Additional Gre Tunnel Parameters - Avaya G250 Administration

Configuring the router
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
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 15
Done!
G350-001(super-if:Tunnel 2)#
6. Type the copy running-config startup-config command. This saves the new
tunnel interface configuration in the startup configuration file.
For a list of optional GRE tunnel features, refer to
For a list of additional GRE tunnel CLI commands, refer to
parameters on page 328.

Additional GRE tunnel parameters

Use the following commands to configure additional GRE tunnel parameters. For more
information about these commands, see Avaya G250 and Avaya G350 CLI Reference,
03-300437.
Use the tunnel checksum command in the context of the GRE tunnel interface to add a
●
checksum to the GRE header of packets traveling through the tunnel. When a checksum is
included on one endpoint, the receiving tunnel endpoint performs checksum validation on
incoming packets and packets without a valid checksum are discarded. Use the no form of
this command to disable checksums.
Use the tunnel key command in the context of the GRE tunnel interface to enable and
●
set an ID key for the tunnel. Tunnel ID keys are used as a security device. The key must
be set to the same value on the tunnel endpoints. Packets without the configured key must
be 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 a
●
DSCP value to packets traveling through the tunnel. The DSCP value is placed in the
packet's Carrier IP header. You can assign a DSCP value between 0 and 63. If you do not
assign a DSCP value, the DSCP value is copied from the packet's original IP header.
Note:
The Carrier IP header identifies the source and destination IP address of the
Note:
tunnel.
328 Administration for the Avaya G250 and Avaya G350 Media Gateways
Dynamic MTU discovery on page 326.
Optional GRE tunnel features
Additional GRE tunnel
on page 325.