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backup-liveness-detection

 

Syntax

Hierarchy Level

Release Information

Statement introduced in Junos OS Release 12.2 for the QFX Series.

Statement introduced in Junos OS Release 13.2R1 for EX Series switches.

Statement introduced in Junos OS Release 15.2R1 for MX Series routers.

Description

Determine whether a peer is up or down by exchanging keepalive messages over the management link between the two Inter-Chassis Control Protocol (ICCP) peers.

When an ICCP connection is operationally down, the status of the peers hosting a multichassis link aggregation group (MC-LAG) is detected by sending liveness detection requests to each other. Peers must respond to liveness detection requests within a specified amount of time. If the responses are not received within that time for a given number of consecutive attempts, the liveness detection check fails, and a failure action is implemented. Backup liveness detection must be configured on both peers hosting the MC-LAG.

The remaining statement is explained separately. See CLI Explorer.

Note

If backup liveness detection is configured, the peer status is always up when either the ICCP TCP Connection is established, or Bidirectional Forwarding Protocol (BFD) is configured and the peer is up. The backup liveness check is only performed when the ICCP connection is down.

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.