Task 3.5 Back-up interface
in IP Routing
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
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