[c-nsp] OSPF equal cost load balancing

Pshem Kowalczyk pshem.k at gmail.com
Wed Aug 30 16:51:20 EDT 2017

Are you running L2VPN traffic across those ECMP links?

kind regards

On Wed, 30 Aug 2017 at 16:59 CiscoNSP List <CiscoNSP_list at hotmail.com>

> Hi Everyone,
> Have an ASR920 connected to an ME3600 with 2 x 1Gb links with same ospf
> cost (It was a single 1Gb, but secondary 1Gb was added as utilization was
> getting close to 1Gb) - Was hoping for at least a partial balance of
> traffic across the 2 links, but egress from ASR920 to the ME3600(Ingress to
> customers), we are seeing one of the 1Gb links basically maxing out, and
> the other doing virtually nothing (10-15Mb/sec)...other direction we are
> seeing pretty much 50:50 balance across the 2 x 1Gb links....I know
> per-dest algorithm is used, and know that there are a only few big
> bandwidth users on the ME3600, but I cant understand why basically "all" of
> the traffic is going down one link?
> Is there anyway to "tweak" the load-sharing of the equal cost paths (I can
> only see per-dst as an option)
> Is a L3 etherchannel going to be any "better" with load-balancing than the
> current ospf equal cost?  (we have voip running over these links, so want
> to avoid packet delivery order issues)
> Is TE a potential solution in this case?
> We cant go 10G unfortunately, as the ME3600's dont have 10G ports
> unlocked, and they are earmarked for retirement - so stuck with multiple 1G
> links for a short-term fix 😞
> Appreciate any feedback/suggestions.
> Thanks
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