Impact on Other Software FeaturesWhen 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 SnoopingImpact DescriptionMAC address learning MAC address learning is not performed on FIP and FCoE frames,which are denied by ACLs dynamically created by FIP snooping onserver-facing ports in ENode mode.MTU auto-configuration MTU size is set to mini-jumbo (2500 bytes) when a port is inSwitchport mode, the FIP snooping feature is enabled on theswitch, 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 PFCmode is on (PFC is operationally up).STP If you enable an STP protocol (STP, RSTP, PVSTP, or MSTP) onthe switch and ports enter a blocking state, when the state changeoccurs, the corresponding port-based ACLs are deleted. If a port isenabled for FIP snooping in ENode or FCF mode, the ENode/FCFMAC-based ACLs are deleted.FIP Snooping RestrictionsThe following restrictions apply when you configure 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 twelve.• When FCoE is configured on fanned-out ports or unusable 100G ports, traffic outage occurs for about 45 seconds.Configuring FIP SnoopingYou can enable FIP snooping globally on all FCoE VLANs on a switch or on an individual FCoE VLAN.By default, FIP snooping is disabled.To enable FCoE transit on the switch and configure the FCoE transit parameters on ports, follow these steps.1 Enable the FCoE transit feature on a switch.CONFIGURATION mode.feature fip-snooping2 Enable FIP snooping on all VLANs or on a specified VLAN.CONFIGURATION mode or VLAN INTERFACE mode.fip-snooping enable3 Configure the port for bridge-to-FCF links.INTERFACE mode or CONFIGURATION modeFIP Snooping 321
