Avaya G430 - Page 441

The following example configures the tunnel to send a keepalive packet every 20
seconds, and to declare the tunnel down if the source interface sends three
consecutive keepalive packets without a response.
Gxxx-001(super-if:Tunnel 2)# keepalive 20 3
Done!
Gxxx-001(super-if:Tunnel 2)#
5. In most cases, it is recommended to configure dynamic MTU discovery in the
tunnel.
This prevents fragmentation of packets larger than the tunnel’s MTU. When
dynamic MTU discovery is not enabled, the tunnel fragments packets larger than
the tunnel’s MTU, even when the packet is marked do not fragment. For more
information on dynamic MTU discovery, see
Dynamic MTU discovery on
page 439.
The following example configures dynamic MTU discovery, with an age timer of 15
minutes.
Gxxx-001(super-if:Tunnel 2)# tunnel path-mtu-discovery age-timer 15
Done!
Gxxx-001(super-if:Tunnel 2)#
6. Enter copy running-config startup-config.
This saves the new Tunnel interface configuration in the startup configuration file.
Result
For a list of optional GRE tunnel features, refer to Optional GRE tunnel features on
page 438. For a list of additional GRE tunnel CLI commands, refer to
Summary of GRE
tunneling commands on page 443.
GRE tunnel application example
This section provides an example of a GRE tunnel application and its configuration.
The router
Administering Avaya G430 Branch Gateway October 2013 441