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Using advanced features
214 Avaya VPNmanager Configuration Guide Release 3.7
6. After VSU
A
establishes a connection with VSU
C
, the resilient tunnel is used for VPN traffic.
7. On a periodic basis, VSU
A
continues to request a heartbeat from VSU
B
. The period is called
Dead Primary Poll Interval.
8. If VSU
A
reconnects with VSU
B
, VSU
A
waits for a specific time before it switches traffic back
to VSU
B
. The waiting period is called Hold-down Time.
Note:
Note: If packet filtering is used, be sure the heartbeat packets are not filtered. The
security gateway heartbeat listening port = 1643 using UDP protocol.
Creating a resilient tunnel
Resilient tunnels are configured from the Resilient Tunnel tab.
Figure 69: The Resilient Tunnel tab for a security gateway Object
● Enable SNMP Traps. Check this box if you want SNMP traps enabled for the resilient
tunnel.
● Dead Poll Intervals. The number of seconds between heartbeat poll requests to a dead
primary. This is different from the normal Heartbeat Interval because the primary security
gateway is believed to be inactive and no response is expected. Therefore, the interval is
much longer than a normal heartbeat request interval.