04-30-2009 02:22 PM - edited 03-04-2019 04:36 AM
Hello guys,
I have a location upgraded from burstable T1 to T1 line..Users complaining slowness. I checked through cnet bandwidth meter it only shows 200-500 kpbs.
Called Verizon and they said it is configured fine on their end (they sent conf)
Here is my serial config
interface Serial0
description To Worldcom
no ip address
encapsulation frame-relay IETF
no ip mroute-cache
no fair-queue
service-module t1 timeslots 1-24
frame-relay lmi-type ansi
!
interface Serial0.1 point-to-point
bandwidth 1536
ip address x.x.x.x 255.255.255.248
ip access-group 199 in
ip nat outside
ip inspect AM-firewall out
no ip mroute-cache
no cdp enable
frame-relay interface-dlci 500 IETF
crypto map AM-region
No collisions or errors on the interface.(rebooted the router)
What you think..
Please help
05-01-2009 02:34 AM
ManjinderPal
You do not tell us what model of router this is and knowing that might be helpful. I see from your config that on this interface you are doing:
- frame relay which takes a small amount of bandwidth for overhead traffic such as LMI
- access list filtering on traffic through the interface
- ip inspect to dynamically track and control traffic through the interface
- address translation
- crypto processing (encryption) of traffic through the interface
Each of these things puts some load on the router. It is possible that the combined load is slowing things down. If your access list has some lines that include the "log" parameter that could impose additional load on the router. Perhaps it would be helpful if you would post the output of show proc cpu hist
HTH
Rick
05-01-2009 04:07 AM
Besides the issue Rick noted, you didn't note whether there are inteface drops.
As to users complaining about slowness, very common with most WAN links (especially if users are used to LAN perfomance).
As to your bandwidth meter only showing 200-500 Kbps, is that all traffic or one flow? If the latter, could be just what's available on the link when you measure.
PS:
There are many other issues to consider. One that often arises, is FIFO queuing impact to traffic when there's congestion (I see FQ is disabled). If this is an Internet connection, what's the ISP doing on their side? What's interface load look like?
05-01-2009 07:29 AM
Thanks for your time it is a 1720 router and the load is only showing 4-8% CPU usage. I used Cnet bandwidth meter like 10 time and it just shows about same bandwidth..
I have similar locations with same configuration and I see full T1 bandwidth with same tool. Please help.
05-01-2009 07:36 AM
ManjinderPal
There may be other aspects to think about that could help explain these symptoms. Is it possible that there could be something between the router and the LAN that might be a bottle neck, such as a duplex mismatch, or a faulty cable that could be corrupting packets and requiring retransmission?
In other locations that are seeing full T1 bandwidth are they also 1720 routers?
HTH
Rick
05-01-2009 10:29 AM
My other locations are 2600 and 1800 series routers.
I changed the duplex settings for switch no collisions or drops..If it is faulty cable I will see some errors??
05-04-2009 09:15 PM
Please note that the CNET bandwidth test is run from a PC to a server at a location within CNET's network. There are many factors that would effect the reported bandwidth other than your T1.
What is the controller configuration and please provide the result of show interface S0, show F/R PVC, etc.
05-04-2009 11:35 PM
as previously mentioned by others rather than using bandwidth meters better you can ask some ftp access form your upstream provider and monitor the bandwidth. Because you ISP should provide the guarantee.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide