We have two Arista 7504’s, each with a downstream-facing LAG into the same Cisco 7600-series router. Both were flat-lining around 10 Gbps, so thinking that perhaps it was the downstream router, we spread the traffic around by adding a fourth 10G to each LAG. Yet we’re flat-lining around the same value — adding that fourth LAG member made no perceptible difference.
What hashing distribution do you have on these links. Check with these commands, and provide the outputs:
What is your traffic profile:
If you have some imbalance, is there a high proportion of Multicast or Broadcast?
If it is mainly Unicast and unluckily get polarised onto the same link member, then maybe you can tune the hashing to bring more entropy.
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