Re: Backup interface

Hi But and All,

Thanks for your replies. I'm clear with this one now.

Best Regards,
Khoa

On Mon, Jul 20, 2009 at 10:29 AM, But Nicky <lyredhair_at_gmail.com> wrote:

> 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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>>
>> --
>> Andrew Lee Lissitz
>> all.from.nj_at_gmail.com
>>
>>
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Received on Mon Jul 20 2009 - 17:08:38 ART