Connection backup issue.

Unanswered Question
Mar 22nd, 2012

I respectively connected two routers with two ethernet port. one is primary and second is backup. However, after i shut down primary port. the backup mode of backup connection change to disabled instead of acting as backup... Could someone help me?

R1

!

interface Ethernet0/0

backup interface Ethernet0/1

ip address 172.16.1.1 255.255.255.252

half-duplex

!

interface Ethernet0/1

ip address 172.16.1.5 255.255.255.252

half-duplex


R2

!

interface Ethernet0/0

ip address 172.16.1.2 255.255.255.252

half-duplex

!

interface Ethernet0/1

ip address 172.16.1.6 255.255.255.252

half-duplex

!


Situation after E0/0 shutdown

Interface IP-Address OK? Method Status Prot ocol

Ethernet0/0 172.16.1.1 YES manual administratively down down

Ethernet0/1 172.16.1.5 YES manual standby mode/disabled down

Ethernet0/2 unassigned YES unset administratively down down

Ethernet0/3 unassigned YES unset administratively down down

I have this problem too.
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kmckayMRU Fri, 03/23/2012 - 08:38

Using backup interfaces is primarily used for Dialup/ISDN lines, is that what you are using? Also, I do believe that a manual shutdown of the primary interface does not trigger the failover - try yanking the cable.

Secondly, if this is traditional Ethernet, you may be best using IOS SLA with tracking objects for failover.

drachen123 Fri, 03/23/2012 - 08:44

I am using the backup on two ethernet connections. and since i am testing the topology on GNS3, i can not yank the cable. :-P and i will try use IOS SLA.

Thanks alot.

zhaoqining

From: kmckayMRU

Date: 2012-03-24 01:38

To: Zhao Qining

Subject: - Re: Connection backup issue.

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Re: Connection backup issue.

created by Kyle McKay in Getting Started with LANs - View the full discussion

Using backup interfaces is primarily used for Dialup/ISDN lines, is that what you are using? Also, I do believe that a manual shutdown of the primary interface does not trigger the failover - try yanking the cable.

Secondly, if this is traditional Ethernet, you may be best using IOS SLA with tracking objects for failover.

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Posted March 22, 2012 at 5:56 AM
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