Re: Backup interface

Hi,

This old thread can throw some lights on the issue..
http://www.groupstudy.com/archives/ccielab/200805/msg01204.html

-HTH
Kaushal

On Sat, Jul 18, 2009 at 2:20 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
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Sat Jul 18 2009 - 12:27:17 ART