01-02-2008 07:33 PM - edited 03-05-2019 08:15 PM
Dear all,
When two routers running HSRP that track tunnel interface, configuration as below:
IBSSCC1#sh run int vlan1
Building configuration...
Current configuration : 250 bytes
!
interface Vlan1
description Connection to Customer LAN
ip address 10.122.222.6 255.255.0.0
ip nat inside
ip virtual-reassembly
ip ospf cost 10
standby 1 ip 10.122.222.2
standby 1 priority 110
standby 1 preempt
standby 1 track Tunnel0
There is OSPF configured between both two spoke routers to hub router.
Today during the outage that, OSPF keep flapping on active HSRP router, however, there is no link flapping can be seen, tunnel interface shows up, but the latency is huge when reach to hub router which cause OSPF unstable, since HSRP is track to tunnel0, so it wont trigger HSRP function take place, may i see some advice how to deal with this situation? is that advisable that add keepalive under the tunnel interface?
Thank you,
01-02-2008 09:17 PM
hi,
Try configuring your tunnel 0 interface with "keepalive" command.This wil make the tunnel interface to behave like physical interface and the tunnel0 will go down when the other end tunnel is down...
arun :)
01-03-2008 02:25 AM
Thanks Arun!
I tried to add keepalive command 'keepalive 9 5', however, once I finished the command, the OSPF dropped after few seconds, the default keepalive is 10 second, I am not sure what is the value is recommended to put that monitor the tunnel interface and not interrupt the ospf as well.
Please advise. thank you.
01-03-2008 03:02 AM
i think the value you configured is ok.
here keepalive packet is send every 9 sec and if it doesnt receive anything within 5 retries then tunnel is set to down.
Do the tunnel is geting down now,or only ospf is droping but tunnel is up??
have you configured on both end of the tunnel ???If not check out that...
01-08-2008 05:14 AM
HI,
Best values for Keepalive are:
"keepalive 0 3"
>> Try this.
Do RATE if HELPS
Best Regards,
Guru Prasad R
01-09-2008 12:00 AM
What is the latency you are seeing on your tunnel interface? What are your timers for OSPF? If your timers for OSPF are very strict, it can think the link is down while it is not. On the other hand, why do you have such high latency on your tunnel interface?
If you set keepalives to 0 as Guru has suggested, your interface will ALWAYS stay up. You can do this on any interface you want turned on without any cables connected.
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