Juniper IGP - CONFIGURATION GUIDE V11.1.X, Configuration Manual

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Use the no version to remove any limitation so that the virtual router uses the
discovered path MTU value.
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See tcp path-mtu-discovery
Specifying Black Hole Thresholds
A black hole threshold is a limit to the number of times a virtual router can retransmit
identical sequences of datagrams before the retransmissions are identified as a
problem.
Some domains might be configured not to generate certain ICMP messages (like an
ICMP destination unreachable message) or to filter all ICMP messages. Under these
conditions, the source of oversized ICMP packets never learns that it is sending
oversized packets. The device continues sending oversized packets that never get
through. This behavior is often referred to as a
black hole .
tcp path-mtu-discovery black-hole-detect-threshold
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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.
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Example
host1:VR1(config)# tcp path-mtu-discovery black-hole-detect-threshold 200
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Use the no version to disable black hole threshold detection.
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See tcp path-mtu-discovery
Shutting Down an IP Interface
You can disable an interface to the router at the IP level without removing it.
ip shutdown
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Use to shut down an IP interface.
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Example
host1(config-if)# ip shutdown
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Use the no version to restart the interface.
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See ip shutdown
Removing the IP Configuration
You can remove the IP configuration from an interface or subinterface.
no ip interface
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IP Routing
JUNOSe 11.0.x IP, IPv6, and IGP Configuration Guide