I am wrestling with a T3 circuit performance issue. The service provider is measuring 13Mbps btwn their router and mine. I have a Cisco 3725 router on my end. Does anybody have any ideas why we are not seeing closer to the 45Mbps capacity of that circuit?
Below is a partial config:
controller T3 1/0
clock source line
ip address 10.10.10.2 255.255.255.252
ip access-group 101 in
no ip redirects
no ip unreachables
dsu bandwidth 44210
ACL 101 does antispoofing and denies telnet and echo.
How exactly are you testing? Is CEF enabled? What is the CPU usage of the 3725 during the test? A 3725 using CEF can handle a full T3 easily without ACLs, but should be able to do so with ACLs as well, so it's probably not a router performance issue. Are there any incrementing errrors on the serial interface (show int s1/0) while the test is running?
You may want to look over RFC1323, which deals with TCP performance issues over WAN links: http://www.faqs.org/rfcs/rfc1323.html. Depending on how "long" the link is between you and your ISP, the latency could be such that TCP extensions like window scaling are needed to max out the circuit with a single flow.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...