[j-nsp] EX4200 ARP Issue

[Brendan Mannella]

Just wondering if anyone else has experienced anything like this before on the EX4200 platform. 



This morning users started complaining that there ips were flapping, they would work for 5 minutes then stop working for 5 minutes. What seemed to fix this issue was clearing the ARP table. This switch has all customer vlans and routes customer subnets. 



Another thing i noticed was... 



00:06:5b:f1:f0:72 "public ip here"            vlan.13      none 
00:06:5b:f1:f0:72 "public ip here"            vlan.13      none 
00:06:5b:f1:f0:72 "public ip here"        vlan.13      none 
00:06:5b:f1:f0:72 "public ip here"            vlan.13      none 
00:06:5b:f1:f0:72 "public ip here"            vlan.13      none 
00:06:5b:f1:f0:71 "public ip here"            vlan.13      none 
00:06:5b:f1:f0:72 "public ip here"            vlan.13      none 
00:06:5b:f1:f0:71 "public ip here"            vlan.13      none 





One customer has a firewall, and its outside interface has all the above ips assigned to it. Its outside interface has the :71 mac address. For some reason :72 is showing up and that is the firewalls inside interface. During this time, the ips attached to the :71 interface were working, the :72 were not. When i cleared the ARP, all ips had :71 again. 





I am running 9.3R4.4. Has anyone seen this, or have any ideas?