Reference Guide

Fabric OS FCIP Administrator’s Guide 25
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QoS, DSCP, and VLANs
2
When both DSCP and L2CoS are used
If an FCIP tunnel or circuit is VLAN tagged, both DSCP and L2CoS are relevant, unless the VLAN is
end-to-end, with no intermediate hops in the IP network. Table 4 shows the default mapping of
DSCP priorities to L2CoS priorities. This may be helpful when consulting with the network
administrator. These values are modified on a per-FCIP circuit basis for the 7800 switch and
FX8-24 blade.
DSCP and VLAN support on FCIP circuits
When a VLAN tag is created on an FCIP circuit, all traffic over that circuit will use the specified
VLAN. Options listed in Table 5 are available on both the portcfg fciptunnel command to enable
VLAN support on circuit 0, and on the portcfg fcipcircuit command for additional circuits.
TABLE 4 Default mapping of DSCP priorities to L2CoS priorities
DSCP priority/bits L2CoS priority/bits Assigned to:
46 / 101110 7 / 111 Class F
7 / 000111 1 / 001 Medium QoS
11 / 001011 3 / 011 Medium QoS
15 / 001111 3 / 011 Medium QoS
19 / 010011 3 / 011 Medium QoS
23 / 010111 3 / 011 Medium QoS
27 / 011011 0 / 000 Class 3 Multicast
31 / 011111 0 / 000 Broadcast/Multicast
35 / 100011 0 / 000 Low Qos
39 / 100111 0 / 000 Low Qos
43 / 101011 4 / 100 High QoS
47 / 101111 4 / 100 High QoS
51 / 110011 4 / 100 High QoS
55 / 110111 4 / 100 High QoS
59 / 111011 4 / 100 High QoS
63 / 111111 0 / 000 Reserved
TABLE 5 VLAN and DSCP options
Options Description
VLAN
-v
- -vlan-tagging <vlan_id>
The <vlan_id> parameter sets the VLAN tag value in the header assigning the
traffic to that specific VLAN. The VLAN tag is an integer value between 1 and
4094. Consult with your WAN administrator to discuss VLAN implementation.