Task 3.5 Back-up interface

I must have spent 15 minutes looking for the "Backup" command in the CONFIG GUIDE.  I am trying to find the documentation for all of my questions so that I can quickly read the sections.  I looked everywhere except the WAN Config Chapter (where the command was burried)!  Master Index came to the rescue.

 

Anyway, here is the link:  http://www.cisco.com/en/US/partner/docs/ios/wan/configuration/guide/wan_cfg_frm_rly_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1002431

 

NET-OG

Comments

  • Is there an equivalant to ospf database, BGP Table, or Eigrp topology for static routes?

     

     

    For instance two tasks in IP ROuting 3.4 and 3.5 had examples where there is a route being rperessed due to the inferior AD or the Standby command (3.4 and 3.5 respectively).

     

    Can we see this internal holding area for the routes that are "waiting" to be added to the route table?  Is is simply a configuration scan job on the IOS?

    IF someone knows please share...

    Moving on.

     

     


    NET_OG

  • Hi,

    I don't think there is anything like this. To see my static routes I usually type "sh run | inc ip route" and work it out from there.

    Regards,

    Chris

  •  

    I configure R4 with physical serial interface s0/0 instead of s0/0.1. It is NOT working! The backup interface never come up and the status is disabled.

    RSRack1R4(config-if)#do sh run int s0/0
    Building configuration...

    Current configuration : 199 bytes
    !
    interface Serial0/0
     backup delay 3 60
     backup interface Serial0/1
     ip address 155.1.0.4 255.255.255.0
     encapsulation frame-relay
     clock rate 2000000
     frame-relay interface-dlci 405
    end
    RSRack1R4(config-if)#do sh run int s0/1
    Building configuration...

    Current configuration : 92 bytes
    !
    interface Serial0/1
     ip address 155.1.45.4 255.255.255.0
     shutdown
     clock rate 64000
    end

    RSRack1R4(config-if)#do sh run | i ip route
    ip route 150.1.5.0 255.255.255.0 Serial0/1
    ip route 150.1.5.0 255.255.255.0 155.1.0.5

    RSRack1R4(config-if)#do sh backup
    Primary Interface   Secondary Interface   Status
    -----------------   -------------------   ------
    Serial0/0           Serial0/1             normal operation

    RSRack1R4(config-if)#do sh ip int b
    Interface                  IP-Address      OK? Method Status                Protocol
    FastEthernet0/0            204.12.1.4      YES NVRAM  up                    up
    Serial0/0                  155.1.0.4       YES manual up                    up
    Serial0/0.1                unassigned      YES manual up                    up
    FastEthernet0/1            155.1.146.4     YES NVRAM  up                    up
    Serial0/1                  155.1.45.4      YES NVRAM  standby mode          down

    I shutdown the s0/0 interface

    RSRack1R4(config-if)# shut
    *Mar  1 01:42:02.843: BACKUP(Serial0/0): event = primary interface shutdown
    *Mar  1 01:42:02.843: BACKUP(Serial0/0): secondary interface (Serial0/1) moved to standby
    *Mar  1 01:42:02.847: BACKUP(Serial0/0): changed state to "disabled"
    RSRack1R4(config-if)#
    *Mar  1 01:42:04.859: %LINK-5-CHANGED: Interface Serial0/0, changed state to administratively down
    *Mar  1 01:42:05.859: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to down
    *Mar  1 01:42:05.863: BACKUP(Serial0/0): event = primary interface went down
    *Mar  1 01:42:05.863: BACKUP(Serial0/0): backup is currently disabled on this interface

    Then, the backup interface s0/1 become disabled

    RSRack1R4(config-if)#do sh ip int b
    Interface                  IP-Address      OK? Method Status                Protocol
    FastEthernet0/0            204.12.1.4      YES NVRAM  up                    up
    Serial0/0                  155.1.0.4       YES manual administratively down down
    Serial0/0.1                unassigned      YES manual administratively down down
    FastEthernet0/1            155.1.146.4     YES NVRAM  up                    up
    Serial0/1                  155.1.45.4      YES NVRAM  standby mode/disabled down

    RSRack1R4(config-if)#do sh ip route 150.1.5.5
    % Subnet not in table

    Anyone encounter this issue?

     

  • Your Serial 0/1 is shutdown, it needs to be no shutdown in order to be managed by the backup command on the other interface.

    Kind regards

  •  

    I configure R4 with physical serial interface s0/0 instead of s0/0.1. It is NOT working! The backup interface never come up and the status is disabled.

    Anyone encounter this issue?

     

    Change the encapsulation method of the interface Serial 0/0 to something else lke in the following configuration and it will work.

    interface s0/0

    no encapsulation frame-relay

    encapsulation ppp

     

    Hope this help!

  • Hi,

       This may be IOS dependent; you have two options which work:

    1. use subinterface on the primary interface; shut it down and backup should work.

    2. try to invalidate the primary interface by shutting the remote end of it.

    Good luck with your studies!

  • OK, so I'm having the same problem described here.  I can never get the interface to fail over to the S0/1.  Was there ever a resolution to this?

     

    Thanks,

     

    Warjack

  • So I got it to work.....had to shut the parent interface down for the frame interface on router 4 (S0/0).  If I shut the subinterface, it shuts the feature down as well as the interface.....

     

    Warjack

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