Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.100.0 - Page 303
Con the FC-MAP Value, Con a Port for a Bridge-to-Bridge Link, Con a Port for
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• You must configure at least one interface for FCF (FCoE Forwarder) mode on a FIP snooping-enabled VLAN. You can configure 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 traffic only from the first eight incoming VLANs. When enabled on a per-VLAN basis, FIP snooping is supported on up to eight VLANs. Configure the FC-MAP Value You can configure the FC-MAP value to be applied globally by the switch on all or individual FCoE VLANs to authorize FCoE traffic. The configured 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 switchbridge only when the FC-MAP value on the FCF matches the FC-MAP value on the FIP snooping bridge. Configure a Port for a Bridge-to-Bridge Link If a switch port is connected to another FIP snooping bridge, configure the FCoE-Trusted Port mode for bridge-bridge links. Initially, all FCoE traffic 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 traffic is allowed on the port only after the switch learns the FC-MAP value associated with the specified FCF MAC address and verifies that it matches the configured FC-MAP value for the FCoE VLAN. Configure a Port for a Bridge-to-FCF Link If a port is directly connected to an FCF, configure the port mode as FCF. Initially, all FCoE traffic is blocked; only FIP frames are allowed to pass. FCoE traffic is allowed on the port only after a successful fabric login (FLOGI) request/response and confirmed use of the configured FCMAP 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 25. Impact of Enabling FIP Snooping Impact MAC address learning MTU auto-configuration Link aggregation group (LAG) Description 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 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. FIP snooping is supported on port channels on ports on which PFC mode is on (PFC is operationally up). FIP Snooping 303
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