@Doods:
Looks like R4 didn't learn R2's mac-address
root@R2# run show arp no-resolve MAC Address Address Interface Flags 56:68:28:3d:5c:5f 10.233.240.2 fxp0.0 none 56:68:28:3d:5c:5f 10.233.244.2 fxp0.0 none 56:68:28:41:89:cc 10.233.255.254 fxp0.0 none 00:05:86:71:32:00 172.27.0.1 ge-0/0/0.0 none 00:05:86:71:33:00 172.27.0.6 ge-0/0/1.0 none Total entries: 5 [edit] root@R2# run show chassis mac-addresses MAC address information: Public base address 00:05:86:71:18:00 Public count 960 Private base address 00:05:86:71:1b:c0 Private count 64 root@R4# run show arp no-resolve MAC Address Address Interface Flags 56:68:28:3d:5c:5f 10.233.240.2 fxp0.0 none 56:68:28:3d:5c:5f 10.233.244.2 fxp0.0 none 56:68:28:41:89:cc 10.233.255.254 fxp0.0 none 00:05:86:71:35:c0 172.27.0.10 ae0.0 none 00:05:86:71:63:00 172.27.0.17 ge-0/0/1.0 none 00:05:86:71:99:00 172.27.0.22 ge-0/0/5.0 none Total entries: 6 [edit] root@R4# run show chassis mac-addresses MAC address information: Public base address 00:05:86:71:33:00 Public count 960 Private base address 00:05:86:71:36:c0 Private count 64