Configuring Gres; Configuring Graceful Routing Engine Switchover; Enabling Graceful Routing Engine Switchover; Configuring Graceful Routing Engine Switchover With Graceful Restart - Juniper EX9200 Features Manual

CHAPTER 3

Configuring GRES

Configuring Graceful Routing Engine Switchover

Enabling Graceful Routing Engine Switchover

Configuring Graceful Routing Engine Switchover with Graceful Restart

Copyright © 2017, Juniper Networks, Inc.
Configuring Graceful Routing Engine Switchover on page 17
Resetting Local Statistics on page 20
Example: Configuring IS-IS for GRES with Graceful Restart on page 20
This section contains the following topics:
Enabling Graceful Routing Engine Switchover on page 17
Configuring Graceful Routing Engine Switchover with Graceful Restart on page 17
Synchronizing the Routing Engine Configuration on page 18
Verifying Graceful Routing Engine Switchover Operation on page 19
By default, graceful Routing Engine switchover (GRES) is disabled. To configure GRES,
include the
graceful-switchover
level.
[edit chassis redundancy]
graceful-switchover;
When you enable GRES, the command-line interface (CLI) indicates which Routing Engine
you are using. For example:
{master} [edit]
user@host#
To disable GRES, delete the
redundancy] hierarchy level.
When using GRES with Graceful Restart, 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.
statement at the
[edit chassis redundancy]
statement from the
graceful-switchover
hierarchy
[edit chassis
17