Brocade Fabric OS FCIP Administrator's Guide v7.1.0 (53-1002748-01, March 2013)

24 Fabric OS FCIP Administrator’s Guide
53-1002748-01
PP-TCP-QoS priorities over an FCIP trunk
2
• QoS medium - The default value is 30 percent of the available bandwidth.
• QoS low - The default value is 20 percent of the available bandwidth.
QoS priority is based on the VC (Virtual Circuit) that carries data into the FCIP Engine. For example,
if data enters on a high VC, it is placed on a high TCP connection; if it enters on a low VC then it is
placed on the low TCP circuit. Data is assigned to the proper VC based on zone name prefix.
Figure 7 illustrates the internal architecture of TCP connections that handle PP-TCP-QoS. Note that
this illustrates a tunnel containing a single circuit only.
FIGURE 7 TCP connections for handling QoS
Modifying default values
For the 7800 switch and FX8-24 blade, you can modify the default values. Note that this only
changes the QoS priority distribution in the tunnel and does not reconfigure the fabric.
Change the priority percentages on the 8 Gbps platforms using the optional Percentage tunnel
argument for the portcfg fciptunnel create and portcfg fciptunnel modify commands. When
configuring QoS percentages for each level, remember the following:
• The three values must equal 100 percent.
• A minimum of 10 percent is required for each level.
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