High Availability Support for the Services SDK

You can pair two Multiservices PICs in high availability mode using the virtual rms interface.

As part of the configuration, one of the PICs is set as the primary and the other as the secondary PIC. When the rms interface comes up, the primary PIC comes up as active and the secondary PIC as standby. On failure of the active PIC, the standby PIC will become active and traffic will be switched over to the new active PIC.

When the failed primary PIC is restored, it comes up as standby. The network administrator must explicitly request a reversion to the primary PIC to make it active again. Otherwise, it continues in standby mode until the active PIC fails.

To create the rms interface, include the redundancy-options statement at the [edit interfaces interface-name] hierarchy level.

[edit interfaces interface-name]
redundancy-options {
    primary ms-fpc/pic/port; secondary ms-fpc/pic/port;
unit logical-unit-number family inet ipaddr;

The interface-name variable is rmsnumber, where number is in the range from 0 to 127.

Note: To bring up the rms interface, you must include the unit logical-unit-number family inet statement.

When a new rms interface is created, the PICs designated as primary and secondary will reboot automatically. If either the primary or secondary PIC, or both, are changed, the corresponding old and new ms- interfaces will reboot automatically.

Note: The rms interface is also supported for service sets, class of service, routes.

For more information on the redundancy-options statement, see the JUNOS Services Interfaces Configuration Guide.

The following commands support Multiservices PIC redundancy:

clear interfaces statistics—Clear interface statistics. When the show interfaces statistics command is next issued, the output will show the packets received since the last time the clear interfaces statistics command was issued. However, after a graceful Routing Engine switchover (GRES), issuing the show interfaces statistics command will show cumulative statistics.

request interface (revert |switchover)—Manually change over to the other PIC. Use revert to revert to the primary interface; use switchover to change, or switch over, to the secondary interface. After the switchover, it is recommended to place the old active PIC offline temporarily so it comes up fresh as a new backup.

show interfaces redundancy—Display general information about the rms and ms- interfaces redundancy. You can use this command to determine which PIC is currently active.

show interfaces statistics—Display interface statistics, such as packets received, packets transmitted, and errors. Available in three different levels of detail.

For detail on these commands as used in support of the rms interface, including sample output, see the Operational Command Reference. For information on these commands in other contexts, see the JUNOS Interfaces Command Reference.

Other Configuration Guidelines:
Guidelines for Configuring SDK Applications

See also:
Statement Summary

Configuration Command Summary

Operational Command Reference

SDK CLI Configuration

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