At 7:11 AM -0400 5/14/02, dovelet wrote: >Hi all, > >Our company's data network just implement xot (x.25 over TCP) to connect >several x.25 devices through a Cisco 2600 routers. Everything is fine. >However, we found that when a x.25 device make several x.25 connections (say >5) to the other x.25 device, the routers' CPU loading was increased to 80% - >90% even the connections were just used to typing command lines (i.e. not >file transfer). The response of the routers become slow. The interface >input/output rate was very low, under 20kbit/s so I think it is not due to >the x.25 traffic. Does anyone know the reason? > >x.25 device ---[serial]--- R1 ==== Ethernet ====== R2 ---[serial] ---x.25 >device > >Regards, >Dovelet
This is normal behavior. The overhead of X.25 goes up sharply with the number of virtual circuits per physical link. Remember that the router has to maintain level 2 and level 3 keepalives, transmitted and received sequence numbers, etc., for every VC. TCP does the same sort of thing. This is old data, but a 4000 router could handle a maximum of 10 VCs at 64 Kbps before the CPU was saturated. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=44213&t=44199 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
