First - I believe that ICMP replies are a low priority, so they may not be an accurate representation of latency. Second - Latency is primarily a product of distance. In theory, if the line distance is the same, latency should be at least relatively close given a direct line vs. frame. Of course, frame will have some overhead as it tends to traverse more devices. Check with the carrier and verify the line config... is it ESF/B8Zs or SF/AMI? Who is providing the clocking? Are the DS0's 64k or 56k? Verify the settings on the CSU/DSUs on each side. I have seen a similar problem where the line was relatively short, carrier provided no clocking, and the line was set for SF/AMI. The router was using internal T1 WICs with them set to SF/AMI. Simple pings would work fine, but any type of load would cause excessive CRC errors. Changing the T1 clocking to a internal on one side didn't seem to fix it. After some thinking... basically SF/AMI uses 7 bits, and ESF/B8Zs uses 8 bits. This is the difference between 56k and 64k channels. Changing the DS0 on the line to 56k fixed the problem. Ed "Raul De La Garza" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > Hello everyone. > > I have a peculiar problem with one of my company's FR circuits. We have > been trying to troubleshoot this issue ever since we purchased FR to replace > point-to-point HDLC. This circuit has a 256K CIR and 512K port speed. > Bandwidth utilization is low and never approaches the CIR. The remote > router's CPU and memory utilization are also very low. At present, only > weighted fair queueing is enabled. We have tried priority queueing and > traffic shaping to no avail. User response times are extremely high ranging > anywhere between 80ms to over 2000ms! > > Also, we are routing IP (no ip routing protocol, I have set a default route > back to corporate as this remote office is one of a few spokes in our > hub-and-spoke topology) and we are routing IPX using EIGRP. > > The central site FR router is a 3640 with two T1 WICs with integrated DSUs. > The remote site router is a 2501 connected to an ADC Kentrox DataSMART 658 > T1 DSU. > > Our FR vendor claims that his tests running from DCE to DCE receive a > consistent response time of 70ms. However, the vendor has noted that when > ICMP messages are sent to the remote router some are responded to very > quickly but most do take an unusually great amount of time in responding. > This the vendor found when placing a sniffer on the local loop. > > So it seems that there may be a config issue or a hardware issue at our > remote site. Any words of wisdom you can provide would be greatly > appreciated. > > Following are the configs for the remote router and the central router. > > ************REMOTE**************** > > Clrwtr_Frame#sh run > Building configuration... > > Current configuration: > ! > ! Last configuration change at 14:09:24 UTC Tue Aug 7 2001 > ! NVRAM config last updated at 14:28:59 UTC Tue Aug 7 2001 > ! > version 12.0 > service timestamps debug uptime > service timestamps log uptime > service password-encryption > ! > hostname Clrwtr_Frame > ! > boot system flash 1:aaa0862.bin > logging monitor informational > enable secret 5 > ! > ip subnet-zero > no ip finger > no ip domain-lookup > ipx routing 00d0.58ad.759a > ipx gns-round-robin > ! > ! > ! > interface Ethernet0 > ip address 10.48.2.1 255.255.255.0 > no ip directed-broadcast > no ip route-cache > no ip mroute-cache > ipx input-sap-filter 1005 > ipx encapsulation SAP > ipx network C0480021 > ! > interface Serial0 > no ip address > no ip directed-broadcast > encapsulation frame-relay > no ip route-cache > no ip mroute-cache > ! > interface Serial0.1 point-to-point > bandwidth 256 > ip address 10.201.0.73 255.255.255.252 > no ip directed-broadcast > no ip route-cache > no ip mroute-cache > ipx network C2010073 > frame-relay interface-dlci 17 > ! > interface Serial1 > no ip address > no ip directed-broadcast > no ip route-cache > no ip mroute-cache > shutdown > ! > interface Dialer0 > no ip address > no ip directed-broadcast > no ip route-cache > no ip mroute-cache > ! > ip classless > ip route 0.0.0.0 0.0.0.0 10.201.0.74 > ! > access-list 99 permit 10.1.4.200 > access-list 1005 deny C0480021 3 > access-list 1005 deny C0480021 7 > access-list 1005 deny C0480021 47 > access-list 1005 permit FFFFFFFF > priority-list 1 protocol ip high tcp 5900 > priority-list 1 protocol ipx low > priority-list 1 protocol ip medium tcp 1352 > priority-list 1 protocol ip high tcp telnet > priority-list 1 protocol ip medium udp 1352 > priority-list 1 protocol ip normal > priority-list 1 protocol ip high tcp 12000 > priority-list 1 protocol ip high tcp 13000 > priority-list 1 protocol ip high tcp 1494 > priority-list 1 default low > ! > ! > ipx router eigrp 18 > network all > ! > ! > ! > snmp-server community tup2go RO > snmp-server community redpings RW 99 > snmp-server community public RO > banner exec ^C > *************************************************** > * * > * Welcome to Clrwtr_Frame! * > * * > * For assistance, call Cisco TAC * > * or contact xxxxxx's MIS Network Staff * > * * > * IS Manager: xxxxxx xxxxxxx xxx.xxx.xxxx * > * Sen. Eng: xxxx xx xx xxxxx xxx.xxx.xxxx * > * * > *************************************************** > ^C > banner motd ^C > Property of Emcare Incorporated > > All violaters will be prosecuted to the full extant of the law. > > ^C > ! > line con 0 > exec-timeout 0 0 > password 7 > login > transport input none > line aux 0 > exec-timeout 3 0 > password 7 > login > modem InOut > transport input all > stopbits 1 > speed 38400 > flowcontrol hardware > line vty 0 4 > password 7 > login > ! > ntp clock-period 17180034 > ntp server 10.1.1.2 > end > > **************CENTRAL********************* > > Dallas_3640#sh run > Building configuration... > > Current configuration: > ! > ! Last configuration change at 17:38:47 UTC Thu Aug 2 2001 > ! NVRAM config last updated at 16:51:37 UTC Thu Aug 2 2001 > ! > version 12.0 > service timestamps debug uptime > service timestamps log uptime > service password-encryption > ! > hostname Dallas_3640 > ! > boot system flash 1:c3640-d-mz.120-7.bin > no logging console > logging monitor errors > enable secret 5 > ! > ! > ! > ! > ! > ip subnet-zero > no ip domain-lookup > ! > ipx routing 0002.1630.7501 > ipx gns-round-robin > ! > ! > ! > interface Ethernet0/0 > description Connected to Dallas Ethernet > ip address 10.1.1.2 255.255.0.0 > no ip directed-broadcast > ipx input-sap-filter 1005 > ipx encapsulation SAP > ipx network 2 > ! > interface Serial0/0 > description T1 DATA1 > no ip address > no ip directed-broadcast > encapsulation frame-relay > no ip mroute-cache > no fair-queue > service-module t1 remote-alarm-enable > frame-relay traffic-shaping > frame-relay qos-autosense > ! > interface Serial0/0.1 point-to-point > description Connected to Clearwater > bandwidth 256 > ip address 10.201.0.74 255.255.255.252 > no ip directed-broadcast > ipx network C2010073 > frame-relay interface-dlci 22 > ! > interface Serial0/0.3 point-to-point > description Connected to Santa Barbara > bandwidth 128 > ip address 10.201.0.78 255.255.255.252 > no ip directed-broadcast > ipx network C2010077 > frame-relay class clearwater > frame-relay interface-dlci 20 > ! > interface Serial0/0.5 point-to-point > description Connected to St. Louis (Woodfield) > bandwidth 256 > ip address 10.201.0.66 255.255.255.252 > no ip directed-broadcast > frame-relay class stlouis > frame-relay interface-dlci 23 > ! > interface Serial0/1 > description T1 DATA2 > no ip address > no ip directed-broadcast > encapsulation frame-relay > no fair-queue > service-module t1 remote-alarm-enable > frame-relay traffic-shaping > frame-relay lmi-type cisco > frame-relay qos-autosense > ! > interface