Users Guide

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 27. 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 Restrictions
The following restrictions apply when you congure FIP snooping.
• The maximum number of FCoE VLANs supported:
– on an S5000 NPIV proxy gateway is 12.
– on an S5000 switch not congured as an NPIV proxy gateway is eight.
• The maximum number of FCFs supported on a FIP snooping-enabled VLAN:
– on an S5000 NPIV proxy gateway is 12.
– on an S5000 switch not congured as an NPIV proxy gateway is 12.
• The maximum number of FIP snooping sessions (including NPIV sessions) supported per ENode server is 64 and is user-
congurable.
In a full FCoE NPIV conguration, 64 sessions (one FLOGI + 63 NPIV sessions) are supported per ENode server.
• Links to other FIP snooping bridges on a FIP snooping-enabled port (bridge-to-bridge links) are not supported on the S5000
switch.
• The DCBx version that you congure on an interface determines the server CNA trac that FIP snooping supports on the
interface:
– CEE-DCBX supports T11-compliant Gen-2 CNAs.
– CIN-DCBX supports Gen-1 CNAs.
– IEEE 802.1Qaz (Draft 2.5) supports Gen-2 CNAs.
You can also congure an interface to operate using the DCBx version received from a peer (the auto-configure option). In this
case, the S5000 switch detects the capabilities of a CNA and auto-congures the interface to the correct DCBx mode.
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FCoE Transit