Dell PowerConnect Brocade 300 Fabric OS Administrator's Guide v7.1.0 - Page 518
Ingress Rate Limiting
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21 Ingress Rate Limiting • Ingress Rate Limiting Ingress Rate Limiting restricts the speed of traffic from a particular device to the switch port. Ingress Rate Limiting requires an Adaptive Networking license. See "Ingress Rate Limiting" on page 518 for more information about this feature. • Quality of Service (QoS) SID/DID Traffic Prioritization SID/DID traffic prioritization allows you to categorize the traffic flow between a host and target as having a high or low priority. QoS SID/DID traffic prioritization requires an Adaptive Networking license on 8-Gbps platforms. See "QoS: SID/DID traffic prioritization" on page 519 for more information about this feature. NOTE The Brocade 6520 does not require licenses for the Ingress Rate Limiting and QoS SID/DID features. They are enabled by default. You can use the Adaptive Networking features together to optimize the performance of your fabric. For example, you can do the following: • You can use Top Talkers to identify the SID/DID pairs that consume the most bandwidth and can then configure them with certain QoS attributes so they get proper priority. • If the bottleneck detection feature detects a latency bottleneck, you can use TI zones or QoS SID/DID traffic prioritization to isolate latency device traffic from high-priority application traffic. • If the bottleneck detection feature detects ISL congestion, you can use Ingress Rate Limiting to slow down low-priority application traffic if it is contributing to the congestion. Ingress Rate Limiting Ingress Rate Limiting is a licensed feature that requires the Adaptive Networking license. Ingress Rate Limiting restricts the speed of traffic from a particular device to the switch port. Use Ingress Rate Limiting for the following situations: • To reduce existing congestion in the network or proactively avoid congestion. • To enable you to offer flexible bandwidth-limit services based on requirements. • To enable more important devices to use the network bandwidth during specific services, such as network backup. To limit the traffic, you set the maximum speed at which the traffic can flow through a particular F_Port or FL_Port. For example, if you set the rate limit at 4 Gbps, then traffic from a particular device is limited to a maximum of 4 Gbps. Ingress Rate Limiting enforcement is needed only if the port can run at a speed higher than the rate limit. For example, if the rate limit is 4 Gbps and the port is only a 2-Gbps port, then Ingress Rate Limiting is not enforced. The Ingress Rate Limiting configuration is persistent across reboots. You should keep in mind the following considerations about Ingress Rate Limiting: • Ingress Rate Limiting is applicable only to F_Ports and FL_Ports. • QoS traffic prioritization takes precedence over Ingress Rate Limiting. • Ingress Rate Limiting is not enforced on trunked ports. 518 Fabric OS Administrator's Guide 53-1002745-02
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