Juniper ACX2000

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Ensure that nonstop active routing (NSR) and nonstop bridging (NSB) are enabled. If
enabled, disable graceful restart (GR), because NSR and GR cannot be enabled
simultaneously. NSB and GR enable NSB-supported Layer 2 protocols to synchronize
protocol information between the master and backup Routing Engines.
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If NSR is not enabled (Stateful Replication is Disabled), then enable NSR. NSR requires
you to configure graceful Routing Engine switchover (GRES). By default, NSR is disabled.
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To enable graceful Routing Engine switchover, include the graceful-switchover
statement at the [edit chassis redundancy] hierarchy level as user@host#set chassis
redundancy graceful-switchover.
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To enable NSR, include the nonstop-routing statement at the [edit routing-options]
hierarchy level as user@host#set routing-options nonstop-routing.
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Enable nonstop bridging (NSB). Nonstop bridging requires you to configure graceful
Routing Engine switchover (GRES). By default, NSB is disabled.
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To enable graceful Routing Engine switchover, include the graceful-switchover
statement at the [edit chassis redundancy] hierarchy level as user@host#set chassis
redundancy graceful-switchover.
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To enable NSB, include the nonstop-bridging statement at the [edit protocols
layer2-control] hierarchy level as user@host#set protocols layer2-control
nonstop-bridging.
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(Optional) Back up the system software—Junos OS, the active configuration, and log
files—on the router to an external storage device with the request system snapshot
command.
On ACX5000 line of routers, you need to consider the following feature before performing
ISSU:
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ISSU supports link fault management (LFM) timeout sessions of 1 second interval.
During ISSU, you may notice LFM flaps for sessions having timeout interval of less than
1 second.
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Bidirectional Forwarding Detection (BFD) sessions having timeout interval of less than
1 second need to be reconfigured to 1 second before starting the ISSU process. You
can restore the timeout interval to its original value after completing the ISSU process.
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ISSU supports interval slow (every 30 seconds) for periodic transmission of Link
Aggregation Control Protocol (LACP) packets.
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ISSU supports Virtual Router Redundancy Protocol (VRRP) version 3.
ISSU do not support the following ACX5000 features:.
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Downgrade to an earlier version of Junos OS software. If you want to install an earlier
version of Junos OS software, use the request system software add CLI command.
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Upgrade of Host OS software.
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Connectivity fault management (CFM).
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TWAMP, RPF, RFC2544, and clocksyncd daemon (timing functionality).
Copyright © 2017, Juniper Networks, Inc.70
ACX Series Universal Access Router Configuration Guide