Dell Brocade 6520 Command Reference Supporting Fabric OS v7.1.0 - Page 85

aptPolicy 2 EXAMPLES 3 -ap ap_policy 0 1 This policy optimizes the utilization of the available paths by allowing I/O traffic between different source fabric device (SID) or destination fabric device (DID) pairs to use different paths. 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 Originator Exchange ID (OXID) field. This helps to ensure that the exchanges between a pair of devices stay in order. 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. Exchange-based routing policy (default). With this policy, the path chosen for an ingress frame is based on all of the following items: • The ingress port on which the frame was received. • The FC address of the SID for this frame. • The FC address of the DID for this frame. • The FC OXID for this frame. This policy optimizes the utilization of the available paths by allowing I/O traffic between different SID, DID, or OXID pairs to use different paths. All frames received on an ingress port with the same SID, DID, or OXID parameters take the same path unless there is a fabric event. Refer to dlsSet for the definition of a fabric event. This policy does not support static routes. DLS is always enabled and the DLS setting cannot change with this policy. Specifies an additional AP policy option supported under both port-based and exchange-based policies. If logical fabrics are enabled, this command is valid only on the base switch. The following policies are supported: AP Shared Link Policy (default). AP Dedicated Link Policy. This policy dedicates some links to the ingress traffic and some links to the egress traffic. This policy relieves internal congestion in an environment where there is a large amount of traffic going through both directions at the same time. In addition, it can reduce the impact of slow devices on the overall switch performance. To display the current APT policy: switch:admin> aptpolicy Current Policy: 3 1(ap) 3 1 (ap): Default Policy 1: Port Based Routing Policy 2: Device Based Routing Policy (FICON support only) 3: Exchange Based Routing Policy 0: AP Shared Link Policy 1: AP Dedicated Link Policy Fabric OS Command Reference 57 53-1002746-01