Optimizing fabric behavior
Adaptive Networking overview
Adaptive Networking is a suite of tools and capabilities that enable you to ensure optimized behavior in
the SAN. Even under the worst congestion conditions, the Adaptive Networking features can maximize the
fabric behavior and provide necessary bandwidth for high-priority, mission-critical applications and
The Top Talkers feature provides real-time information about the top n bandwidth-consuming flows from a
set of a large number of flows passing through a specific port in the network. 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.
The Top Talkers feature is part of the licensed Advanced Performance Monitoring feature. See
monitors" on page 414 for detailed information about Top Talkers.
The following sections cover three features in the Adaptive Networking suite:
Traffic Isolation Routing
QoS Ingress Rate Limiting
QoS SID/DID Traffic Prioritization
Top Talkers, which is another Adaptive Networking feature, is described briefly in this chapter and
described in detail in Chapter 18,
Traffic Isolation Routing
The Traffic Isolation Routing feature allows you to control the flow of interswitch traffic by creating a
dedicated path for traffic flowing from a specific set of source ports (N_Ports). For example, you might use
Traffic Isolation Routing for the following scenarios:
To dedicate an ISL to high priority, host-to-target traffic.
To force high volume, low priority traffic onto a given ISL to limit the effect on the fabric of this high
To ensure that requests and responses of FCIP-based applications such as tape pipelining use the same
VE_Port tunnel across a metaSAN.
Traffic isolation is implemented using a special zone, called a Traffic Isolation zone (TI zone). A TI zone
indicates the set of N_Ports and E_Ports to be used for a specific traffic flow. When a TI zone is activated,
the fabric attempts to isolate all inter-switch traffic entering from a member of the zone only to those E_Ports
that have been included in the zone. The fabric also attempts to exclude traffic not in the TI zone from using
E_Ports within that TI zone.
shows a fabric with a TI zone consisting of the following ports:
N_Ports:1,7, 1,8, 4,5, and 4,6
E_Ports:1,1, 3,9, 3,12, and 4,7
The dashed line indicates the dedicated path from Domain 1 to Domain 4.
"Administering advanced performance
monitoring" on page 405.
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