From: Paul Howell (paul.howell@gmail.com)
Date: Tue Aug 07 2007 - 04:40:02 ART
I would take off the backup interface configuration and try to manually get
Serial 2/1 up. I'm guessing it will do the same thing, come up then go back
down after a short bit.
Is S2/1 connected directly to another router? Is the other router's
interface enabled? If so, is the clock rate set on the DCE side? Also,
check that the layer 2 encapsulation is matching on both sides (both HDLC,
for instance).
- Paul
On 8/4/07, NITIN NITIN <ccie_study_123@yahoo.com> wrote:
>
> Hi Experts ,
> Please suggest , my backup interface not coming up ......
> Actually , it comes up and after few seconds goes down
>
> Rack1R5#sh backup
> Primary Interface Secondary Interface Status
> ----------------- ------------------- ------
> Serial2/0.54 Serial2/1 backup mode
> Rack1R5#sh backup
> Primary Interface Secondary Interface Status
> ----------------- ------------------- ------
> Serial2/0.54 Serial2/1 backup mode
> Rack1R5#
> *Aug 4 15:39:23.275: BACKUP(Serial2/0.54): event = primary interface came
> up
> *Aug 4 15:39:23.275: BACKUP(Serial2/0.54): changed state to "waiting to
> revert"
> *Aug 4 15:39:23.283: BACKUP(Serial2/0.54): event = timer expired on
> primary
> *Aug 4 15:39:23.319: BACKUP(Serial2/0.54): secondary interface
> (Serial2/1) moved to standby
> *Aug 4 15:39:23.319: BACKUP(Serial2/0.54): changed state to "normal
> operation"
> Rack1R5#sh backup
> *Aug 4 15:39:23.387: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor
> 173.1.45.4 (Serial2/1) is down: interface down
> Rack1R5#sh backup
> Primary Interface Secondary Interface Status
> ----------------- ------------------- ------
> Serial2/0.54 Serial2/1 normal operation
> Rack1R5#
> *Aug 4 15:39:25.291: %LINK-5-CHANGED: Interface Serial2/1, changed state
> to standby mode
> *Aug 4 15:39:26.291: %LINEPROTO-5-UPDOWN: Line protocol on Interface
> Serial2/1, changed state to down
> *Aug 4 15:39:26.291: BACKUP(Serial2/1): event = secondary interface went
> down
> Rack1R5#
> *Aug 4 15:40:04.135: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor
> 173.1.54.4 (Serial2/0.54) is up: new adjacency
> Rack1R5#sh ip int br
> Rack1R5#sh ip int brief
> Interface IP-Address OK? Method
> Status Protocol
> FastEthernet0/0 192.10.1.5 YES
> NVRAM up up
> FastEthernet1/0 173.1.5.5 YES
> NVRAM up up
> Serial2/0 unassigned YES
> NVRAM up up
> Serial2/0.54 173.1.54.5 YES
> NVRAM up up
> Serial2/0.125 173.1.125.5 YES
> NVRAM up up
> Serial2/1 173.1.45.5 YES NVRAM standby
> mode down
> Serial2/2 unassigned YES NVRAM administratively
> down down
> Serial2/3 unassigned YES NVRAM administratively
> down down
> Loopback0 150.1.5.5 YES
> NVRAM up up
> Rack1R5#sh run in
> Rack1R5#sh run interface se
> Rack1R5#sh run interface serial 2/0.54
> Building configuration...
> Current configuration : 156 bytes
> !
> interface Serial2/0.54 point-to-point
> backup interface Serial2/1
> ip address 173.1.54.5 255.255.255.0
> frame-relay interface-dlci 504
> class R5
> end
> Rack1R5#sh conf | b map-class
> map-class frame-relay R5
> frame-relay end-to-end keepalive mode bidirectional
>
>
> Rack1R4#sh conf | b map-class
> map-class frame-relay R4
> frame-relay end-to-end keepalive mode bidirectional
>
>
> Regards
>
>
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