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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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FIP Snooping on Ethernet Bridges

In a converged Ethernet network, intermediate Ethernet bridges can snoop on FIP packets during the login process on an FCF. Then, using ACLs, a transit bridge can permit only authorized FCoE traffic to be transmitted between an FCoE end-device and an FCF. An Ethernet bridge that provides these functions is called a FIP snooping bridge (FSB).

On a FIP snooping bridge, ACLs are created dynamically as FIP login frames are processed. The ACLs are installed on switch ports configured for ENode mode for server-facing ports and FCF mode for a trusted port directly connected to an FCF.

Enable FIP snooping on the switch and configure the FIP snooping parameters. When you enable FIP snooping, all ports on the switch by default become ENode ports.

Dynamic ACL generation on the switch operating as a FIP snooping bridge function as follows:

Global ACLs These are applied on server-facing ENode ports.
Port-based ACLs These ACLs are applied on all three port modes: on ports directly connected to an FCF, server-facing ENode ports, and bridge-to-bridge links. Port-based ACLs take precedence over global ACLs.
FCoE-generated ACLs These take precedence over user-configured ACLs. A user-configured ACL entry cannot deny FCoE and FIP snooping frames.

The following illustration shows an FN IOM used as a FIP snooping bridge in a converged Ethernet network. The top-of-rack (ToR) switch operates as an FCF for FCoE traffic. Converged LAN and SAN traffic is transmitted between the ToR switch and an FN IOM switch. The FN IOM switch operates as a lossless FIP snooping bridge to transparently forward FCoE frames between the ENode servers and the FCF switch.

Figure 1. FIP Snooping on an FN IOM Switch Illustration of FIP snooping on an MXL 10/40GbE switch.
The following sections describe how to configure the FIP snooping feature on a switch that functions as a FIP snooping bridge so that it can perform the following functions:
  • Perform FIP snooping (allowing and parsing FIP frames) globally on all VLANs or on a per-VLAN basis.
  • To assign a MAC address to an FCoE end-device (server ENode or storage device) after a server successfully logs in, set the FCoE MAC address prefix (FC-MAP) value an FCF uses.
  • To provide more port security on ports that are directly connected to an FCF and have links to other FIP snooping bridges, set the FCF or Bridge-to-Bridge Port modes.
  • To ensure that they are operationally active, check FIP snooping-enabled VLANs.
  • Process FIP VLAN discovery requests and responses, advertisements, solicitations, FLOGI/FDISC requests and responses, FLOGO requests and responses, keep-alive packets, and clear virtual-link messages.

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