Connection backup issue.

drachen123 · ‎03-22-2012

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

Kyle McKay · ‎03-23-2012

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 · ‎03-23-2012

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.

Home

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.

Reply to this message by going to Home

Start a new discussion in Getting Started with LANs at Home