DCFM Enterprise User Manual (53-1001775-01, June 2010)

DCFM Enterprise User Manual 383
53-1001775-01
QoS SID/DID priorities over an FCIP trunk
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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 hosts and targets.
Four internal TCP connections provide internal circuits for managing QoS SID/DID priorities over an
FCIP tunnel, as illustrated in Figure 152. 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.
FIGURE 152 TCP connections for handling QoS SID/DID-based FC traffic prioritization
Virtual
Tunnel
Tunnel
VE Port Internal Architecture
Circuit
GE Port
High Priority Med. Priority Low Priority F-Class
Virtual
Tunnel
Virtual
Tunnel
Virtual
Tunnel
Virtual
Circuit
Virtual
Circuit
Virtual
Circuit
Virtual
Circuit
TCP
Connection
IP
Interface
TCP
Connection
TCP
Connection
TCP
Connection