Simple backup, Primary and Secondary Link

I have simple scenario dan test about backup simple backup using ppp encapsulation link and primary link using frame-relay link. For simulation use 'no frame-relay interface-dlci 513' disable frame-relay DLCI as though there is problem from frame-relay cloud.

'backup delay 60 300' : 60s for hold time backup operation, 300s for revert time to normal operation

#Primary Link

interface Serial1/0.1 point-to-point
 ip address 132.1.35.5 255.255.255.0
 backup delay 60 300
 backup interface Serial1/1
 frame-relay interface-dlci 513   
end

#Secondary Link

interface Serial1/1
 ip address 132.1.45.5 255.255.255.0
 encapsulation ppp
 ppp authentication chap
 ppp chap hostname ROUTER5
 
#(config-subif)#no frame inter 513

#(config-subif)#
*Mar  2 10:07:24.663: BACKUP(Serial1/0.1): event = primary interface went down
*Mar  2 10:07:24.663: BACKUP(Serial1/0.1): changed state to "waiting to backup"

#(config-subif)#
*Mar  2 10:08:24.663: BACKUP(Serial1/0.1): event = timer expired on primary
#(config-subif)#
*Mar  2 10:08:27.679: BACKUP(Serial1/0.1): secondary interface (Serial1/1) made active
*Mar  2 10:08:27.683: BACKUP(Serial1/0.1): changed state to "backup mode"
*Mar  2 10:08:27.683: %LINK-3-UPDOWN: Interface Serial1/1, changed state to up
#(config-subif)#
*Mar  2 10:08:27.683: BACKUP(Serial1/1): event = secondary interface came up
#(config-subif)#
*Mar  2 10:08:30.683: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/1, changed state to up

#(config-subif)#frame inter 513   
#(config-fr-dlci)#
*Mar  2 10:11:54.383: BACKUP(Serial1/0.1): event = primary interface came up
*Mar  2 10:11:54.387: BACKUP(Serial1/0.1): changed state to "waiting to revert"

#(config-fr-dlci)#do sh backup
Primary Interface   Secondary Interface   Status
-----------------   -------------------   ------
Serial1/0.1         Serial1/1             waiting to revert (260 more seconds)

#(config-fr-dlci)#
*Mar  2 10:16:54.387: BACKUP(Serial1/0.1): event = timer expired on primary
*Mar  2 10:16:54.419: BACKUP(Serial1/0.1): secondary interface (Serial1/1) moved to standby
*Mar  2 10:16:54.423: BACKUP(Serial1/0.1): changed state to "normal operation"
#(config-fr-dlci)#
*Mar  2 10:16:56.391: %LINK-5-CHANGED: Interface Serial1/1, changed state to standby mode
*Mar  2 10:16:57.391: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/1, changed state to down
*Mar  2 10:16:57.395: BACKUP(Serial1/1): event = secondary interface went down

#(config-fr-dlci)#do sh backup  
Primary Interface   Secondary Interface   Status
-----------------   -------------------   ------
Serial1/0.1         Serial1/1             normal operation