Juniper MX240 routing-engine failover configuration and tips

Juniper router MX240 routing-engine failover configuration and tips

 

GRES (Graceful Routing Engine Switchover) is easier to setup.

 

[edit chassis redundancy]
Juniper@MX2400# show

routing-engine 0 master;
routing-engine 1 backup;
graceful-switchover {
    apply-groups [ re0 re1 ];
}

 

Configuration

{master}
Juniper@MX2400> show configuration | find redundancy
    redundancy {
        routing-engine 0 master;
        routing-engine 1 backup;
        graceful-switchover {
            apply-groups [ re0 re1 ];
        }
    }
    routing-engine {
        on-disk-failure disk-failure-action reboot;
    }
    fpc 1 {
        pic 0 {
            max-queues-per-interface 8;
        }
        pic 1 {
            max-queues-per-interface 8;
        }
    }
}

 

{backup}
Juniper@MX2400> show configuration | find redundancy
    redundancy {
        routing-engine 0 master;
        routing-engine 1 backup;
        graceful-switchover {
            apply-groups [ re0 re1 ];
        }
    }
    routing-engine {
        on-disk-failure disk-failure-action reboot;
    }
    fpc 1 {
        pic 0 {
            max-queues-per-interface 8;
        }
        pic 1 {
            max-queues-per-interface 8;
        }
    }
}

 

1. To switch manual switch from master to backup; RE0(Master-slot0) / RE1(Backup-slot1)

From console on RE0(master)

Juniper@MX2400> request chassis routing-engine master switch

 

2. Force to synchronize between RE0 and RE1

 

Juniper@MX240# commit synchronize

 

 

3. Status of routing-engine redundancy

Juniper@MX240> show chassis routing-engine

Routing Engine status:
Slot 0:
Current state Master
Election priority Master (default)
Temperature 39 degrees C / 81 degrees F
DRAM 2048 MB
Memory utilization 15 percent
CPU utilization:
User 0 percent
Background 0 percent
Kernel 2 percent
Interrupt 0 percent
Idle 98 percent
Model RE-3.0
Serial ID P10865723239
Start time 2012-04-15 18:45:12 UTC
Uptime 6 days, 3 hours, 56 minutes, 8 seconds
Routing Engine status:
Slot 1:
Current state Backup
Election priority Backup (default)
Temperature 27 degrees C / 78 degrees F
DRAM 2048 MB
Memory utilization 10 percent
CPU utilization:
[…Omitted…]

 

 

4. Successive Routing Engine switchover events must be a minimum of 240 seconds (4 minutes) apart after both Routing Engines have come up. So, once backup routing-engine is becoming master, let him give 4 minutes before move back to RE0 as master.

 

5. To verify whether graceful Routing Engine switchover is enabled, on the backup Routing Engine, issue the show system switchover command

Juniper@MX2400> show system switchover

Graceful switchover: On
Configuration database: Ready
Kernel database: Ready
Peer state: Steady state