Traffic Policing; Queuing - HP A6600 Configuration Manual

Traffic policing

FR traffic policing monitors the traffic entering the network from each PVC, and restricts the traffic within a
permitted range. If the traffic on a PVC exceeds the user-defined threshold, the router takes some measures,
like packet drop, to protect the network resources.
Figure 42 FR traffic policing implementation
192Kbps
S2/0
DTE
Router A
CIR ALLOW=64Kbps
As shown in Figure
side. However, Router B only wants to provide the bandwidth of 64 kbps for Router A. You must configure FR
traffic policing at the DCE side of Router B.
FR traffic policing can only be applied to the DCE interface of a router. FR traffic policing can monitor the
traffic transmitted from the DTE side. When the traffic is smaller than CBS, the packets can be transmitted,
and the router does not process the packets. When the traffic is larger than CBS and smaller than EBS + CBS,
the packets can be transmitted. However, as for those packets of the traffic exceeding CBS, the router sets the
DE flag bits in the FR packet headers to 1. When the traffic is larger than CBS + EBS, the router transmits the
traffic of CBS + EBS and drops the traffic exceeding CBS + EBS. Regarding the traffic exceeding CBS, the
router sets the DE flag bits in the FR packet headers to 1.

Queuing

Besides FR PVC queues, FR interfaces also have interface queues. With FRTS disabled, only FR interface
queues take effect, and the predefined FR PVC queues take effect only in the case that FRTS is enabled.
The relationship between PVC queues and interface queues is shown in
Figure 43 FR queuing
The following queuing mechanisms are available on FR interfaces:
FIFO

PQ

CQ

64Kbps
S2/0
DCE NNI
Router B
CBS=8000bit
EBS=8000bit
42, Router A at the user side transmits packets at 192 kbps to Router B at the switching
PVC queue
Frame relay
network
Interface queue
124
Figure 43.