Frank,

                I have been gradually implementing the unknown unicast rate limiting (starting with my own extension) to make sure it does not cause any unexpected problems.  I had not applied it to the route servers yet, so I can understand why you saw another blip when a member with a significant amount of traffic had their port go down unexpectedly today.

Jeremy

We saw another BFD event at 2:04 pm today – was there a disturbance in the force? 😉

And to follow up on my previous question, is Arista falling bit short in our situation, by not supporting a receive interval of 10 msec?

Frank

In this case it was BFD that kicked in – I have BFD only set up for the two route reflectors.  Other BGP sessions stayed up.

I also got this alert from our Arista 7504:

Apr 15 17:37:34 207.32.15.14 (sxct-north-2.sxcy.fbnt.netins.net) Bfd: %BFD-5-INCOMPATIBLE_RX_INTERVAL: Received a BFD rx interval from peer (vrf:default, ip:206.108.255.2 (AS53679-MRS-2.micemn.net), intf:Port-Channel2, srcIp:0.0.0.0, type:normal) of 10 milliseconds, outside of the supported range of 50-60000 milliseconds. (message repeated 3 times in 1.18783e+06 secs)

Is Arista falling bit short in this situation, by not supporting 10 msec?

Frank  

Frank,

Ideally it should not have, however what tends to happen is that when large ports go down the MAC addresses leave the table, and therefore the traffic gets flooded to all ports until BGP times out on the networks sending the traffic.  Since the route servers only have 1G ports, the 10G of traffic that typically is flowing to Belle Plaine probably saturated the route server ports for a short amount of time.  If you have short timeouts, or use something more sensitive like BFD I could see how your sessions dropped from the saturation.

Jeremy

We (AS18883) saw our BGP sessions with the MICE router reflectors bounce at that time – should that have happened?

Frank

Looks like the Zayo Belle Plaine remote went down at 5:37pm, I believe Lee @ SW MN Broadband is opening a ticket now.

From the MICE side we have light but no frames, and looking at other unrelated systems it appears the cut is South of Hwy 212 someplace.

Best of luck everyone,

Anthony

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