124| Network Configuration Parameters AOS-W 6.5.3.x| User Guide
Figure 27 ConfiguringHeartbeats (Keepalives)
3. To enable tunnel keepalives and display the Heartbeat Interval and Heartbeat Retries fields, click Enable
Heartbeats.
a. Specify a value for Heartbeat Interval.
The default value is 10 seconds.
b. Specify a value for Heartbeat Retries.
The default value is 3 retries.
4. Click Apply.
In the CLI
To configure the keepalive heartbeats, use the following commands:
(host)(config) #interface tunnel id
tunnel keepalive [<interval> <retries>] [cisco]
Configuring GRE Tunnel Groups
This section contains the following information:
n About GRE Tunnel Groups
n Enabling a Tunnel Group
n Points to Remember
n Configuring a Layer-2 or Layer-3 Tunnel Group Using the CLI
n Configuring a Layer-2 or Layer-3 Tunnel Group Using the WebUI
About GRE Tunnel Groups
The switch supports redundancy of Generic Routing Encapsulation (GRE) tunnels for both Layer-2 and Layer-3
GRE tunnels. This feature enables automatic redirection of the user traffic to a standby tunnel when the
primary tunnel goes down.
A tunnel group is identified by a name or number. You can add multiple tunnels to a tunnel group.
Tunnel Group Order
The order of the tunnels defined in the tunnel-group configuration specifies their standby precedence. The first
member of the tunnel-group is the primary tunnel.
Tunnel Failover
A GRE tunnel group combines two tunnels created in the switch, where one tunnel is active and the other
tunnel is the standby. Traffic forwarding can occur on the active tunnel, and the standby tunnel can become
active once the active tunnel is down.
When the first tunnel fails, the second tunnel carries the traffic. The third tunnel in the tunnel-group takes over
if the second tunnel also fails.
In the meantime, if the first tunnel comes up, it becomes the most eligible standby tunnel.
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