Administrator Guide

FIP Snooping in a Switch Stack
FIP snooping supports switch stacking as follows:
• A switch stack conguration is synchronized with the standby stack unit.
• Dynamic population of the FCoE database (ENode, Session, and FCF tables) is synchronized with the standby stack unit. The FCoE
database is maintained by snooping FIP keep-alive messages.
• In case of a failover, the new master switch starts the required timers for the FCoE database tables. Timers run only on the master
stack unit.
Using FIP Snooping
There are four steps to congure FCoE transit.
1 Enable the FCoE transit feature on a switch.
2 Enable FIP snooping globally on all Virtual Local Area Networks (VLANs) or individual VLANs on a FIP snooping bridge.
3 Congure the FC-Map value applied globally by the switch on all VLANs or an individual VLAN.
4 Congure FCF mode for a FIP snooping bridge-to-FCF link.
For a sample FIP snooping conguration, refer to FIP Snooping Conguration Example.
Statistical information is available for FIP Snooping-related information. For available commands, refer to the FCoE Transit chapter in the
Dell Networking OS Command Line Reference Guide.
FIP Snooping Prerequisites
Before you enable FCoE transit and congure FIP snooping on a switch, ensure that certain conditions are met.
A FIP snooping bridge requires data center bridging exchange protocol (DCBx) and priority-based ow control (PFC) to be enabled on the
switch for lossless Ethernet connections (refer to the Data Center Bridging (DCB) chapter). Dell Networking recommends also enabling
enhanced transmission selection (ETS); however, ETS is recommended but not required.
If you enable DCBx and PFC mode is on (PFC is operationally up) in a port conguration, FIP snooping is operational on the port. If the PFC
parameters in a DCBx exchange with a peer are not synchronized, FIP and FCoE frames are dropped on the port after you enable the FIP
snooping feature.
For VLAN membership, you must:
• create the VLANs on the switch which handles FCoE trac (use the interface vlan command).
• congure each FIP snooping port to operate in Hybrid mode so that it accepts both tagged and untagged VLAN frames (use the
portmode hybrid command).
• congure tagged VLAN membership on each FIP snooping port that sends and receives FCoE trac and has links with an FCF, ENode
server, or another FIP snooping bridge (use the tagged port-type slot/port command).
The default VLAN membership of the port must continue to operate with untagged frames. FIP snooping is not supported on a port that is
congured for non-default untagged VLAN membership.
Important Points to Remember
• Enable DCBx on the switch before enabling the FIP Snooping feature.
• To enable the feature on the switch, congure FIP Snooping.
• To allow FIP frames to pass through the switch on all VLANs, enable FIP snooping globally on a switch.
• A switch can support a maximum eight VLANs. Congure at least one FCF/bridge-to-bridge port mode interface for any FIP snooping-
enabled VLAN.
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FIP Snooping