Dear All, I have two Cisco 7206 with IOS 12.2(11)T and connnected them directly through ATM-PA3 Server --- router1--- (ATM PVC)--- router 2 ---- Client
ATM PVC will be the bottleneck of the netwok as Server/Client are connected to routers through FE. Before I configured Per-VC WRED, the FTP download throughput can achieve about 120kbps. Once I apply the WRED on router1, the FTP throughput drop sharply and only have about 50kbps. As I checked that the queueing on ATM interface is WRED and there is a lot of packet drop. However, the packet drop also found if no WRED was configured (ie, the queueing in ATM is FIFO) but it will have 120kbps. My question is that why WRED will suffer the performance drop? Or WRED not configured well? Below is router configuration: ! ! random-detect-group testing precedence 0 200 1000 10 precedence 1 300 1000 10 precedence 2 400 1000 10 precedence 3 500 1000 10 precedence 4 600 1000 10 precedence 5 700 1000 10 precedence 6 800 1000 10 precedence 7 900 1000 10 ip subnet-zero ip cef ! ! ! interface FastEthernet0/0 ip address 10.0.0.1 255.255.255.0 duplex full ! interface ATM1/0 no ip address no atm ilmi-keepalive ! interface ATM1/0.100 point-to-point ip address 30.0.0.1 255.255.255.0 pvc 1/100 random-detect attach testing vbr-nrt 256 256 10 encapsulation aal5snap ! ! interface FastEthernet2/0 ip address 20.0.0.1 255.255.255.0 duplex full ! ip classless router1#sh queueing interface atM 1/0 Interface ATM1/0 VC 1/100 Queueing strategy: random early detection (WRED) Exp-weight-constant: 9 (1/512) Mean queue depth: 200 Total output drops per VC: 248 class Random drop Tail drop Minimum Maximum Mark pkts/bytes pkts/bytes thresh thresh prob 0 248/33818 0/0 200 1000 1/10 1 0/0 0/0 300 1000 1/10 2 0/0 0/0 400 1000 1/10 3 0/0 0/0 500 1000 1/10 4 0/0 0/0 600 1000 1/10 5 0/0 0/0 700 1000 1/10 6 0/0 0/0 800 1000 1/10 7 0/0 0/0 900 1000 1/10 rsvp 0/0 0/0 36 40 1/10 router1#sh queueing interface atM 1/0 Interface ATM1/0 VC 1/100 Queueing strategy: random early detection (WRED) Exp-weight-constant: 9 (1/512) Mean queue depth: 204 Total output drops per VC: 403 class Random drop Tail drop Minimum Maximum Mark pkts/bytes pkts/bytes thresh thresh prob 0 403/54796 0/0 200 1000 1/10 1 0/0 0/0 300 1000 1/10 2 0/0 0/0 400 1000 1/10 3 0/0 0/0 500 1000 1/10 4 0/0 0/0 600 1000 1/10 5 0/0 0/0 700 1000 1/10 6 0/0 0/0 800 1000 1/10 7 0/0 0/0 900 1000 1/10 rsvp 0/0 0/0 36 40 1/10 rgds, LoChing Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=58784&t=58784 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]