When the two-node hot backup server handover, it can’t be accessed to without after 20 minutes.

Publication Date:  2012-11-06 Views:  196 Downloads:  0
Issue Description
User network structure
USG ---second layer exchange---two-node cluster server
2 sets of Linux server are used as two-node cluster, when occurred master/slave handover, it can’t be accessed to without after 20 minutes.
Alarm Information
None.
Handling Process
1, Suggest user to change the arp entry’s aging time of USG, the changing orders are as follows:
Executive command interface “interface interface-type interface-number”, enter interface view.
Executive order “arp detect-times detect-times, set up the aging detection frequency of the dynamic arp entry.
By default, the aging detection frequency of the dynamic arp entry is 3.
Executive order “arp expire-time expire-time, set up the aging timeout time of the dynamic arp entry.
By default, the aging timeout time of the dynamic arp entry is 1200 seconds.
2, After the user changed the aging time of arp entry to 1 minute, server happens handover again, it will can connect successfully in a minute when access again.
Root Cause
1, when the server happens master/slave handover, it hasn’t sent free arp, update the USG arp table, the aging time of our equipment’s arp table is 20 minutes
Suggestions
None.

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