Setting Up A Gre Tunnel - Avaya G250 Administration

Setting up a GRE tunnel

To set up a GRE tunnel:
1. Use the interface tunnel command, followed by a number identifying the tunnel, to
create the new tunnel interface. If you are changing the parameters of an existing tunnel,
use the interface tunnel command, followed by a number identifying the tunnel, to
enter the context of the tunnel. For example:
G350-001(super)# interface tunnel 2
G350-001(super-if:Tunnel 2)#
2. In the interface context, use the tunnel source command, followed by the public IP
address of the local tunnel endpoint, to set the source address of the tunnel. For example:
G350-001(super-if:Tunnel 2)# tunnel source 70.70.70.2
Done!
G350-001(super-if:Tunnel 2)#
3. In the interface context, use the tunnel destination command, followed by the IP
address of the remote tunnel endpoint, to set the destination address of the tunnel. For
example:
G350-001(super-if:Tunnel 2)# tunnel destination 20.0.1.1
Done!
G350-001(super-if:Tunnel 2)#
Note:
The Avaya G250/G350 Media Gateway does not check whether the configured
Note:
tunnel source IP address is an existing IP address registered with the G250/
G350 router.
4. In most cases, it is recommended to configure keepalive in the tunnel so that the tunnel's
source interface can determine and inform the host if the tunnel is down. For more
information on keepalive, see
To configure keepalive for a tunnel interface, type the keepalive command in the interface
context, followed by the length (in seconds) of the interval at which the source interface
sends keepalive packets, and the number of retries necessary in order to declare the tunnel
down. 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.
G350-001(super-if:Tunnel 2)# keepalive 20 3
Done!
G350-001(super-if:Tunnel 2)#
keepalive on page 325.
Configuring GRE tunneling
Issue 1.1 June 2005 327