Hi all.At one of our offices connected to our central location over a metroethernet LAN we have a Cisco 4500.
Recently we have started experiencing weird slowing downs of network for a few moments.I believe that the problem is in the metroethernet link and I have setup SAA monitoring to see if really there is something wrong with the link because I can't see any dropped packets or flushes on the 4500 interfaces and neither is the CPU utilization high(it sometimes jumps to around 85 percent for a few seconds but that seems OK),there are no routing loops and ping over the link when I test seems OK.But as the problem is contained only in this part of the network I think the problem is the link.
Can anyone think of another reason why there are these weird slowing downs besides the link as they can really frustrating.
If the link's hand-off is 100 Mbps and it provides 100 Mbps end-to-end, there shouldn't be any unusual problems beyond any other link. This also assumes that it isn't a multipoint link and the provider isn't having any internal issues.
You now mention a possible slow down of Internet access, so perhaps the prior reported network issue wasn't precise enough beyond the often common user complaint "the network is (occasional) slow". You may need to continue to analyze performance in addition to requesting users to be a precise as possible of what they see as slow and when they see it. Besides your SAA monitoring, you might also trying sniffing the traffic flow across this link looking for other errors, e.g. high TCP retransmits, etc.