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[EX] Behavior of OSPF Dead Timers on the EX8216 backup with Graceful Routing Engine Switchover (GRES) and Nonstop Routing enabled

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Article ID: KB20725 KB Last Updated: 05 Apr 2021Version: 2.0
Summary:

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.


 [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

 
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


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


 [edit]
root@BK # show routing-options
nonstop-routing;
}


 [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.
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