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How to provide delay? with WRED ?

kruas-san
Level 1
Level 1

Hello!

I have 4 flows sent with a constant rate 100 pkts per second. The packet size in each flow is 1400 bytes.

After passing WRED each flow gets some packet loss and delay variation.

My question: In WRED The queue size for each flow must oscilate (it is not constant) But on tje output of the router cisco 7206 I get the constant RTT for each flow.

How can it be?

IN the attachments are the LOSS&RTT graphs for the flows

Router configuration:

policy-map gold

class af11

bandwidth percent 60

random-detect dscp-based

random-detect dscp 10 32 40 10

class af12

bandwidth percent 10

random-detect dscp-based

random-detect dscp 12 28 40 10

class af13

bandwidth percent 10

random-detect dscp-based

random-detect dscp 14 24 40 10

class class-default

bandwidth percent 10

random-detect dscp-based

random-detect dscp 0 20 40 10

.................

!

interface ATM2/0.34 point-to-point

description RBNet

bandwidth 2000

ip address 10.0.4.1 255.255.255.252

pvc rbnet 15/64

ubr 2000

tx-ring-limit 3

encapsulation aal5mux ip

service-policy output gold

!

1 Reply 1

kruas-san
Level 1
Level 1

Here is RTT graphs.

Please tell me why RTT doesn't change with the change of queue length(in WRED)?