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| Chapter 12 Port Rate Limit and Storm Control | |
| Table 23 Rate Limit Configuration (continued) | ||
| LABEL | DESCRIPTION |
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| Tokens | The switch uses a “Token Bucket” algorithm to limit the outgoing rate on the ports and |
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| Added Per | to limit the largest amount of packets that can leave the port in any one instance. |
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| Interval | In this algorithm each “token” represents an allowed amount of bandwidth to be sent |
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| out on the port. |
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| The “bucket” holds the tokens. In other words, the number of tokens in the bucket |
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| represents the maximum allowed bandwidth to go out on the port. The size of the |
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| bucket is specified by the “burst size” (see below). |
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| Every time traffic goes out on the port, tokens (representing used up bandwidth) are |
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| removed from the bucket, thus limiting the amount of traffic allowed to go out on the |
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| port. Tokens are also added to the bucket every Token Update Interval, thus |
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| resetting the amount of bandwidth allowed to go out. If the bucket is empty, the data |
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| packets are dropped until more tokens are added to the bucket. |
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| Select the number of tokens that should be added to the bucket per Token Update |
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| Interval. Each token represents .5 bit in bandwidth allowed to go out on the port. |
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| Burst Size | The burst size specifies the maximum amount of traffic that can be allowed out the port |
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| at any one instance. In the “Token Bucket” algorithm this is referred to as the size of |
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| the bucket as this value limits the number of tokens that can accumulate in the bucket. |
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| Apply | Click this to save your changes to the switch. |
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12.1.2 Broadcast Storm Control Setup
Broadcast storm control limits the number of broadcast, multicast and unknown unicast (also referred to as Destination Lookup Failure or DLF) packets the switch receives per second on the ports. When the maximum number of allowable broadcast, multicast and unknown unicast packets is reached per second, the subsequent packets are discarded. Enable this feature to reduce broadcast, multicast and unknown unicast packets in your network.
Click Rate > Storm Control in the navigation panel to display the screen as shown next.
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