Dell PowerConnect Brocade 300 Fabric OS Administrator's Guide v7.1.0 - Page 120
Device-based routing, AP route policies, Routing in Virtual Fabrics
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4 Routing policies Device-based routing Device-based routing optimizes routing path selection and utilization based on the Source ID (SID) and Destination ID (DID) of the path source and destination ports. As a result, every distinct flow in the fabric can take a different path through the fabric. Effectively, device based routing works the same as exchange-based routing but does not use the OXID field. This helps to ensure that the exchanges between a pair of devices stay in order. NOTE Device-based routing requires the use of the Dynamic Load Sharing (DLS) feature; when this policy is in effect, you cannot disable the DLS feature. Device-based routing is also a form of Dynamic Path Selection (DPS). DPS assigns communication paths between end devices in a fabric to egress ports in ratios proportional to the potential bandwidth of the ISL, ICL, or trunk group. When there are multiple paths to a destination, the input traffic is distributed across the different paths in proportion to the bandwidth available on each of the paths. This improves utilization of the available paths and reduces possible path congestion. NOTE Device-based routing is supported in FICON environments only. AP route policies Two additional AP policies are supported under exchange-based routing: • AP Shared Link policy (default) • AP Dedicated Link policy NOTE AP policies are independent of routing policies. Every routing policy supports both AP policies. The AP Dedicated Link policy relieves internal congestion in an environment where: • There is a large amount of traffic going through both directions at the same time. • There is a reduction of the effect of slow devices on the overall switch performance. It is recommended that the default AP Shared Link policy be used for most environments. Also, it is recommended that you design a SAN that localizes host-to-target traffic by reducing the amount of traffic through the router. ATTENTION Setting either AP route policy is a disruptive process. Routing in Virtual Fabrics Virtual Fabrics support DPS on all partitions. DPS is limited where multiple paths are available for a logical fabric frame entering a Virtual Fabrics chassis from a base fabric that is sent out using one of the dedicated ISLs in a logical switch. The AP policy affecting the DPS behavior, whether it is exchange-based, device-based, or port-based, is configured on a per-logical switch basis. In-order delivery (IOD) and DLS settings are set per logical switch as well. IOD and DLS settings for the base switch affect all traffic going over the base fabric including any logical fabric traffic that uses the base fabric. 120 Fabric OS Administrator's Guide 53-1002745-02
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