[EVPN VXLAN] Multi Homing : Vrouter dropping ARP packet from composite netxthop

When vrouter getting ARP packet from BMS behind composite next hop, packets are getting dropped with Invalid Nh. Using the vrouter with the fix for 1724681. When ARP has already learned Unicast ICMP packets are fine.

root@5b11s15:~# tcpdump -ni enp4s0f1 usp port 4789
tcpdump: syntax error
root@5b11s15:~# tcpdump -ni enp4s0f1 udp port 4789
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on enp4s0f1, link-type EN10MB (Ethernet), capture size 262144 bytes
13:38:13.848918 IP 172.16.3.1.10662 > 172.16.180.102.4789: VXLAN, flags [I] (0x08), vni 4
ARP, Request who-has 1.1.1.4 tell 1.1.1.3, length 42
13:38:14.849014 IP 172.16.3.1.10662 > 172.16.180.102.4789: VXLAN, flags [I] (0x08), vni 4
ARP, Request who-has 1.1.1.4 tell 1.1.1.3, length 42
13:38:15.848944 IP 172.16.3.1.10662 > 172.16.180.102.4789: VXLAN, flags [I] (0x08), vni 4
ARP, Request who-has 1.1.1.4 tell 1.1.1.3, length 42

root@5b11s15:~#
root@5b11s15:~# rt --dump 2 --family bridge
Flags: L=Label Valid, Df=DHCP flood, Mm=Mac Moved, L2c=L2 Evpn Control Word, N=New Entry, Ec=EvpnControlProcessing
vRouter bridge table 0/2
Index DestMac Flags Label/VNID Nexthop Stats
1708 2:20:4e:74:9a:cb - 30 74285
31264 0:0:5e:0:1:0 Df - 3 113527
40992 90:e2:ba:c4:2e:6c LDf -1 23 0 >>> BMS MAC
112924 ff:ff:ff:ff:ff:ff LDf 4 46 49864
242304 90:e2:ba:55:84:2d Df - 3 0
root@5b11s15:~# nh --get 23
Id:23 Type:Composite Fmly: AF_INET Rid:0 Ref_cnt:2 Vrf:2
              Flags:Valid, Ecmp, Etree Root,
              Valid Hash Key Parameters: Proto,SrcIP,SrcPort,DstIp,DstPort
              Sub NH(label): 50(4) 24(4)

Id:50 Type:Tunnel Fmly: AF_INET Rid:0 Ref_cnt:4 Vrf:0
              Flags:Valid, Vxlan, Etree Root,
              Oif:0 Len:14 Data:84 b5 9c c8 00 00 90 e2 ba 55 84 2d 08 00
              Sip:172.16.180.102 Dip:172.16.3.1

Id:24 Type:Tunnel Fmly: AF_INET Rid:0 Ref_cnt:3 Vrf:0
              Flags:Valid, Vxlan, Etree Root,
              Oif:0 Len:14 Data:84 b5 9c c8 00 00 90 e2 ba 55 84 2d 08 00
              Sip:172.16.180.102 Dip:172.16.2.1

root@5b11s15:~# dropstats | grep -v " 0$"
Invalid IF 8

Flow Action Drop 5720

Discards 3330
Cloned Original 7111

Invalid NH 2530
Invalid Mcast Source 2494

Invalid Source 108
No L2 Route 229210

root@5b11s15:~# dropstats | grep -v " 0$"
Invalid IF 8

Flow Action Drop 5720

Discards 3330
Cloned Original 7111

Invalid NH 2531
Invalid Mcast Source 2494

Invalid Source 108
No L2 Route 229210