Active Link Sensing in HSRP

[abidrana254]

Hi,

I am testing failover topology; here i have two redundant WAN links between Main and DR site. I have configured HSRP on both end routers where 192.168.15.10 is VIP on DR site and 192.168.15.5 is VIP at Main Site and pointed firewall towards VIP, see diagram

Both ends WAN.RTR.XX have HSRP priority, so traffic passing through them, as soon sa i down the any WAN router end to end traffic fails e.g i down WAN.RTR.Main traffic didnt pass end to end where bkup routers are still up and working, so when i down other side WAN router WAN.RTR.DR, then traffic passed end-to-end.

My question is, is there any port sensing or monitoring option in routers or firewalls? when it sees that one end high priority router (WAN) get down then it automatically shut other side WAN router and all traffic takes path from bkup routers.

Best Regards

Abid Rana 

[sukanyachavan]

Hi Abid,

You need to track WAN interface in HSRP for any remote end failure sensing.

HTH,

Sukanya

[abidrana254]

Hi Sukayana,

Thanks for the help, it's working now. I have added following commands on both WAN routers

track 12 ip route 192.168.1x.0 255.255.255.0 reachability

interface FastEthernet0/1

standby 1 priority 120

standby 1 preempt

standby 1 track 12 decrement 30

but as soon as i down any WAN router interface, it takes 2 minutes to bring up the bkup routers but as i up the WAN router there is no interuption and traffic passed fine.

What could be the reason? is there any role of bgp as i am running bgp on WAN routers

[sukanyachavan]

Hi Abid,

Can you share the following command outputs of all 4 routers, before I can comment, whether it is related to BGP or not.

show run | sec bgp

show ip bgp

show ip route

show ip bgp summary

HTH,

Sukanya

[sukanyachavan]

Hi Abid,

Alternative way to do same is with the following command

standby [group number] track [your wan interface] decrement [value with which you want to decrement]

HTH,

Sukanya