01-26-2007 11:34 PM - edited 03-03-2019 03:31 PM
I have 2620 and 3620 configured as HSRP group which have 64k serial link conected to other side router repectively. It seems the operation is ok as if 2620 serial link down, 3620 serial link will be take effect as back up link. One problem is if 2620 Wan link resume. then I need to wait ~1 min to see the traffic go through 3620 change over to 2620 serial again. I think the time is quick long. Can I make it shorter ?
Router 2620
interface Ethernet0/0
description LAN
ip address 10.1.1.1 255.255.255.0
half-duplex
standby 20 ip 10.1.1.3
standby 20 priority 110
standby 20 preempt
standby 20 track Serial0/0
!
interface Serial0/0
description to 1605
ip address 172.20.1.2 255.255.255.252
no fair-queue
!
interface Ethernet0/1
no ip address
shutdown
half-duplex
!
router ospf 1
log-adjacency-changes
network 10.1.1.0 0.0.0.255 area 0
network 172.20.1.0 0.0.0.3 area 0
Router 3620
interface Ethernet1/0
ip address 10.1.1.2 255.255.255.0
no ip redirects
no ip directed-broadcast
standby 20 priority 90 preempt
standby 20 ip 10.1.1.3
standby 20 track Serial1/0
!
interface Serial1/0
ip address 172.20.1.6 255.255.255.252
no ip directed-broadcast
no ip mroute-cache
no fair-queue
!
router ospf 1
network 10.1.1.0 0.0.0.255 area 0
network 172.20.1.4 0.0.0.3 area 0
Solved! Go to Solution.
01-27-2007 08:50 AM
Your problem is not HSRP, it's OSPF. OSPF needs time to converge and depending on the OSPF network type, it can take that long. What type of OSPF network are you running between sites ?
You don't want to failover to a router that has no external routes right away so HSRP is helping you on this delay. You can also alter the HSRP timers but I suggest you deal with the routing protocol timers first.
01-27-2007 09:43 AM
Friend,
Try modifying the standby priority of the 3620 router to 105.
standby 20 priority 105 or use
standby 20 track Serial0/0 25
Since you are tracking the serial interface and if it goes down, by default HSRP priority will be reduced by 10 and will still remain the Active Peer and depends on the routing protocol for the traffic reroute
Also as edison said, check the network type of your serial interfaces and try to tune the timers accordingly
HTH, rate if it does
Narayan
01-27-2007 08:50 AM
Your problem is not HSRP, it's OSPF. OSPF needs time to converge and depending on the OSPF network type, it can take that long. What type of OSPF network are you running between sites ?
You don't want to failover to a router that has no external routes right away so HSRP is helping you on this delay. You can also alter the HSRP timers but I suggest you deal with the routing protocol timers first.
01-27-2007 09:43 AM
Friend,
Try modifying the standby priority of the 3620 router to 105.
standby 20 priority 105 or use
standby 20 track Serial0/0 25
Since you are tracking the serial interface and if it goes down, by default HSRP priority will be reduced by 10 and will still remain the Active Peer and depends on the routing protocol for the traffic reroute
Also as edison said, check the network type of your serial interfaces and try to tune the timers accordingly
HTH, rate if it does
Narayan
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