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3.5 shutting FR subinterface causing backup interface being disabled?

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Hi Guys,

According the the solution guide, we are disabling the frame relay main interface on R4 to trigger the backup interface to come up.

However when I try to disbale the frame relay subinterface, the backup point to point interface didn't come up instead it went to disabled mode? any idea?

 

before shut down the interface


Rack1R4#sh ip int brief
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            204.12.1.4      YES manual up                    up
Serial0/0                  unassigned      YES unset  up                    up
Serial0/0.1                155.1.0.4       YES manual up                    up
FastEthernet0/1            155.1.146.4     YES manual up                    up
Serial0/1                  155.1.45.4      YES manual standby mode          down
Loopback0                  150.1.4.4       YES manual up                    up

After shut down the interface

Rack1R4#debug backup
Backup events debugging is on
Rack1R4#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Rack1R4(config)#int se0/0.1
Rack1R4(config-subif)#shut
Rack1R4(config-subif)#
*Mar  5 00:31:36.584: BACKUP(Serial0/0.1): event = primary interface shutdown
*Mar  5 00:31:36.588: BACKUP(Serial0/0.1): secondary interface (Serial0/1) moved to standby
*Mar  5 00:31:36.592: BACKUP(Serial0/0.1): changed state to "disabled"
*Mar  5 00:31:37.576: BACKUP(Serial0/0.1): event = primary interface went down
*Mar  5 00:31:37.576: BACKUP(Serial0/0.1): backup is currently disabled on this interface
Rack1R4(config-subif)#end
Rack1R4#sh
*Mar  5 00:31:42.996: %SYS-5-CONFIG_I: Configured from console by console
Rack1R4#sh ip int brief
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            204.12.1.4      YES manual up                    up
Serial0/0                  unassigned      YES unset  up                    up
Serial0/0.1                155.1.0.4       YES manual administratively down down
FastEthernet0/1            155.1.146.4     YES manual up                    up
Serial0/1                  155.1.45.4      YES manual standby mode/disabled down
Loopback0                  150.1.4.4       YES manual up                    up
Rack1R4#sh backup
Primary Interface   Secondary Interface   Status
-----------------   -------------------   ------
Serial0/0.1         Serial0/1             disabled

 

 


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