request chassis ssb master switch

Syntax

Release Information

Command introduced before JUNOS Release 7.4.

Description

(M20 router only) Control which System and Switch Board (SSB) is master.

Options

no-confirm — (Optional) Do not request confirmation for the switch.

Additional Information

By default, the SSB in slot 0 (SSB0) is the master and the SSB in slot 1 (SSB1) is the backup. If you use this command to change the master, and then restart the chassis software for any reason, the master reverts to the default setting. To change the default master SSB, include the ssb statement at the [edit chassis redundancy] hierarchy level in the configuration. For more information, see the JUNOS System Basics Configuration Guide.

The configurations on the two SSBs do not have to be the same, and they are not automatically synchronized. If you configure both SSBs as masters, when the chassis software restarts for any reason, the SSB in slot 0 becomes the master and the one in slot 1 becomes the backup.

The switchover from the primary SSB to the backup SSB is immediate. The SSB takes several seconds to reinitialize the Flexible PIC Concentrators (FPCs) and restart the PICs. The Interior Gateway Protocol (IGP) and BGP convergence times depend on the specific network environment.

Required Privilege Level

maintenance

Related Topics

show chassis ssb

List of Sample Output

Output Fields

When you enter this command, you are provided feedback on the status of your request.

Sample Output

warning: Traffic will be interrupted while the PFE is re-initialized
Toggle mastership between system switch boards ? [yes,no] (no) yes 

Switch initiated, use “show chassis ssb” to verify

Switch initiated, use “show chassis ssb” to verify