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Fabric OS FCIP Administrator’s Guide 57
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FCIP services license
3
Compression on FCIP tunnels
Data compression can be enabled or disabled on FCIP tunnels. The default setting is to disable
compression.
Traffic shaping
Traffic can be shaped by establishing a rate limit per tunnel. A committed rate guarantees a fixed
amount of bandwidth and is assigned to a tunnel. The committed rate setting ensures that an FCIP
tunnel operates at the specific fixed rate for FCIP traffic. The rest of the possible 1000 Mbps rate
that a GE interface provides is available to other tunnels created on this GE interface. If the
committed rate is too small for the amount of FCIP traffic, the FCIP tunnel is limited to that rate and
performance may be affected. Total bandwidth of all committed and uncommitted rate tunnels
must not exceed 1000 Mbps. When allocating committed rates to tunnels, do not allocate more
bandwidth than the WAN can support or your FCIP tunnel may not be stable.
FCIP services license
Most of the FCIP extension services described in this chapter require the Brocade High Performance
Extension over FCIP/FC license
. Use the licenseShow command to verify the license is present on
the hardware used on both ends of the FCIP tunnel.
QoS implementation over FCIP
Refer to “QoS, DSCP, and VLANs” on page 24 for a definition of QoS policies.
Fabric OS versions 6.0.0 and later provide for Fibre Channel QoS through internal QoS priorities.
Those priorities can be mapped to TCP/IP network priorities. There are two options for TCP/IP
network-based QoS:
• Layer 3 Differentiated Services Code Point (DSCP).
• VLAN tagging and Layer 2 Class of Service (L2CoS).
DSCP Quality of Service
Refer to “DSCP Quality of Service” on page 24 for a definition of Quality of Service (QoS).
DSCP settings are useful only if IP routers are configured to enforce QoS policies uniformly within
the network. IP routers use the DSCP value as an index into a Per Hop Behavior (PHB) table. Control
connections and data connections may be configured with different DSCP values. Before
configuring DSCP settings, determine if the IP network you are using implements PHB, and consult
with the network administrator to determine the appropriate DSCP values.