Understanding The Effect Of Switching To A Tx Matrix Plus Or T1600 Backup Routing Engine - Juniper TX MATRIX PLUS Hardware Manual

Table 55: Effect of Taking the Host Subsystem Offline (continued)
Master host subsystem
Related
Documentation
Understanding the Effect of Switching to a TX Matrix Plus or T1600 Backup Routing
Engine
Copyright © 2010, Juniper Networks, Inc.
The backup host subsystem becomes the master. The backup Routing Engine assumes Routing
Engine functions. The master host subsystem is hot-pluggable.
NOTE: The TX Matrix Plus router and any connected T1600 routers support nonstop active
routing in Junos OS Release 10.0 and later.
During the switchover:
Graceful Routing Engine switchover (GRES) and nonstop active routing (NSR) are both
configured—Packet forwarding and routing are continued without interruption.
GRES is configured but NSR is not configured—Packet forwarding continues but routing is
interrupted momentarily.
GRES and NSR are not configured—Packet forwarding halts while the standby Routing Engine
becomes the master. The Packet Forwarding Engine components reset and connect to the
new master Routing Engine.
NOTE: TX Matrix Plus router performance might change if the backup Routing Engine's
configuration differs from the former master's configuration. For the most predictable performance,
configure the two Routing Engines identically, except for parameters unique to each Routing
Engine.
For information about configuring graceful switchover and nonstop active routing, see the Junos
OS High Availability Configuration Guide.
TX Matrix Plus Host Subsystem Description on page 20
Troubleshooting the TX Matrix Plus Host Subsystem on page 311
TX Matrix Plus Preventing Electrostatic Discharge Damage on page 392
We recommend that you run the same Junos OS Release on the master and backup
Routing Engines. If you choose to run different Junos OS Releases on the Routing Engines,
a change in Routing Engine mastership can cause one or all T1600 routers to be logically
disconnected from the TX Matrix Plus router.
Chapter 22: Replacing TX Matrix Plus Hardware Components
325