From: Larry Roberts (groupstudy@american-hero.com)
Date: Wed Mar 02 2005 - 17:52:26 GMT-3
Ok folks I need some collective brain power.
Recently I started noticing issues surfing to certain websites during
the day.
After sticking a sniffer on the network I noticed an excessive number of
retransmissions happening. I dug a little deeper and noticed that it
didn't matter what the protocol was ( www,ssl,3389...etc) I was getting
these retransmissions, and it didn't matter how close the systems were.
Only thing that mattered was time of day ( Aha!..sorta ) During business
hours it was much more pronounced but it was also happening after hours
as well.
I can go and sit on my DC VLAN, plugged directly into my 6509 and
connect to an apache box also on the DC subnet and still get them.
I setup spanning and noticed that EVERYONE is seeing them.
With traffic internal experiencing it I can rule out the FW or the
Internet circuit. I believe the issue is related to the 6509 and its
configuration.
I'm looking for a little guidance on how to best troubleshoot this
traffic. Other than seeing excessive retran's I don't get any data from
the sniffer, and the 6509 shows its utilization at 3% over 5 min.
The 6509 has 2 SupII/MSFC2's as well as 2 8 port GBIC's that connect to
3 3508's on 3 separate floors. Each 3508 has 2 uplinks to the 6509, and
6 3550's connected to the other GBIC's.
Traffic utilization is minimal on the Fiber and I show no input/output
errors on them.
I'm running c6sup22-dsv-mz.121-22.E1 on the 6509.
I have IPX bridged across every VLAN ( Not by choice ) as well 5
separate VLAN's.
Any thoughts on how to best go about troubleshooting this issue?
Nothing has changed recently that I am aware of on the network, but
about a month ago the problem appeared.
-- Thanks,Larry
This archive was generated by hypermail 2.1.4 : Sun Apr 03 2005 - 17:56:39 GMT-3