forward
> over a pseudowire when the ASR920 used a BDI for the for interface:
> https://null.53bits.co.uk/index.php?page=mpls-over-phy-vs-eff-bdi-svi
> Cheers,
> James.
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Patrick Cole <z at wwwires.com>
Senior Network Specialist
World Without Wires
PO Box 869. Palm Beach, QLD, 4221
Ph:  0410 626 630

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