Administrator Guide

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.
Link aggregation group (LAG) FIP snooping is supported on port channels on ports on which
PFC mode is on (PFC is operationally up).
STP If you enable an STP protocol (STP, RSTP, PVSTP, or MSTP) on
the switch and ports enter a blocking state, when the state
change occurs, the corresponding port-based ACLs are deleted.
If a port is enabled for FIP snooping in ENode or FCF mode, the
ENode/FCF MAC-based ACLs are deleted.
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 theData 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.
FIP Snooping Restrictions
The following restrictions apply when you congure FIP snooping.
• The maximum number of FCoE VLANs supported on the switch is eight.
• The maximum number of FIP snooping sessions supported per ENode server is 32. To increase the maximum number of sessions
to 64, use the fip-snooping max-sessions-per-enodemac command.
• The maximum number of FCFs supported per FIP snooping-enabled VLAN is 12.
• Links to other FIP snooping bridges on a FIP snooping-enabled port (bridge-to-bridge links) are not supported on the MXL
switch.
Conguring FIP Snooping
You can enable FIP snooping globally on all FCoE VLANs on a switch or on an individual FCoE VLAN.
By default, FIP snooping is disabled.
FCoE Transit
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