Serial0/1.1 point-to-point > description Connected to Atlanta > bandwidth 256 > ip address 10.201.0.34 255.255.255.252 > no ip directed-broadcast > ipx network C2010033 > frame-relay class stlouis > frame-relay interface-dlci 28 > ! > interface Serial0/1.2 point-to-point > description Connected to Elmhurst > bandwidth 256 > ip address 10.201.0.30 255.255.255.252 > no ip directed-broadcast > ipx network A0000121 > frame-relay class stlouis > frame-relay interface-dlci 19 > ! > interface Serial0/1.3 point-to-point > description Connected to Horsham > bandwidth 256 > ip address 10.201.0.26 255.255.255.252 > no ip directed-broadcast > ipx network C2010025 > frame-relay class stlouis > frame-relay interface-dlci 25 > ! > interface Serial0/1.4 point-to-point > description Connected to San Jose > bandwidth 128 > ip address 10.201.0.90 255.255.255.252 > no ip directed-broadcast > ipx network C2010089 > frame-relay class clearwater > frame-relay interface-dlci 30 > ! > interface Serial0/1.5 point-to-point > description Connected to (Spartanburg) > bandwidth 128 > ip address 10.201.0.86 255.255.255.252 > no ip directed-broadcast > ipx network C2010085 > frame-relay class clearwater > frame-relay interface-dlci 29 > ! > router eigrp 18 > redistribute static > network 10.1.0.0 0.0.255.255 > network 10.0.0.0 > ! > ip classless > ip route 0.0.0.0 0.0.0.0 10.1.1.24 > ip route 10.11.0.0 255.255.0.0 Serial0/1.3 > ip route 10.48.0.0 255.255.255.0 10.25.0.14 > ip route 10.48.2.0 255.255.255.0 10.201.0.73 > ip route 10.48.4.0 255.255.255.0 Serial0/0.3 > ip route 10.50.1.0 255.255.255.0 Serial0/1.1 > ip route 10.202.35.0 255.255.255.0 Serial0/0.5 > ip route 10.202.36.0 255.255.255.0 Serial0/1.2 > ip route 10.202.40.0 255.255.255.0 10.1.1.38 > ip route 10.202.42.0 255.255.255.0 10.1.1.38 > ip route 10.202.43.0 255.255.255.0 Serial0/1.4 > ip route 185.245.0.0 255.255.0.0 10.1.1.1 > no ip http server > ! > ! > map-class frame-relay clearwater > frame-relay traffic-rate 128000 256000 > no frame-relay adaptive-shaping > ! > map-class frame-relay stlouis > frame-relay traffic-rate 256000 512000 > no frame-relay adaptive-shaping > ! > map-class frame-relay clrwtr-becn > frame-relay adaptive-shaping becn > access-list 1005 deny 2 3 > access-list 1005 deny 2 7 > access-list 1005 deny 2 47 > access-list 1005 permit FFFFFFFF > priority-list 1 default low > ! > ! > ipx router eigrp 18 > network all > ! > ! > ipx router rip > no network C2010025 > no network C2010073 > no network C2010033 > no network C2010089 > no network C2010077 > no network A0000121 > ! > ! > ! > snmp-server engineID local 000000090200000216307511 > snmp-server community tup2go RO > snmp-server community redpings RW 99 > snmp-server community public RO > snmp-server enable traps snmp > snmp-server enable traps config > snmp-server enable traps syslog > snmp-server enable traps frame-relay > snmp-server enable traps rtr > banner exec ^C > > *************************************************** > * * > * Welcome to Dallas_3640! * > * * > * For assistance, call Cisco TAC * > * or contact xxxxxxxx MIS Network Staff * > * * > * IS Manager: xxxxxx xxxxxxx xxx.xxx.xxxx * > * Sen. Eng: xxxx xx xx xxxxx xxx.xxx.xxxx * > * * > *************************************************** > ^C > banner motd ^C > > > > > > > > > > > WARNING! > > Use of this network is restricted to authorized users. User activity is > monitore > d and recorded ^C > ! > line con 0 > exec-timeout 0 0 > password 7 > login > transport input none > line aux 0 > password 7 > login > modem Dialin > line vty 0 4 > password 7 > login > ! > ntp clock-period 17180195 > ntp server 10.1.1.33 > end > > Thank you, > > Raul De La Garza > CCDP NNCSS MCSE CNE > > > _________________________________________________________________ > Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=15175&t=15146 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
