WRED and QoS provisioning in ISP network

[Joe Shen]

 Hi,

We are evaluting whether we should implement DiffServ
Based e2e QoS provisioning in our network. Someone
recommend that WRED should be used on each node which
is setup to send traffic according to
DSCP/IP_precedence. They disclame that DiffServ+WRED
is the best solution for current network. But, as I
know WRED will bias normal TCP flows, while UDP and
greedy TCP flows(like BT download) will win in
Bandwidth competition.

Is there anybody could do some help on telling me:

1. Is there any ISP use WRED in there network and gain
much from it? How do they use it ?

2. Is there any information available on how ISP plan
their network according DiffServ architecture?

3. Is there any tool to monitor bandwidth utilization
of each QoS class on each node ? Is there any tool to
monitor e2e QoS performance of each QoS class?

4. How does they plan trunk capacity in a dynamic
network environment? esp. in DiffServ network

5. Is there any possible security problem in a QoS
enabled network?

6. How could we optimize network architecutre
according to QoS policy? 

Each word will be highly appreciated.

Joe Shen

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