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
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