Hi
Following problem: I configured VRF-lite on Catalyst 3750x. Its working fine but now i have a strange behavior. If a Device, who is connected to the switch has to be replaced and the new device has the same fix IP address as the old one, the device is unrechable. The age Time in the arp table points to the replacement time but the mac address is still the old one.
show arp vrf xxx
Protocol Address Age (min) Hardware Addr Type Interface
Internet 172.19.3.201 33 xxxx.xxxx.3112 ARPA Vlanxxx
ping vrf xxx 172.19.3.201
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.19.3.201, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
To resolve the problem:
clear arp-cache vrf xxx 172.19.3.201
show arp vrf xxx
Protocol Address Age (min) Hardware Addr Type Interface
Internet 172.19.3.201 2 xxxx.xxxx.194f ARPA Vlanxxx
ping vrf xxx 172.19.3.201
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.19.3.201, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/9 ms
The Port configuration is like this:
switchport access vlan xxx
switchport mode access
switchport port-security
switchport port-security aging time 5
switchport port-security violation restrict
switchport port-security aging type inactivity
storm-control broadcast level 1.00
storm-control action trap
no cdp enable
spanning-tree portfast
spanning-tree bpduguard enable
This is now the third time it happend. I dont want to change the arp timer. IOS version on the Switchs 15.0(2)SE2.
Has Somebody any idea?
Thanks
