ZyXEL GS-1548 User Manual download pdf (Page 80)

Chapter 12 Port Rate Limit and Storm Control

GS-1524/GS-1548 User’s Guide

12.1.1 Rate Limit Screen

Click a port number in the Port Rate screen to bring up the screen as shown next.

Figure 45 Rate Limit Configuration

The following table describes the related labels in this screen.

Table 23 Rate Limit Configuration

LABEL DESCRIPTION

Ingress Rate Specify the maximum bandwidth allowed in kilobits per second (Kbps) for the incoming

traffic flow on a port.

Egress Traffic

Shaping

Select Disabled to not have any bandwidth limits for outgoing traffic on the port or

select Enabled to enable bandwidth limits for outgoing traffic on the port.

Rate This is a read only field indicating the rate limit of outgoing traffic on the port in Kbps.

This value changes depending on the number of Tokens Added Per Interval.

Tokens

Added Per

Interval

The Switch uses a “Token Bucket” algorithm to limit the outgoing rate on the ports and

to limit the largest amount of packets that can leave the port in any one instance.

In this algorithm each “token” represents an allowed amount of bandwidth to be sent

out on the port.

The “bucket” holds the tokens. In other words, the number of tokens in the bucket

represents the maximum allowed bandwidth to go out on the port. The size of the

bucket is specified by the “burst size” (see below).

Every time traffic goes out on the port, tokens (representing used up bandwidth) are

removed from the bucket, thus limiting the amount of traffic allowed to go out on the

port. Tokens are also added to the bucket every Token Update Interval, thus resetting

the amount of bandwidth allowed to go out. If the bucket is empty, the data packets are

dropped until more tokens are added to the bucket.

Select the number of tokens that should be added to the bucket per Token Update

Interval. Each token represents .5 bit in bandwidth allowed to go out on the port.

Burst Size The burst size specifies the maximum amount of traffic that can be allowed out the port

at any one instance. In the “Token Bucket” algorithm this is referred to as the size of

the bucket as this value limits the number of tokens that can accumulate in the bucket.

Apply Click this to save your changes to the Switch.

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ZyXEL GS-1548 User Manual Page 80