Juniper EX9200 Features Manual page 41

Overview
Configuration
CLI Quick
Configuration
[edit protocols]
[edit logical-systems
logical-system-name}
[edit logical-systems
logical-system-name
routing-instances
routing-instance-name]
[edit routing-instances
routing-instance-name]
Step-by-Step
Procedure
Copyright © 2017, Juniper Networks, Inc.
Before you follow the directions here to configure graceful restart, be sure you have
enabled GRES, which is disabled by default. See
Switchover" on page 17 for more information.
If adjacencies between the Routing Engine and the neighboring peer 'helper' routers time
out, graceful restart protocol extensions are unable to notify the peer 'helper' routers
about the impending restart. Graceful restart can then stop and cause interruptions in
traffic.
To ensure that these adjacencies are kept, change the hold-time for IS-IS protocols from
the default of 27 seconds to a value higher than 40 seconds.
If your system uses the open shortest pathway first (OSPF) protocol instead of IS-IS,
see Example: Configuring OSPF Timers for configuration information.
Configuring the IS-IS Protocol Hold Time for Graceful Restart on page 21
Results on page 22
To quickly configure the hold-time, copy the following commands, paste them into a
text file, remove any line breaks, change any details necessary to match your network
configuration, and then copy and paste the commands into the CLI at the different
hierarchy levels shown.
Each interface must be set individually, with a value for each level that the routing device
operates on. The minimum recommended value of 41 seconds is used in this example,
your system may require a higher value based on size and traffic.
Level 1 and level 2 can be set to different values.
set protocols isis interface ge-1/2/0 level 1 hold-time 41
set protocols isis interface ge-1/2/0 level 2 hold-time 41
set protocols isis interface ge-1/2/0 level 1 hold-time 41
set protocols isis interface ge-1/2/0 level 2 hold-time 41
set protocols isis interface ge-1/2/0 level 1 hold-time 41
set protocols isis interface ge-1/2/0 level 2 hold-time 41
set protocols isis interface ge-1/2/0 level 1 hold-time 41
set protocols isis interface ge-1/2/0 level 2 hold-time 41
Configuring the IS-IS Protocol Hold Time for Graceful Restart
To configure the IS-IS hold-time for graceful restart:
Locate or set the interfaces.
1.
set protocols isis interface interface-name
Chapter 3: Configuring GRES
"Configuring Graceful Routing Engine
21