Re: Ping latency [7:50018]
Thanks for the replies. Priscilla I tried the ping into both of the networks in question and have recieved the same results. As an aside, is there an acceptable level of variance in the results of a ping and what are the side effects of such a large dicrepancy in the ping response times. I have run the test on other configured neworks and they all show consistent ping response times of up to 32ms, but nothing like what is happening for this one client. DW wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... I am running 2 WAN links through the same router and have been have session disconnect problems recently. I have been running several ping tests across both of the links (128K FR and 512K Leased line) and they are both showing response times fluctuating from 30ms to 1400ms (No dropped packets). I believe this is the root of the problem. What could be causing this delay through the router ??? The memory and processor usage looks to be within tolerable limits. I am also assuming this kind of delay is not normal, would I be right ?? All answers appreciated ! Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=50272t=50018 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Ping latency [7:50018]
It might be time to break out the sniffer. Have a host copy a file over the network across the link and look at the general response times it each packet takes on the acknowledements. Do a variety of tests in this manner. if you could run netperf, a freeware, across the link that'd be good. DW wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Thanks for the replies. Priscilla I tried the ping into both of the networks in question and have recieved the same results. As an aside, is there an acceptable level of variance in the results of a ping and what are the side effects of such a large dicrepancy in the ping response times. I have run the test on other configured neworks and they all show consistent ping response times of up to 32ms, but nothing like what is happening for this one client. DW wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... I am running 2 WAN links through the same router and have been have session disconnect problems recently. I have been running several ping tests across both of the links (128K FR and 512K Leased line) and they are both showing response times fluctuating from 30ms to 1400ms (No dropped packets). I believe this is the root of the problem. What could be causing this delay through the router ??? The memory and processor usage looks to be within tolerable limits. I am also assuming this kind of delay is not normal, would I be right ?? All answers appreciated ! Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=50273t=50018 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Ping latency [7:50018]
DW wrote: Thanks for the replies. Priscilla I tried the ping into both of the networks in question and have recieved the same results. As an aside, is there an acceptable level of variance in the results of a ping and what are the side I can't quote an exact number for an acceptable level of variance, but the variance you are seeing doesn't look good. Also I think you said users are complaining of disconnects. Once you have lots of user complaints, then, in general, you're past the acceptable level of variance. Have you tried Trace Route? It might indicate a routing loop problem. Once again, trace route into the network. Don't trace route to the router. (IOS rate limits ICMP TTL Exceeded messages, so you don't get a good idea of the actual delay.) What is the reliability of these two links? Is it a lot less than 255/255? Have there been a lot of CRC errors? The fact that both links are affected points to any component that they both share. Buliding wiring to the POP? Wiring to the service provider? On the Frame Relay link, are there lots of FECNS, BECNS, DEs? Are you exceeding your CIR? Have you tried some other tests besides Ping? Do you have a protocol analyzer that would let you look at some packets when you do some more advanced testing? Finally, have you involved the service provider? I think you should get them to run some tests. Priscilla effects of such a large dicrepancy in the ping response times. I have run the test on other configured neworks and they all show consistent ping response times of up to 32ms, but nothing like what is happening for this one client. DW wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... I am running 2 WAN links through the same router and have been have session disconnect problems recently. I have been running several ping tests across both of the links (128K FR and 512K Leased line) and they are both showing response times fluctuating from 30ms to 1400ms (No dropped packets). I believe this is the root of the problem. What could be causing this delay through the router ??? The memory and processor usage looks to be within tolerable limits. I am also assuming this kind of delay is not normal, would I be right ?? All answers appreciated ! Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=50283t=50018 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Ping latency [7:50018]
The devices are both 2610's. I am telnetting to one of the 2610's and pinging the serial interface / Frame Relay subinterface on the directly connected devices (Not pinging into the network). The leased line is running PPP. What is strange is that it is the same result across both links. The Min/Max/Avg times fluctuate constantly with one being as bad as 40ms/560ms/75ms. Robert D. Cluett wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... What type of device? What layer 2 protocol? PPP or HDLC? What is the source and destination of the ping? DW wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... I am running 2 WAN links through the same router and have been have session disconnect problems recently. I have been running several ping tests across both of the links (128K FR and 512K Leased line) and they are both showing response times fluctuating from 30ms to 1400ms (No dropped packets). I believe this is the root of the problem. What could be causing this delay through the router ??? The memory and processor usage looks to be within tolerable limits. I am also assuming this kind of delay is not normal, would I be right ?? All answers appreciated ! Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=50101t=50018 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Ping latency [7:50018]
Try pinging into the network. I wouldn't trust the results of pinging the router's own serial interface. Routers have more important things to do than respond to pings. I can't say for sure (better read that IOS Architecture book!), but I think the IOS responds to pings at a low priority. Try pinging a PC on the other side of the router instead. Priscilla DW wrote: The devices are both 2610's. I am telnetting to one of the 2610's and pinging the serial interface / Frame Relay subinterface on the directly connected devices (Not pinging into the network). The leased line is running PPP. What is strange is that it is the same result across both links. The Min/Max/Avg times fluctuate constantly with one being as bad as 40ms/560ms/75ms. Robert D. Cluett wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... What type of device? What layer 2 protocol? PPP or HDLC? What is the source and destination of the ping? DW wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... I am running 2 WAN links through the same router and have been have session disconnect problems recently. I have been running several ping tests across both of the links (128K FR and 512K Leased line) and they are both showing response times fluctuating from 30ms to 1400ms (No dropped packets). I believe this is the root of the problem. What could be causing this delay through the router ??? The memory and processor usage looks to be within tolerable limits. I am also assuming this kind of delay is not normal, would I be right ?? All answers appreciated ! Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=50141t=50018 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Ping latency [7:50018]
What type of device? What layer 2 protocol? PPP or HDLC? What is the source and destination of the ping? DW wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... I am running 2 WAN links through the same router and have been have session disconnect problems recently. I have been running several ping tests across both of the links (128K FR and 512K Leased line) and they are both showing response times fluctuating from 30ms to 1400ms (No dropped packets). I believe this is the root of the problem. What could be causing this delay through the router ??? The memory and processor usage looks to be within tolerable limits. I am also assuming this kind of delay is not normal, would I be right ?? All answers appreciated ! Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=50028t=50018 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Ping latency [7:50018]
Are you pinging a directly connected interface or something deeper into the network??? -Original Message- From: DW [mailto:[EMAIL PROTECTED]] Sent: Monday, July 29, 2002 11:44 AM To: [EMAIL PROTECTED] Subject: Ping latency [7:50018] I am running 2 WAN links through the same router and have been have session disconnect problems recently. I have been running several ping tests across both of the links (128K FR and 512K Leased line) and they are both showing response times fluctuating from 30ms to 1400ms (No dropped packets). I believe this is the root of the problem. What could be causing this delay through the router ??? The memory and processor usage looks to be within tolerable limits. I am also assuming this kind of delay is not normal, would I be right ?? All answers appreciated ! Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=50031t=50018 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
