Additional Gre Tunnel Parameters - Avaya G250 Administration

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
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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
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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
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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.
Use the tunnel TTL command in the context of the GRE tunnel interface to assign a TTL
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value to packets traveling through the tunnel. The TTL value is placed in the packet's
Carrier IP header. You can assign a TTL value between 1 and 255. The default tunnel TTL
value is 255.
Use the show interface tunnel command to show interface configuration and
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statistics for a particular tunnel or all GRE tunnels.
Note:
If the tunnel interface is down, the show interface tunnel command
Note:
displays the MTU value as not available.
Configuring GRE tunneling
Issue 3 February 2007 419