[j-nsp] A conceptual advice on QoS is needed

[Victor Sudakov]

Colleagues,

We have Juniper switches interconnected by a transport network (NEC
equipment mostly). The nodes of the transport network are Ethernet
switches in their own right, they have 4 or 8 interface queues and can
do priority queueing and/or WRR queueing based on 802.1p codepoints in
received frames.

Now if you had to implement QoS policies, where would you do the
actual prioritization:

1. Classify the frames on the Juniper switches, but do the actual
queueing/prioritization in the transport network.

2. Configure one FIFO queue on the transport network nodes and do both
classification and prioritization on the switches.

It may be important to know that most switches are connected to the
transport network by Gigabit interfaces, but the real throughtput of
the transport network itself is about 150 Mbit/s. 

But there is another branch of the transport network where all
interfaces on the nodes are 100BaseT, so the switches are connected at
100 Mbit/s.

Thanks in advance for any opinions. 

-- 
Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
sip:sudakov at sibptus.tomsk.ru