Shulou(Shulou.com)06/01 Report--

1. Queue parsing

2. First In First Out (FIFO)

Interfaces with a bandwidth greater than 2.048m are running FIFO queues by default.

Interfaces with less than 2.048m interface bandwidth are running WFQ queues by default.

3. Priority Queuing (PQ)

Classification: PQ queues can be divided into four queues: High, Medium, Normal and Low. The default traffic is in Normal queues.

Queuing: the default cache size of each queue is 20,40,60 and 80 respectively, using tail discarding method.

Scheduling: only when the higher-level traffic is sent, the lower-level traffic will be sent.

4. Custom Queuing (CQ)

Classification: CQ queues can be divided into 16.1 (system queues) queues.

Queuing: the default cache size of each queue is 20, using tail discarding method.

Scheduling: polling each queue, defaulting to each queue bed 1500Bytes.

5. Weighted Fair Queuing (WFQ)

Classification: WFQ is based on flow classification and is completed automatically without intervention. By default, it can be divided into 256 categories.

The so-called flow classification, Src_Addr, Dest_Addr, Protocol, Tos, Src_Port, Dest_ Port six items need to be completely consistent.

Add team: macro-control cache, not based on queue. Lower limit of CDT cache, upper limit of HQO cache.

When the total cache packet has reached CDT, if there is another packet with the longest queue, the packet is discarded; if it is a packet that is not the longest queue, the packet will be queued.

When the total cache packet arrives at HQO, if there is another packet with the longest queue, the packet is discarded; if it is not the packet with the longest queue, the last packet in the longest queue is discarded and the newly arrived packet is queued.

Scheduling: according to the formula of completion time: Finish Time=Real Packet Size / (IP Precedence + 1), priority scheduling is given to queues with small Finish Time.

Interface configuration mode: fair-queue starts WFQ

Interface configuration mode: hold-queue 2000 out modifies HQO

Interface configuration mode: fair-queue 64256 064 represents the value of CDT, 256 represents the number of queues in WFQ, and 0 represents the number of queues in RSVP

6. Low Latency Queuing (LLQ)

7. Class-Based Weighted Fair Queuing (CBWFQ)

CBWFQ: module-based weighted fair queue (there are 64 class, 64 can be divided, all remaining traffic is classified into Class 1, for the default class, you can also do WFQ) set bandwidth for each class, polling

Class-map match-all VOIP

Match ip rtp 16384 16383

Policy-map CBWFQ

Class VOIP

Bandwidth percent 50

Class class-default

Bandwidth percent 30

Interface Serial0/0

Max-reserved-bandwidth 100

Service-policy output CBWFQ

8. Class-Based Low Latency Queuing (CBLLQ)

CBLLQ module-based low-latency queues: low latency, regulatory, equivalent to PQ in every category of CBWFQ

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