Tunnel Path-Mtu-Discovery - Avaya G450 Cli Reference Manual

CLI Commands

tunnel path-mtu-discovery

Use the tunnel path-mtu-discovery command to specify that the tunnel maintain
information on the maximum allowable packet size (smallest MTU) for the entire routing path of
the tunnel. Packets entering the tunnel that are larger than the tunnel's MTU are either
fragmented, or sent back with a request for fragmentation (depending on the DF bit of the
packet).
Use the age-timer parameter to force the tunnel to update the MTU after a specified number of
minutes. Specify infinite to make the MTU value permanent (no updating).
Use the no form of the command to disable MTU discovery.
Note:
When MTU discovery is disabled, the tunnel's source interface marks all packets
Note:
may be fragmented, even if the packet's original setting is do not fragment. It is
highly recommended to enable the MTU-discovery feature on a tunnel.
Syntax
tunnel path-mtu-discovery [age-timer {minutes
no tunnel path-mtu-discovery
Parameters
Parameter
age-timer
minutes
infinite
User Level
read-write
Context
Interface: Tunnel (L2, L2-L3)
448 Avaya G450 CLI Reference
Description
Keyword for specifying how often the tunnel
must update the MTU
Number of minutes after which the tunnel is
updated
The tunnel does not update the MTU and its
value remains permanent
GRE tunneling
| ]
infinite}
Possible Default
Values Value
10-30 10