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Configuring GRE Tunneling
Issue 5 October 2007 231
Remote IP The IP address of the remote endpoint of the tunnel.
Note:
Note: The local IP and remote IP must be different.
DSCP The offset to the DSCP value in the encapsulation header, which is
used to show the difference between encapsulated traffic and regular
traffic on a physical interface. Possible values are:
● No Change
● An integer between 0 - 63
Interface MTU The current Maximum Transmission Unit for the physical interface
through which tunnel packets are sent.
Note:
Note: This field is read-only.
Path MTU
Discovery
When checked, the device actively polls the next hop device for MTU
value.
Tunnel MTU The Maximum Transmission Unit for the tunnel.
Note:
Note: This field is read-only.
Note:
Note: This field is only active when Path MTU Discovery is
active.
Hop Limit Maximum number of intervening devices between two endpoints of an
IP tunnel.
Verify Checksum When checked, the Avaya G250/G350/G450 verifies the checksum
value in IP headers of packets traveling over the tunnel.
Key Mode When checked, a shared key is used for envcrypting traffic over an IP
tunnel.
Key The shared key for encrypting traffic over an IP tunnel.
Aging Timer The number of minutes Path MTU Discovery is aged. Default: 10. A
value of 0 indicates Aging Timer is disabled.
Note:
Note: Aging Timer can only be changed if Path MTU
Discovery is set.
Table 76: GRE Tunnel Parameters (continued)
Field Description
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