Figure 339: M20 Router Redundant Ssb Location; Display Redundant Ssb Configuration - Juniper M Series Monitoring And Troubleshooting Manual

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M Series and T Series Routers Monitoring and Troubleshooting Guide

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Figure 339: M20 Router Redundant SSB Location

The SSB houses the Internet Processor ASIC and two Distributed Buffer Manager ASICs.

The SSB is hot-pluggable. You can remove and replace it without powering down the

system; however this causes major impact to the system. The following functions cannot

occur while the SSB is removed from the router:

Route lookups

System component monitoring

Exception and control packet monitoring

When you remove the SSB, all packet forwarding stops immediately and the Routing

Engine responds by generating alarms. When you replace the SSB, it is rebooted by flash

If you remove the Routing Engine, the SSB enters a warm shutdown mode and continues

its forwarding process for a limited time using a frozen forwarding table. The time limit

is determined by a timer in the SSB. If you replace the Routing Engine during the warm

shutdown period, the SSB unfreezes its forwarding tables and resumes normal functioning.

Otherwise, the SSB shuts itself down.

Checklist for Monitoring Redundant SSBs on page 715

To display the current SFM redundancy configuration.

You can configure which SSB is the master and which is the backup. By default, the SSB

in slot 0 is the master and the SSB in slot 1 is the backup. You can modify the default

configuration by including the

statement at the

[edit chassis redundancy]