cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Announcements

Cisco announces new innovations in SD-WAN, ISRs, SD-WAN Services, and Catalyst 9000 Series switches


134
Views
0
Helpful
2
Replies
Beginner

IP SLA flapping using ICMP delay within GNS3 LAB

I am trying to figure out why the SLA is flapping between 10.1.2.2 and 10.1.3.2 every 15 seconds. The delay is below 60 Milliseconds and it still flaps to 2nd static route 10.1.3.2. Also, even if I shut down the interface on R2 , 10.1.2.2 still shows up in the routing table during the consistent flapping. I do have EIGRP configured as well. But I would think that the static entries would take precedence over the dynamic route since it has a lower AD. Here is the SLA configuration I have !

ip sla 1

icmp-echo 10.1.6.2 source-ip 10.1.1.1

threshold 60

frequency 5

 

track 1 ip sla 1

delay down 5 up 5

ip sla schedule 1 life forever start-time now

 

ip route 10.1.6.0 255.255.255.0 10.1.2.2 track 1

ip route 10.1.6.0 255.255.255.0 10.1.3.2 2

However I am getting this response even if the connection to router 2 to is down.

Router(config)# *Jan 2 17:00:03.150: %TRACK-6-STATE: 1 ip sla 1 state Down -> Up

Router(config)# *Jan 2 17:00:18.158: %TRACK-6-STATE: 1 ip sla 1 state Up -> Down

Router(config)# *Jan 2 17:00:33.166: %TRACK-6-STATE: 1 ip sla 1 state Down -> Up

Router(config)# *Jan 2 17:00:48.176: %TRACK-6-STATE: 1 ip sla 1 state Up -> Down

Router(config)# *Jan 2 17:01:03.180: %TRACK-6-STATE: 1 ip sla 1 state Down -> Up

GNS3 Topology.PNG

Everyone's tags (3)
2 REPLIES

Re: IP SLA flapping using ICMP delay within GNS3 LAB

Run the following command and paste the results.

 

deb ip sla trace

P.Williams
Highlighted
VIP Advisor

Re: IP SLA flapping using ICMP delay within GNS3 LAB

Hello

Try changing the sla destination to the 10.1.4.2, as in that case any reachabilty issue to that destination will lose connectivity to 10.1.6.2 on that route path only, Because as it stands currently the ip sla is seeing 10.1.6.2 via its alternative route path as being up so sla transitions up again because thr ip sla source/destination is reachable, then the cycle continues.....



kind regards
Paul

Please don't forget to rate any posts that have been helpful.
CreatePlease to create content
Content for Community-Ad

Blog-Cisco Community Designated VIP Class of 2019