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    Understanding the Effect of Switching to a TX Matrix Plus or T1600 Backup Routing Engine

    We recommend that you run the same Junos OS release on the master and backup Routing Engines. If you choose to run different Junos OS releases on the Routing Engines, a change in Routing Engine mastership can cause one or all T1600 routers to be logically disconnected from the TX Matrix Plus router.

    Table 1: Effect of Switching a TX Matrix Plus or T1600 Routing Engine

    Configuration

    Effect of a Change in Mastership

    The on-loss-of-keepalives statement is included at the [edit chassis redundancy failure] hierarchy level

    You or a host subsystem initiates a change in mastership to the backup Routing Engine in the TX Matrix Plus router—The master Routing Engines in the T1600 routers detect a software release mismatch with the new master Routing Engine in the TX Matrix Plus router and switch mastership to their backup Routing Engines.

    You attempt to initiate a change in mastership to a backup Routing Engine in a T1600 router—The new master Routing Engine in the T1600 router detects a software release mismatch with the master Routing Engine in the TX Matrix Plus router and relinquishes mastership to the original master Routing Engine. Routing Engine mastership in the TX Matrix Plus router does not switch in this case.

    A host subsystem initiates a change in mastership to a backup Routing Engine in a T1600 router because the master Routing Engine has failed—The T1600 router is logically disconnected from the TX Matrix Plus router.

    The on-loss-of-keepalives statement is not included at the [edit chassis redundancy failure] hierarchy level

    You initiate a change in mastership to the backup Routing Engine in the TX Matrix Plus router—All T1600 routers are logically disconnected from the TX Matrix Plus router.

    You initiate a change in mastership to a backup Routing Engine in a T1600 router—The T1600 router is logically disconnected from the TX Matrix Plus router. To reconnect the T1600 router, switch mastership of the new master Routing Engine in the T1600 router back to the original master Routing Engine.

    Published: 2011-12-19