Adam Vitkovsky wrote: > > > > 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, > > If your network carries traffic of higher priority that is interleaved with > traffic of lower priority then the below questions are relevant: > > 1) Can it happen on Juniper switches that BW on input > BW on output > (e.g. traffic incoming on multiple ports will be transmitted out one > port)?
Very unlikely. > > 2) Can it happen on NEC transport switches that BW on input > BW on output? Most likely. > If yes then you need QOS (classification and scheduling) The question is, where I need QoS: before the traffic enters the transport switches or inside them. -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN sip:[email protected] _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
