Port Rate Limiting; Traffic Redirecting; Vlan Marking; Queue Scheduling - H3C S3100 Series Operation Manual

H3c s3100 series ethernet switches operation manual

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Port Rate Limiting

Port rate limiting refers to limiting the total rate of inbound or outbound packets on a port.

Port rate limiting can be implemented through token buckets. That is, if you perform port rate limiting

configuration for a port, the token bucket determines the way to process the packets to be sent by this

port or packets reaching the port. Packets can be sent or received if there are enough tokens in the

token bucket; otherwise, they will be dropped.

Compared to traffic policing, port rate limiting applies to all the packets passing a port. It is a simpler

solution if you want to limit the rate of all the packets passing a port.

Traffic redirecting identifies traffic using ACLs and redirects the matched packets to specific ports. By

traffic redirecting, you can change the way in which a packet is forwarded to achieve specific purposes.

VLAN marking allows you to replace the VLAN ID carried in the traffic matching a certain ACL rule with

a new VLAN ID.

When the network is congested, the problem that many packets compete for resources must be solved,

usually through queue scheduling.

In the following section, strict priority (SP) queues, weighted round robin (WRR), and HQ-WRR (High

Queue-WRR) queues are introduced.

Figure 1-7 Diagram for SP queuing

SP queue-scheduling algorithm is specially designed for critical service applications. An important

feature of critical services is that they demand preferential service in congestion in order to reduce the

response delay. Assume that there are four output queues on the port and the preferential queue

classifies the four output queues on the port into four classes, which are queue 3, queue 2, queue 1,

and queue 0. Their priorities decrease in order.

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