HSRP ISSUE

[aprasad11]

Hi Guys,

Requesting for your assistance. I have a issue with HSRP. Despite having R1 Priority lower than R2. R1 does not become the standby router. 

Below is show outputs.  The flash i am using is c880data-universalk9-mz.150-1.M5.bin. Probably a IOS bug?

R1

show standby brief
P indicates configured to preempt.
|
Interface Grp Pri P State Active Standby Virtual IP
Fa4.846 1 150 P Init unknown unknown 202.151.24.124
Fa4.4091 255 150 P Init unknown unknown 10.150.194.51
Vl10 1 95 P Active local 10.10.0.2 10.10.0.1
Vl20 2 85 P Active local 10.20.0.2 10.20.0.1
Vl30 3 85 P Active local 10.30.0.2 10.30.0.1
Vl100 4 85 P Active local 10.100.0.2 10.100.0.1

R2

Interface Grp Pri P State Active Standby Virtual IP
Fa4.846 1 100 P Active local unknown 202.151.24.124
Fa4.4091 255 100 Active local unknown 10.150.194.51
Vl10 1 100 Standby 10.10.0.3 local 10.10.0.1
Vl20 2 100 Standby 10.20.0.3 local 10.20.0.1
Vl30 3 100 Standby 10.30.0.3 local 10.30.0.1
Vl100 4 100 Standby 10.100.0.3 local 10.100.0.1

[Mark Malone]

hi

are these directly connected router to router interfaces or through a layer 2 switch ?

can you post the running config of the hsrp off each router please and if there is a switch involved make sure there is no acl blocking hsrp multicast address and that stp is not blocking at layer 2 in the path the failover takes

[aprasad11]

Hi Mark,

They are connected via  a layer 2 switch. There are acl in layer 2 switch

R1 config

interface Vlan10
ip address 10.10.0.3 255.255.255.0
ip nat inside
ip virtual-reassembly
standby 1 ip 10.10.0.1
standby 1 priority 105
standby 1 preempt delay reload 60 sync 15
standby 1 name test
standby 1 track 1 decrement 10

#show standby brief
P indicates configured to preempt.

R1
Interface Grp Pri P State Active Standby Virtual IP
Fa4.846 1 150 P Init unknown unknown 202.151.24.124
Fa4.4091 255 150 P Init unknown unknown 10.150.194.51
Vl10 1 95 P Active local 10.10.0.2 10.10.0.1
Vl20 2 85 P Active local 10.20.0.2 10.20.0.1
Vl30 3 85 P Active local 10.30.0.2 10.30.0.1
Vl100 4 85 P Active local 10.100.0.2 10.100.0.1

R2 Config 

interface Vlan10
ip address 10.10.0.2 255.255.255.0
ip nat inside
ip virtual-reassembly
standby 1 ip 10.10.0.1
standby 1 name test

R2

show standby brief
P indicates configured to preempt.
|
Interface Grp Pri P State Active Standby Virtual IP
Fa4.846 1 100 P Active local unknown 202.151.24.124
Fa4.4091 255 100 Active local unknown 10.150.194.51
Vl10 1 100 Standby 10.10.0.3 local 10.10.0.1
Vl20 2 100 Standby 10.20.0.3 local 10.20.0.1
Vl30 3 100 Standby 10.30.0.3 local 10.30.0.1
Vl100 4 100 Standby 10.100.0.3 local 10.100.0.1

[Mark Malone]

Hi

There are acl in layer 2 switch

what is the acl in place doing ?

Is there only 1 layer 2 switch connected to each router 1 link  ?

is it Vlan 10 that's not working as it looks correct , Router 1 is currently active and router 1 is standby ?

Vl10 1 95 P Active local 10.10.0.2 10.10.0.1

Vl10 1 100 Standby 10.10.0.3 local 10.10.0.1

[aprasad11]

Hi ,

Issue was on preempt

[Jon Marshall · Accepted solution]

Your configuration of R1 shows a priority of 105 but you are tracking an interface and the output of "sh standby brief" shows a priority of 95.

So do you mean R1 is still active when the tracked interface goes down ?

If so this is because you have not configured preempt on R2 and without that R2 will not take over even with a higher priority.

Jon

[aprasad11]

thanks John. yes preempt was the issue.