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S9312 refreshes arp entry abnormally

Publication Date:  2012-11-20 Views:  42 Downloads:  0
Issue Description
Two 9312 topology with 2 firewall for square,open vrrp. the connecting business will be interrupted when firewall switching, the interruption time is equal to arp entry aging time.

Alarm Information
NULL
Handling Process
1、Mirroring packet capturing, check firewall sending free arp packet correct, and confirm that 9312 received the free arp packet.
2、9312 received the free arp packet and refresh its mac entry, but firewall connecting business interrupted, check arp entry on 9312,muti IP address corresponding to the same mac address arp table, interruption business refreshed successful.like follows:

dis arp all
IP ADDRESS MAC ADDRESS EXPIRE(M) TYPE INTERFACE VPN-INSTANCE
VLAN/CEVLAN
------------------------------------------------------------------------------

118.85.207.188 0022-553e-eb3e 1 D-0 GE7/0/0 163
100/-
118.85.207.193 0022-553e-eb3e 2 D-0 Eth-Trunk1 163
100/-
118.85.207.194 0022-553e-eb3e 2 D-0 Eth-Trunk1 163
100/-
118.85.207.191 0022-553e-eb3e 5 D-0 GE7/0/0 163
100/-
118.85.207.192 0022-553e-eb3e 2 D-0 Eth-Trunk1 163

3、firewall takes nat address switch,it has muti public network address,but the same mac address send free arp to 93 when switch,9312 cannot suffice that the same mac corresponding to muti IP.
4、9312 V1R6C00SPC800 version optimized refreshing arp basic mac address  function,it supports muti IP corresponding to one mac scene. configuration way:[Quidway]mac-address update arp.



Root Cause
1、Firewall sending free arp packet abnormal.
2、9312 switch refresh arp mechanism abnormal.
Suggestions
NULL

END