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Configuring Switching
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SonicOS 5.7: Advanced Switching Feature Guide and Screencast Tutorial
The Switching > Rate Control page, shown in Figure 19, provides information and configuration for
per-interface rate limiting and flow control. Both the rate limiting and flow control features are configured
on a per port basis.
Figure 19 Switching > Rate Control Page
Egress Traffic Rate Limiting
In SonicOS, the rate limiting for egress frames can only be enabled or disabled, no mode can be selected.
Ingress Traffic Rate Limiting
In SonicOS, the bandwidth of ingress frames can be rate-limited in four modes:
• Limit All Frames – Apply rate limiting to all types of network traffic arriving on the interface
• Limit just broadcast, multicast and flooded unicast frames – Apply rate limiting to broadcast, multicast
and flooded unicast traffic arriving on the interface, where:
–
Broadcast traffic is traffic that is simultaneously sent to all computers in the network, typically to
announce shared services and state information.
–
Multicast traffic is traffic that is simultaneously sent to a group of computers in the network.
Specific multicast addresses are used for different purposes. For example, Spanning Tree Protocol
802.1D for bridges uses the well-known multicast address 01-80-C2-00-00-00, and Spanning Tree
Protocol 802.1AD for provider bridges uses the well-known multicast address 01-80-C2-00-00-08.
–
Flooded unicast traffic is traffic that is sent by a switch to all the interfaces in the VLAN. This can
occur if the destination MAC address for a frame has not yet been learned by the switch, making
it an unknown unicast.
• Limit just broadcast and multicast frames – Apply rate limiting to broadcast and multicast traffic
arriving on the interface
• Limit just broadcast frames – Apply rate limiting to broadcast traffic arriving on the interface
The ingress rate limit is rounded to the nearest increment, depending on the the granularity available for
that rate. The granularities are different depending on the range of rates:
• 128kbps ~ 1Mbps – increments of 64kbps
• 1Mbps ~ 100Mbps – increments of 1Mbps
• 100Mbps ~ 1000Mbps – increments of 10Mbps (for gigabit ports)