High Availability

Unified ISSU with enhanced mode for JNP10K-LC4802 line card (MX10004 and MX10008)—The in-service-upgrade enhanced-mode CLI option ensures continuous traffic flow during software updates. Use the command request system software in-service-upgrade enhanced-mode to enable unified ISSU with enhanced mode and upgrade without disrupting traffic.

[See How to Use Unified ISSU with Enhanced Mode.]

Support for VRRP tracking with BFD sessions (MX204, MX240, MX304, MX480, MX960, MX2008, MX2010, MX2020, MX10003, MX10004, MX10008, and MX10016)—You can track the state of BFD sessions and dynamically adjust the VRRP priority based on the session status. For example, if a BFD session goes down, the VRRP priority is decreased, triggering an immediate switchover to the backup router. Use the vrrp-group track configuration option to configure VRRP tracking with BFD sessions. Use the show vrrp track bfd command to monitor the state and details of tracked BFD sessions.

[See show vrrp track.]

Commit check for Routing Engine switchover (MX204, MX240, MX301, MX304, MX480, MX960, MX2008, MX2010, MX2020, MX10003, MX10004, MX10008, and MX10016)—If a commit is in progress, Junos OS prohibits Routing Engine switchover until the commit completes. You can ensure that active commit operations do not interfere with a Routing Engine switchover by using the request chassis routing-engine master switch check command. This feature prevents system crashes and undefined states by blocking the switchover until the commit process is complete.

[See request chassis routing-engine master.]