Administration of the Avaya G350 Media Gateway - Avaya Support

Configuring GRE tunneling3. In the interface context, use the tunnel destination command, followed by the IPaddress of the remote tunnel endpoint, to set the destination address of the tunnel. Forexample:G350-001(super-if:Tunnel 2)# tunnel destination 20.0.1.1Done!G350-001(super-if:Tunnel 2)#Note:Note:The Avaya G350 Media Gateway does not check whether the configured tunnelsource IP address is an existing IP address registered with the G350 router.4. In most cases, it is recommended to configure keepalive in the tunnel so that the tunnel’ssource interface can determine and inform the host if the tunnel is down. For moreinformation on keepalive, see keepalive on page 171.To configure keepalive for a tunnel interface, type the keepalive command in the interfacecontext, followed by the length (in seconds) of the interval at which the source interfacesends keepalive packets, and the number of retries necessary in order to declare the tunneldown. The following example configures the tunnel to send a keepalive packet every 20seconds, and to declare the tunnel down if the source interface sends three consecutivekeepalive packets without a response.G350-001(super-if:Tunnel 2)# keepalive 20 3Done!G350-001(super-if:Tunnel 2)#5. In most cases, it is recommended to configure dynamic MTU discovery in the tunnel. Thisprevents fragmentation of packets larger than the tunnel’s MTU. When dynamic MTUdiscovery is not enabled, the tunnel fragments packets larger than the tunnel’s MTU, evenwhen the packet is marked do not fragment. For more information on dynamic MTUdiscovery, see Dynamic MTU discovery on page 172.The following example configures dynamic MTU discovery, with an age timer of 15 minutes.G350-001(super-if:Tunnel 2)# tunnel path-mtu-discovery age-timer 15Done!G350-001(super-if:Tunnel 2)#6. Type the copy running-config startup-config command. This saves the newtunnel interface configuration in the startup configuration file.For a list of optional GRE tunnel features, refer to Optional GRE tunnel features on page 171.For a list of additional GRE tunnel CLI commands, refer to Additional GRE tunnelparameters on page 174.Issue 3 January 2005 173