Symptom

ARP resolution is not working in ipv4 interworking scenario between Bundle & POS interface. "show netio drops" command is reporting drops on fint_l2transport with packet_null_action: fint_l2transport (l2transport decaps): packet_null_action -- 554 35456 Problem is specific to the Bundle interface only. When physical interface is used on Ethernet side, issue is not present.

Conditions

Interworking ipv4 configured between Bundle-Ether & POS interface: Example config: l2vpn xconnect group atom-any-to-any p2p VLAN101 interface POS0/0/0/0.101 interface Bundle-Ether1.101 interworking ipv4

Workaround

Issue is only affecting ARP resolution in ipv4 interworking scenario. Local switching in the bridge-domain is working without any problems. As a workaround, static arp entry might be configured on the device connected to the Bundle interface. BE interface MAC address should be used, for ex: IOS-XR side: RP/0/RSP0/CPU0:Router#show int bundle-ether 1.101 Thu Apr 23 11:59:22.388 UTC Bundle-Ether1.101 is up, line protocol is up Hardware is VLAN sub-interface(s), address is f025.72a7.ac3b <-- CE router side: Router(config)#arp xxx.xxx.xxx.xxx f025.72a7.ac3b arpa

Further Problem Description