HP 1606 Fabric OS FCIP Administrators Guide v6.4.0 (53-1001766-01, November 20 - Page 29

QoS SID/DID priorities over an FCIP trunk 2 QoS SID/DID priorities over an FCIP trunk QoS SID/DID traffic prioritization is a capability of Brocade Fabric OS Adaptive Networking licensed feature. This feature allows you to prioritize FC traffic flows between initiators and targets. Each circuit has four internal TCP connections that manage QoS SID/DID priorities over an FCIP tunnel, as illustrated in Figure 7. The priorities are as follows: • F class - F class is the highest priority, and is assigned bandwidth as needed at the expense of lower priorities, if necessary. • QoS high - The QoS high priority gets at least 50% of the available bandwidth. • QoS medium - The QoS medium priority gets at least 30% of the available bandwidth. • QoS low - The QoS low priority gets at least 20% of the available bandwidth. These priorities are enforced only when there is congestion on the network. If there is no congestion, all traffic is handled at the same priority. VE Port Internal Architecture Tunnel Circuit High Priority Med. Priority Low Priority Virtual Tunnel Virtual Tunnel Virtual Tunnel F-Class Virtual Tunnel Virtual Circuit Virtual Circuit Virtual Circuit Virtual Circuit TCP TCP TCP TCP Connection Connection Connection Connection IP Interface GE Port FIGURE 7 TCP connections for handling QoS SID/DID-based FC traffic prioritization Fabric OS FCIP Administrator's Guide 15 53-1001766-01