CLI Commands
GRE tunneling
448 Avaya G450 CLI Reference
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:
Note:
When MTU discovery is disabled, the tunnel’s source interface marks all packets
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
|
infinite
}
]
no tunnel path-mtu-discovery
Parameters
User Level
read-write
Context
Interface: Tunnel (L2, L2-L3)
Parameter
Description
Possible
Values
Default
Value
age-timer
Keyword for specifying how often the tunnel
must update the MTU
minutes
Number of minutes after which the tunnel is
updated
10-30
10
infinite
The tunnel does not update the MTU and its
value remains permanent
Summary of Contents for G450 Manager
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