Re: unknown unicast on QFX5100 mc-lag irb

My configuration is very similar to this one: 

http://jncie.tech/2017/07/30/mc-lag-lab-advanced-irb-functionality/.

But I narrow the searching.  I have no idea why why 2 MC-LAG nodes dont know each others irb MACs.  They have proper static arp entries on irb interfaces and communicate. 

Please help

############################## 
# irb static arp
##############################

bartek@switch-e9-juniper-qfx5100> show configuration interfaces irb.1000 family inet 
mtu 1500;
address 10.0.1.9/24 {
    arp 10.0.1.8 l2-interface ae1.0 mac e8:b6:c2:8b:f2:80 publish;
    vrrp-group 100 {
        virtual-address 10.0.1.10;
        priority 109;
        accept-data;
    }
}

bartek@switch-f8-juniper-qfx5100> show configuration interfaces irb.1000 family inet 
mtu 1500;
address 10.0.1.8/24 {
    arp 10.0.1.9 l2-interface ae1.0 mac e8:b6:c2:8b:fc:80 publish;
    vrrp-group 100 {
        virtual-address 10.0.1.10;
        priority 108;
        accept-data;
    }
}

############################################## 
# irb MACs
##############################################

bartek@switch-e9-juniper-qfx5100> show interfaces irb | match Hardware                  
  Current address: e8:b6:c2:8b:fc:80, Hardware address: e8:b6:c2:8b:fc:80

bartek@switch-f8-juniper-qfx5100> show interfaces irb | match Hardware                  
  Current address: e8:b6:c2:8b:f2:80, Hardware address: e8:b6:c2:8b:f2:80

########################################### 
# ping works, ospf works and everything seems to be ok, but it is not
##########################################

bartek@switch-e9-juniper-qfx5100> ping 10.0.1.8 count 2    
PING 10.0.1.8 (10.0.1.8): 56 data bytes
64 bytes from 10.0.1.8: icmp_seq=0 ttl=64 time=8.368 ms
64 bytes from 10.0.1.8: icmp_seq=1 ttl=64 time=19.129 ms

--- 10.0.1.8 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max/stddev = 8.368/13.748/19.129/5.381 ms

############################################
#static arp entry looks ok
########################################

bartek@switch-e9-juniper-qfx5100> show arp hostname 10.0.1.8 
MAC Address       Address         Name                      Interface               Flags
e8:b6:c2:8b:f2:80 10.0.1.8        10.0.1.8                  irb.1000 [ae1.0]        permanent published

bartek@switch-e9-juniper-qfx5100> show route forwarding-table all | match 10.0.1.8             
10.0.1.8/32        dest     0 e8:b6:c2:8b:f2:80  ucst     1794     1 ae1.0

############################################
# the problem is that peers dont know each others mac addresses :(
###########################################

bartek@switch-e9-juniper-qfx5100> show ethernet-switching table | match e8:b6:c2:8b:f2:80 

{master:0}
bartek@switch-e9-juniper-qfx5100>