Limiting Pmtu - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - IP-IPV6-IGP CONFIGURATION GUIDE 2010-10-31 Configuration Manual

JunosE 11.3.x IP, IPv6, and IGP Configuration Guide
tcp path-mtu-discovery max-mtu
tcp path-mtu-discovery min-mtu
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increasing the PMTU successfully (minutes2). The range of these two timers is 1–30
minutes. The timer defaults to 10 minutes.
Issue the age-timer indefinite keyword to disable PMTU aging functions.
Example 1—Enables path MTU discovery
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 indefinite
Use the no version with a keyword to return the values to their defaults.
Issue the no version without any keywords to disable path MTU discovery on the virtual
router.
See tcp path-mtu-discovery

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:
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
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