Re: Backup interface

Hi Khoa,

The problem are enforcing interface "shutdown" primary interface by yourself
and using "main" Frame-Relay interface.

1. Firstly: When you enforce shutdown the primary interface, IOS enough
clever to know you do it by yourself and It does not propose the backup
interface to primary role. IF you shut FR-SW or the other side of FR, the
backup interface operation work normally.
2. Second: You are using main FR interface as primary, so when the other
frame-relay side is down, the primary is also up --> Backup interface does
work as you expect. Solution are using point-to-point FR interface as
primary interface or EEK to detect the status of the other FR side.

Best regards,
But Nguyen.

On Sun, Jul 19, 2009 at 2:43 AM, ALL From_NJ <all.from.nj_at_gmail.com> wrote:

> 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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> > >
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> >
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> >
>
>
> --
> Andrew Lee Lissitz
> all.from.nj_at_gmail.com
>
>
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>
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Received on Mon Jul 20 2009 - 09:29:46 ART