Administration of the Avaya G350 Media Gateway - Avaya Support

Configuring the routerAdditional GRE tunnel parametersUse the following commands to configure additional GRE tunnel parameters. For moreinformation about these commands, see Avaya G350 Media Gateway CLI Reference,555-245-202.●●●Use the tunnel checksum command in the context of the GRE tunnel interface to add achecksum to the GRE header of packets traveling through the tunnel. When a checksum isincluded on one endpoint, the receiving tunnel endpoint performs checksum validation onincoming packets and packets without a valid checksum are discarded. Use the no form ofthis command to disable checksums.Use the tunnel key command in the context of the GRE tunnel interface to enable andset an ID key for the tunnel. Tunnel ID keys are used as a security device. The key mustbe set to the same value on the tunnel endpoints. Packets without the configured key mustbe discarded. Use the no form of this command to disable key checking.Use the tunnel DSCP command in the context of the GRE tunnel interface to assign aDSCP value to packets traveling through the tunnel. The DSCP value is placed in thepacket’s Carrier IP header. You can assign a DSCP value between 0 and 63. If you do notassign a DSCP value, the DSCP value is copied from the packet’s original IP header.Note:Note:●●Note:The Carrier IP header identifies the source and destination IP address of thetunnel.Use the tunnel TTL command in the context of the GRE tunnel interface to assign a TTLvalue to packets traveling through the tunnel. The TTL value is placed in the packet’sCarrier IP header. You can assign a TTL value between 1 and 255. The default tunnel TTLvalue is 255.Use the show interface tunnel command to show interface configuration andstatistics for a particular tunnel or all GRE tunnels.Note:If the tunnel interface is down, the show interface tunnel commanddisplays the MTU value as not available.174 Administration of the Avaya G350 Media Gateway