Dell PowerConnect 8024 User Configuration Manual page 816

Enabling and Disabling FIP Snooping
When FIP snooping is globally enabled on the switch, FC-BB-5 Annex D
ACLs are installed on the switch, and FIP frames are snooped. FIP snooping
will not allow FIP or FCoE frames to be forwarded over a port until the port is
operationally enabled for PFC. VLAN tagging must be enabled on the
interface in order to carry the dot1p values through the network.
When FIP snooping is disabled, received FIP frames are forwarded or flooded
using the normal multicast rules.
Configuring the FC Map Value
When configured using fabric provided MAC addresses, FCoE devices
transmit frames containing the FC map value in the upper 24 bits. Only
frames that match the configured FC map value are passed across the VLAN.
Frames with MAC addresses that do not match the FC map value are
discarded.
Configuring Ports for FIP Snooping
To relay the FIP packets received from the hosts toward the Fibre Channel
forwarders (FCFs), such as an FC router that has a direct FC link into
storage, the switch needs to know the interfaces the FCFs are on. By default,
an interface is configured to be a host facing interface, not an FCF facing
interface.
Dell recommends that FCF-facing ports be placed into auto-upstream mode
in order to receive DCBX information and propagate it to the Converged
Network Adaptors (CNAs) on the downstream ports. Interfaces enabled for
PFC should be configured in trunk or general mode and must be PFC
operationally enabled before FCoE traffic can pass over the port.
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Configuring Data Center Features