01-10-2016 11:21 PM - edited 03-05-2019 03:05 AM
Base on diagram attached bellow:
R1 Configure
interface FastEthernet0/0
ip address 172.1.1.1 255.255.255.0
no shutdown
duplex half
standby version 2
standby 1 ip 172.1.1.254
standby 1 track fa0/0
standby 1 track fa1/0
standby 1 preempt
interface FastEthernet1/0
ip address 172.2.2.1 255.255.255.0
no shutdown
duplex auto
speed auto
standby version 2
standby 1 ip 172.2.2.254
standby 1 priority 120
standby 1 preempt
standby 1 track fa0/0
standby 1 track fa1/0
R2 Configure
interface FastEthernet0/0
ip address 172.1.1.2 255.255.255.0
no shutdown
duplex half
standby version 2
standby 1 ip 172.1.1.254
standby 1 track fa0/0
standby 1 track fa1/0
interface FastEthernet1/0
ip address 172.2.2.2 255.255.255.0
no shutdown
duplex auto
speed auto
standby version 2
standby 1 ip 172.2.2.254
standby 1 track fa0/0
standby 1 track fa1/0
Problem is that when one of interface on R1(active) down, PC connect to cloud 3 cannot access to ESW1.
if interface fa0/0 down then show standby
show standby
R1 R2
fa0/0 fa0/0
standby Active
fa1/0 fa1/0
active standby
so both side cannot communicate each other( PC connected to cloud 3 cannot contact to ESW1)
Q: How to fix this issue? How to make fa1/0 to standby if FA0/0 down?
Thank for support
Ratha
Solved! Go to Solution.
01-11-2016 12:54 AM
Change the standby priority from 120 to 105.
I'm not sure what platform or version you are using, but you would normally have some track commands, like:
track 1 interface fa0/0 ip routing
Then you tell the interface to use the tracked object above.
int fa1/0
standby track 1
01-11-2016 07:34 AM
Philip has correctly identified an issue about tracking interfaces for HSRP. HSRP track looks for the interface status to change to down to trigger the track event. That works for point to point serial interfaces. But frequently for Ethernet interfaces you may lose connectivity over the interface but the interface status remains up. So frequently we need to use track commands to force the Ethernet interface into the down state when connectivity is lost.
But there is a more fundamental problem with this config. Even with the track command HSRP would not fail over as the original poster wants it to. The issue is that HSRP on R2 does not include the preempt command. Without preempt the router can not take over the active role even if the priority has changed. So the original poster needs to add the preempt command in HSRP on both interfaces of R2.
HTH
Rick
01-11-2016 12:54 AM
Change the standby priority from 120 to 105.
I'm not sure what platform or version you are using, but you would normally have some track commands, like:
track 1 interface fa0/0 ip routing
Then you tell the interface to use the tracked object above.
int fa1/0
standby track 1
01-11-2016 07:34 AM
Philip has correctly identified an issue about tracking interfaces for HSRP. HSRP track looks for the interface status to change to down to trigger the track event. That works for point to point serial interfaces. But frequently for Ethernet interfaces you may lose connectivity over the interface but the interface status remains up. So frequently we need to use track commands to force the Ethernet interface into the down state when connectivity is lost.
But there is a more fundamental problem with this config. Even with the track command HSRP would not fail over as the original poster wants it to. The issue is that HSRP on R2 does not include the preempt command. Without preempt the router can not take over the active role even if the priority has changed. So the original poster needs to add the preempt command in HSRP on both interfaces of R2.
HTH
Rick
01-11-2016 07:31 PM
01-12-2016 07:33 AM
You are quite welcome. I am glad that our suggestions were helpful. Thank you for using the rating system to mark this question as answered. This will help other readers in the forum to identify discussions that have helpful information.
HTH
Rick
01-12-2016 08:13 AM
Hi,
Did after changing the Standby Priority value did it works
01-17-2016 11:16 PM
after changing the Standby Priority value it not completely work, I have to add preempt on R2. However priority is a part of corrected answer.
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