High Availability | Junos OS Evolved

NSR faster detection of connection slowness on replication layer (PTX10004, PTX10008, and PTX10016)—Starting in Junos OS Evolved Release 23.4R1, nonstop active routing (NSR) detects connection slowness on the replication layer faster. Faster detection helps reduce the negative impact that replication layer issues can have on NSR sessions, especially those with low hold timers.

[See Nonstop Active Routing Concepts for Junos OS Evolved.]

NSR switchover support with low hold timers (PTX10004, PTX10008, and PTX10016)—Starting in Junos OS Evolved Release 23.4R1, we support 4k BGP sessions with hold timers as low as 3 seconds on nonstop active routing (NSR) switchovers, depending on the number of BGP sessions. See the following table for timer details for the number of sessions.

BGP Hold-Timer Value (in seconds)	Number of BGP Sessions
3	80
5	120
10	200
15	400
30	600
45	800
90	1800

[See hold-time and precision-timers.]

BFD session damping for LACP interfaces (PTX10001-36MR, PTX10003, PTX10004, PTX10008, and PTX10016)—Starting in Junos OS Evolved Release 23.4R1, you can use BFD session damping on LACP interfaces to suppress BFD session state change notifications for a configured time period when thresholds for session flapping are exceeded. Session damping helps reduce potential instability from excessive BFD notifications.

Use the set bfd-liveness-detection damping configuration statement at the [edit dynamic-profiles name interfaces name aggregated-ether-option] hierarchy level to configure BFD session damping.

[See BFD Session Damping Overview.]