Need help in discovering why my pings fail

janez_drk

Hi to all,
and I hope that you can help me with the problem I have, or put me on a good way to solve it.
Here is the situation:
I have two Cisco routers (2911) on a WAN link( MPLS L2 connection from ISP, 19Mbps, same ISP on both locations).
Router A is connected to Interconnectivity Switch and then to ISP - same is on other location.

When I ping from router A to router B i have lot of faild pings.. I can't figure out what seems to be problem becuse I'm pinging interfaces that are on the same subnet, there is no to much traffic on the WAN links - some 30% of BW... I've looked the CPU utilization of the devices that the traffic goes through - it's around 30-40%....
show process memory
Processor Pool Total: 348693504 Used: 31246492 Free: 317447012
I/O Pool Total: 37748736 Used: 17251568 Free: 20497168

show process cpu
CPU utilization for five seconds: 13%/12%; one minute: 12%; five minutes: 13%

I've also looked interfaces - ther is no errors or dropps ''MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255''



What is interested to me is that I get constantly good replay but then just one ping fails and so on...

from my PC
Reply from x: bytes=32 time=4ms TTL=254
Reply from x: bytes=32 time=4ms TTL=254
Reply from x: bytes=32 time=4ms TTL=254
Reply from x: bytes=32 time=4ms TTL=254
Reply from x: bytes=32 time=4ms TTL=254
Reply from x: bytes=32 time=4ms TTL=254
Reply from x: bytes=32 time=4ms TTL=254
Request timed out.
Reply from x: bytes=32 time=4ms TTL=254
Reply from x: bytes=32 time=4ms TTL=254
Reply from x: bytes=32 time=4ms TTL=254
Reply from x: bytes=32 time=4ms TTL=254
Reply from x: bytes=32 time=4ms TTL=254
Reply from x: bytes=32 time=4ms TTL=254
Reply from x: bytes=32 time=4ms TTL=254




From Cisco 2911 router A to B
!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!...!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!.!!!!!!!!!.!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!.!!!!!!!!!!!
!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!
!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!.!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!
!!!!!!!!!!!!.!!!!!.!!!!!!!!.!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!.!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!
!.!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!..!!!!!!!.!!!!!!!!!!!!!!!!!.!!!!!
!!!!!!!!!.!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!
!!!!!.!!!!..!!!!!!!!
Success rate is 96 percent (962/1000), round-trip min/avg/max = 4/4/8 ms



I'm running out of ideas...

Thanks

networker050184

Seeing any drops on the interfaces? Are service policies applied? Have you had the ISP test the circuits? First thought was control plane policing, but the drops look a little erratic for that.

xXErebuS

Have you tried the ping test when no traffic is on the ISP line? 30% of BW could potentially be something more like 300% if they quoted you a burstable rate.

Have you tried pinging from Host 1 site1 to Router 1 and Host 2 site 2 to Router 2 to see if you have any drops - this could potentially identify the side that may have an issue with its router.

deth1k

How about pining the other end of /30?

janez_drk

Sorry for not answering sooner.. I have solved this problem - after testing all the things that I could and totally breaking and simplifying my configurationes. I think that you can easilly guess where was the problem - ISP.. I've been conntacting ISP and they told me that everything is fine, they don't have any problems on network and so on. And then I started to troubleshoot our network... After conntacting ISP once again and moving case to higher level it turns out that our ISP is renting one part of link from other ISP and that other ISP had errors in his network and didn't enabled bandwidth of 18Mbps... they fixed the problem in their network (on link) and enabled 18Mbps.. link is now almost perfect..

I'm so tired of fighting with ISP - we have 2 (one for each half of country) and they do what they want and how they want (

I want to thank you for answers and for your help..