Re: Backup interface

Best way to test this is to remove the cable if this is live equip ...
shutdown command can do 'funky' things when testing timers, hsrp, backup
interface ...

When you enter the shutdown command, the router thinks you did it on
purpose, and will sometimes 'help' you. ;-)

If possible, removing the cable is the best way to test these things. HTH,

Andrew Lissitz

On Sat, Jul 18, 2009 at 5:20 AM, Ravi Singh <way2ccie_at_googlemail.com> wrote:

> HI Khoa,
>
> Shutting down an interface will not give you the result you are
> expecting..Try shutting the PVC down by removing the encapsulation/DLCI or
> try another means of making the line protocol down of the serial interface
> rather than shutting it down..
>
> Ravi
>
> On Sat, Jul 18, 2009 at 10:14 AM, Anh Khoa Le Viet <lvakhoa_at_gmail.com
> >wrote:
>
> > Dear Group,
> >
> > I'm doing a practice lab and really stuck with "backup interface"
> > configuration. Would anyone please help to advise?
> >
> > Question: R5 -----------Ethernet --------- R4
> > |-----------Frame Relay---------|
> > Ethernet link between R4 and R5 has been installed as a backup of
> the
> > Frame Relay circuit between them. backup interface should wait for 30s
> > after
> > the FR int come up before disabled.
> >
> > My configuration:
> > r5: interface Serial0/0
> > backup delay 0 30
> > backup interface FastEthernet0/1
> > ip address 129.1.54.5 255.255.255.0
> > encapsulation frame-relay
> > frame-relay map ip 129.1.54.4 504 broadcast
> > no frame-relay inverse-arp
> > frame-relay lmi-type cisco
> > interface FastEthernet0/1
> > ip address 129.1.45.5 255.255.255.0
> > duplex auto
> > speed auto
> > R4: interface Serial0/0.54 point-to-point
> > ip address 129.1.54.4 255.255.255.0
> > frame-relay interface-dlci 405
> > !
> > interface FastEthernet0/0
> > ip address 129.1.45.4 255.255.255.0
> > duplex auto
> > speed auto
> > Rack1R5(config-if)#do show ip int br
> > Interface IP-Address OK? Method
> > Status Protocol
> > FastEthernet0/0 129.1.58.5 YES manual up
> > up
> > Serial0/0 129.1.54.5 YES manual
> > up up
> > FastEthernet0/1 129.1.45.5 YES manual *standby mode
> > down *
> > As in Cisco Configuration Guide (Dial), for the "backup interface"
> > configuration, it just need "backup int fa0/1" and "delay 0 30" are
> enough
> > but when I do a shut in S0/0, the Fa0/0 turned *disabled*:
> > Rack1R5#show ip int br
> > Interface IP-Address OK? Method Status
> > Protocol
> > FastEthernet0/0 129.1.58.5 YES manual up
> > up
> > Serial0/0 129.1.54.5 YES manual administratively
> down
> > down
> > FastEthernet0/1 129.1.45.5 YES *manual standby
> > mode/disabled
> > down *
> >
> > And output of debug backup:
> > Rack1R5(config-if)#
> > Jul 17 16:13:50.534: BACKUP(Serial0/0): event = primary interface
> shutdown
> > Jul 17 16:13:50.534: BACKUP(Serial0/0): secondary interface
> > (FastEthernet0/1) moved to standby
> > Jul 17 16:13:50.534: BACKUP(Serial0/0): changed state to "disabled"
> > Rack1R5(config-if)#
> > Jul 17 16:13:52.541: %LINK-5-CHANGED: Interface Serial0/0, changed state
> to
> > administratively down
> > Jul 17 16:13:53.543: %LINEPROTO-5-UPDOWN: Line protocol on Interface
> > Serial0/0, changed state to down
> > Jul 17 16:13:53.543: BACKUP(Serial0/0): event = primary interface went
> down
> > Jul 17 16:13:53.543: *BACKUP(Serial0/0): backup is currently disabled on
> > this interface*
> > Rack1R5(config-if)#
> >
> > Am I missing something here? Why Fa0/0 do not come up as expected? :(.
> >
> > Thanks and best Regards,
> > Khoa
> >
> >
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-- 
Andrew Lee Lissitz
all.from.nj_at_gmail.com
Blogs and organic groups at http://www.ccie.net