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Limiting PMTU
You can limit calculated PMTU values within a range by using the tcp
path-mtu-discovery max-mtu and tcp path-mtu-discovery min-mtu commands.
When specifying PMTU limits, keep the following in mind:
tcp path-mtu-discovery max-mtu
tcp path-mtu-discovery min-mtu
host1:VR1(config)#tcp path-mtu-discovery
Example 2 Sets path MTU discovery age timers differently
host1:VR1(config)#tcp path-mtu-discovery age-timer 20 15
Example 3 Sets path MTU discovery age timers to the same value
(5 minutes)
host1:VR1(config)#tcp path-mtu-discovery age-timer 5
Example 4 Disables path MTU discovery age timers
host1:VR1(config)#tcp path-mtu-discovery age-timer infinite
Use the no version with a keyword to return the value to its default. Issue the
no version without any keywords to disable path MTU discovery on the virtual
router.
See tcp path-mtu-discovery
If a PMTU discovery value is lower than the configured minimum MTU setting,
PMTU discovery is disabled for that connection.
If a PMTU discovery value is larger than the configured maximum MTU setting,
the configured maximum MTU setting is used.
The maximum MTU setting must be greater than the minimum MTU setting.
Use to limit the maximum MTU size used for the path MTU.
Example
host1:VR1(config)#tcp path-mtu-discovery max-mtu 512
Use the no version to remove any limitation so that the virtual router uses the
path MTU discovery value.
See tcp path-mtu-discovery
Use to specify the minimum MTU value used for the path MTU. If the discovered
PMTU value is less than the minimum setting, path MTU discovery is disabled
for this connection.
Example
host1:VR1(config)#tcp path-mtu-discovery min-mtu 255
Chapter 1: Configuring IP
43
IP Routing
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