12-09-2010 02:39 PM
Hello,
We recently switched to a T1 connection for a remote site, all of a sudden the Jitter Time in our IP SLA jumped to as high as 77 million (from 1 or 2... not million, just one or two). Does anything look wrong? Here's the config & stat output:
ip sla 10
icmp-jitter 10.xx.xx.xx num-packets 20 interval 40
frequency 600
ip sla schedule 10 life forever start-time now
Round Trip Time (RTT) for Index 10
Type of operation: icmpJitter
Latest RTT: 8 milliseconds
Latest operation start time: *22:36:54.404 UTC Thu Dec 9 2010
Latest operation return code: Over threshold
RTT Values:
Number Of RTT: 20 RTT Min/Avg/Max: 8/8/11
Latency one-way time:
Number of Latency one-way Samples: 0
Source to Destination Latency one way Min/Avg/Max: 0/0/0
Destination to Source Latency one way Min/Avg/Max: 0/0/0
Jitter Time:
Number of Jitter Samples: 19
Source to Destination Jitter Min/Avg/Max: 77815000/77815000/77815000
Destination to Source Jitter Min/Avg/Max: 77815000/77815000/77815001
Packet Late Arrival: 0
Out Of Sequence: 0
Source to Destination: 0 Destination to Source 0
In both Directions: 10
Packet Skipped: 0
Packet Loss: 0
Loss Period Length Min/Max: 0/0
Number of successes: 0
Number of failures: 1
Operation time to live: Forever
Thank you for any input!
James
12-12-2010 11:54 AM
What version of IOS is this? How many collectors are configured on this device? Verify that the clock is the same on both the source and the target. This typically means NTP.
12-13-2010 01:03 PM
Version 12.3(8r)YH12 (model 1811 remote site), Version 12.4(13r)T11 (model 3825, primary router). There are two IP SLAs configured. The second one (IP SLA 20) is normal. Here's the statistics for the second one to compare. The funny part is the route to the IP address in the IP SLA 20 goes through the first IP address (primary router) in IP SLA 10.
Round Trip Time (RTT) for Index 20
Type of operation: icmpJitter
Latest RTT: 19 milliseconds
Latest operation start time: 13:52:25.339 UTC Mon Dec 13 2010
Latest operation return code: OK
RTT Values:
Number Of RTT: 20 RTT Min/Avg/Max: 19/19/31
Latency one-way time:
Number of Latency one-way Samples: 0
Source to Destination Latency one way Min/Avg/Max: 0/0/0
Destination to Source Latency one way Min/Avg/Max: 0/0/0
Jitter Time:
Number of Jitter Samples: 19
Source to Destination Jitter Min/Avg/Max: 0/0/0
Destination to Source Jitter Min/Avg/Max: 1/1/1
Packet Late Arrival: 0
Out Of Sequence: 0
Source to Destination: 0 Destination to Source 1
In both Directions: 0
Packet Skipped: 0
Packet Loss: 0
Loss Period Length Min/Max: 0/0
Number of successes: 3
Number of failures: 0
Operation time to live: Forever
The routers' times are not set with NTP. They are set manually, the remote site was about a few minutes off (compared to the primary router). I've manually set it to within 1 second time now. But that didn't fix the issue.
Any other settings that could affect this?
Thanks again for the help!
James
12-14-2010 02:51 PM
These versions look like boot loader code vs. system IOS. Please post show versions from both routers.
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