Description

This article explains the behavior of OSPF dead timers on the EX8216 backup, when Graceful Routing Engine Switchover (GRES) and nonstop routing are enabled.

Symptoms

OSPF has been configured on two of the interfaces of EX8216. Nonstop routing and graceful switchover have also been configured on the switch. When a Primary switchover is performed and the backup occurs, the OSPF dead timer displays 0 .

Solution

This is the default behavior of EX8200 switches; even when nonstop routing is enabled. After landing in the Backup, you should logon to the primary again; as all of the daemons run on the primary and not the Backup. 

{BACKUP.EN_US}[edit system]
root@BK # run show ospf neighbor detail

Address Interface State ID Pri Dead
10.0.0.1 ge-2/0/0.0 Full 10.0.0.1 128 0
Area 0.0.0.0, opt 0x42, DR 0.0.0.0, BDR 0.0.0.0
Up 00:23:18, adjacent 00:23:14
20.0.0.1 ge-2/0/2.0 Full 10.0.0.1 128 0
Area 0.0.0.0, opt 0x42, DR 0.0.0.0, BDR 0.0.0.0
Up 00:22:29, adjacent 00:22:29

{BACKUP.EN_US}
root@BK # run show ospf neighbor

Address Interface State ID Pri Dead
10.0.0.1 ge-2/0/0.0 Full 10.0.0.1 128 0
20.0.0.1 ge-2/0/2.0 Full 10.0.0.1 128 0


{BACKUP.EN_US}[edit chassis]
root@BK # show
redundancy {
    graceful-switchover;
}


{BACKUP.EN_US}[edit]
root@BK # show routing-options
nonstop-routing;
}


{BACKUP.EN_US}[edit]
root@BK # run request chassis routing-engine master switch
Toggle mastership between routing engines ? [yes,no] (no) yes

Resolving mastership...
Complete. The local routing engine becomes the master.


{MASTER}[edit] 
root@BK # run show ospf ne neighbor

Address Interface State ID Pri Dead
10.0.0.1 ge-2/0/0.0 Full 10.0.0.1 128 38
20.0.0.1 ge-2/0/2.0 Full 10.0.0.1 128 37


{MASTER}[edit]
root@BK # run show ospf neighbor 

Address Interface State ID Pri Dead
10.0.0.1 ge-2/0/0.0 Full 10.0.0.1 128 39
20.0.0.1 ge-2/0/2.0 Full 10.0.0.1 128 37


{MASTER}[edit]
root@BK # run show ospf neighbor

Address Interface State ID Pri Dead
10.0.0.1 ge-2/0/0.0 Full 10.0.0.1 128 36
20.0.0.1 ge-2/0/2.0 Full 10.0.0.1 128 34

{MASTER}[edit]
root@BK # run show version invoke-on all-routing-engines
re0:
Hostname: BK
Model: ex8216
JUNOS Base OS boot [10.4R2.6]
JUNOS Base OS Software Suite [10.4R2.6]
JUNOS Kernel Software Suite [10.4R2.6]
JUNOS Crypto Software Suite [10.4R2.6]
JUNOS Online Documentation [10.4R2.6]
JUNOS Enterprise Software Suite [10.4R2.6]
LC JUNOS Installation Software [10.4R2.6]
JUNOS Routing Software Suite [10.4R2.6]
JUNOS Web Management [10.4R2.6]

re1:
Hostname: BK
Model: ex8216
JUNOS Base OS boot [10.4R2.6]
JUNOS Base OS Software Suite [10.4R2.6]
JUNOS Kernel Software Suite [10.4R2.6]
JUNOS Crypto Software Suite [10.4R2.6]
JUNOS Online Documentation [10.4R2.6

JUNOS Enterprise Software Suite [10.4R2.6]
LC JUNOS Installation Software [10.4R2.6]
JUNOS Routing Software Suite [10.4R2.6]
JUNOS Web Management [10.4R2.6]


{MASTER}[edit]
root@BK # run show version

Hostname: BK
Model: ex8216
JUNOS Base OS boot [10.4R2.6]
JUNOS Base OS Software Suite [10.4R2.6]
JUNOS Kernel Software Suite [10.4R2.6]
JUNOS Crypto Software Suite [10.4R2.6]
JUNOS Online Documentation [10.4R2.6]
JUNOS Enterprise Software Suite [10.4R2.6]
LC JUNOS Installation Software [10.4R2.6]
JUNOS Routing Software Suite [10.4R2.6]
JUNOS Web Management [10.4R2.6]

Modification History

2021-03-25: Updated the article terminology to align with Juniper's Inclusion & Diversity initiatives.