Hi All,
I have strange problem with 2 * qfx5100 with mc-lag and irb + ospf
MC-LAG peers have configured static-arp on irb interfaces. Everything works ok. Vlans without IRB works as it should be.
But the problem is with vlans with IRB. When traffic goes from downlink host to IRB MAC of peer2.
Traffic goes like this:
downlink-host > to peer1 mc-lag over mcae > to peer2 (to MAC on IRB)over ICL
Packet gets to peer2 but when traffic comes from downlink-host to peer1, peer1 treat this as unknown unicast because don't know peer2 MAC.
Documentation says:
"The IRB MAC address of each MC-LAG peer is replicated on the other MC-LAG peer and is installed as a MAC address that has been learned on the ICL"
but my mc-lag peers dont know each other's IRB MAC's 
Any ideas?
I tried on JTAC recommended Junos14 and on Junos18 - didn't help
Configuration is very similar to this document: https://www.juniper.net/documentation/en_US/release-independent/nce/topics/example/multichassis-link-aggregation-ex9200-series.html
