We have one Cisco Router 6506. When I ping the local interface of the router, it responds always within 1ms. But every 2 minutes, the Router latency is at ~800ms for nearly one second. This repeats every 2 minutes.
We have no paket loss. Problem is, this effects also VoIP, which will be delayed, too.
What could be the reason for this periodically delays?
This is not how network latency is usually defined. What matters is the delay that packets passing through the router are subjected to. This test is not measuring that delay.
The 6500 (in general) forwards traffic in /hardware/ and the CPU is used for management tasks only. When you ping the router you are pinging the CPU. This is not necessarily a problem. The delay of 200ms or so is however quit large and I would want to try to get some idea of what was going on. We see delays of a few 10s of ms when we ping our 4500s (SE 4, 5).
This is /no indication whatsoever/ that you voice traffic is at risk.
"What is the reason?" This could be hard to figure out. Start by checking router CPU.
If pings thru the switch are delayed every 2 minutes then something is amiss.
If you are not the network administrator then it is going to be hard to help you as responders would need some output from the router in question in order to be able to assist. Perhaps you can get you netadmin to post required info
"Patrick Cervicek" wrote in message news:e47kn6$4q$ snipped-for-privacy@news.BelWue.DE...
As it was told before, it'd be hard to troubleshoot since you are not Network Admin. I would recommend to connect to the Console on the switch, and see if you see any messages at the time when you have your switch delays. Somehting MUST be in the log - errors, warnings, activity reported, etc. It could be your starting point.
Today I informed the network admin. He will handle this problem and contact this group within the next days. As far as we saw, there were nothing exceptional in the logs. Do we need a certain debug-/log-flag set?
Pings to other vlans (Esslingen,same location) are not affected - but one. We have a BSD-VPN-Router connected to this interface/vlan, which is connected to an other router (B) at an other location. All Hosts after B are delayed after 2 minutes for one second