Concept Guide

• FIP frames are allowed to pass through the switch on the enabled VLANs and are processed to generate FIP snooping ACLs.
• FCoE trac is allowed on VLANs only after a successful virtual-link initialization (fabric login FLOGI) between an ENode and an FCF. All
other FCoE trac is dropped.
• You must congure at least one interface for FCF (FIP snooping bridge-bridge) mode on a FIP snooping-enabled VLAN. You can
congure multiple FCF trusted interfaces in a VLAN.
• A maximum of eight VLANS are supported for FIP snooping on the switch. When enabled globally, FIP snooping processes FIP packets
in trac only from the rst eight incoming VLANs. When enabled on a per-VLAN basis, FIP snooping is supported on up to eight
VLANs.
Congure the FC-MAP Value
You can congure the FC-MAP value to be applied globally by the switch on all or individual FCoE VLANs to authorize FCoE trac.
The congured FC-MAP value is used to check the FC-MAP value for the MAC address assigned to ENodes in incoming FCoE frames. If
the FC-MAP value does not match, FCoE frames are dropped. A session between an ENode and an FCF is established by the switch-
bridge only when the FC-MAP value on the FCF matches the FC-MAP value on the FIP snooping bridge.
Congure a Port for a Bridge-to-Bridge Link
If a switch port is connected to another FIP snooping bridge, congure the FCoE-Trusted Port mode for bridge-bridge links.
Initially, all FCoE trac is blocked. Only FIP frames with the ALL_FCF_MAC and ALL_ENODE_MAC values in their headers are allowed to
pass. After the switch learns the MAC address of a connected FCF, it allows FIP frames destined to or received from the FCF MAC
address.
FCoE trac is allowed on the port only after the switch learns the FC-MAP value associated with the specied FCF MAC address and
veries that it matches the congured FC-MAP value for the FCoE VLAN.
Congure a Port for a Bridge-to-FCF Link
If a port is directly connected to an FCF, congure the port mode as FCF. Initially, all FCoE trac is blocked; only FIP frames are allowed to
pass.
FCoE trac is allowed on the port only after a successful fabric login (FLOGI) request/response and conrmed use of the congured FC-
MAP value for the VLAN.
FLOGI and fabric discovery (FDISC) request/response packets are trapped to the CPU. They are forwarded after the necessary ACLs are
installed.
Impact on Other Software Features
When you enable FIP snooping on a switch, other software features are impacted. The following table lists the impact of FIP snooping.
Table 18. Impact of Enabling FIP Snooping
Impact Description
MAC address learning MAC address learning is not performed on FIP and FCoE frames,
which are denied by ACLs dynamically created by FIP snooping on
server-facing ports in ENode mode.
MTU auto-conguration MTU size is set to mini-jumbo (2500 bytes) when a port is in
Switchport mode, the FIP snooping feature is enabled on the
switch, and FIP snooping is enabled on all or individual VLANs.
FCoE Transit 309