3Com 3036, Руководство по настройке

Страница: 272 / 762

268 C
HAPTER
17: C
ONFIGURING
F
RAME
R
ELAY
By default, the queue type of a Frame Relay PVC is FIFO.
When the congestion management is enabled on Frame Relay PVCs, the queue
type on the interface can only be FIFO.
For the configuration of PQ, CQ and WFQ, refer to the part of QoS .
2 Configure Frame Relay Interface Queueing
The user can configure four queueing types on a Frame Relay interface:.FIFO, PQ,
CQ and WFQ. All of them are the queues owned by a general QoS. For their
configurations, refer to the part of
QoS .
Frame Relay interface also supports PVC interface priority queueing (PIPQ). This
queueing type can only be applied on a Frame Relay interface. After Frame Relay
traffic shaping or Frame Relay congestion management is enabled on a Frame
Relay interface, the queueing type on the interface can only be either FIFO or PIPQ.
A PIPQ queue classifies the packets into four categories according to different
Frame Relay PVCs.
A PIPQ queue has four sub-queues. They are respectively high-priority queue ( top ),
medium-priority queue ( middle ), normal-priority queue ( normal ) and low-priority
queue ( bottom ). The priorities are listed in descending order. The packets will be
transmitted according to the priority sequence. Specifically, all the packets in the
top queue will be first transmitted, then the packets in the middle queue
followed by the packets in the normal queue, and finally those in the bottom
queue. Each Frame Relay PVC on the interface has its own PIPQ priority. Therefore,
the packets from this PVC can only enter the corresponding PIPQ queue.
Perform the following configurations respectively in interface view and frame relay
class view.
Table 310 Configure PIPQ
By default, the queueing type of a Frame Relay interface is FIFO.
Set the queue type of a Frame Relay PVC to CQ
cq cql list-number
Restore the queue type of a Frame Relay PVC to
FIFO
undo cq cql
Set the queue type of a Frame Relay PVC to
WFQ
wfq [
congestive-discard-threshold [
dynamic-queues ] ]
Restore the queue type of a Frame Relay PVC to
FIFO
undo wfq
Operation Command
Set the queueing type of Frame Relay interface to
PIPQ and set the length of each PIPQ queue at
the same time (in interface view)
fr pvc-pq [ top-limit
middle-limit normal-limit
bottom-limit ]
Restore the queueing type of Frame Relay
interface to FIFO (in interface view)
undo fr pvc-pq
Set the priority of PIPQ on the Frame Relay PVC
(in frame relay class view)
pvc-pq { top | middle | normal
| bottom }
Restore the priority of PIPQ on the Frame Relay
PVC to
normal (in frame relay class view)
undo pvc-pq