How Fip Snooping Works - HP 5920 SERIES Fc And Fcoe Configuration Manual

How FIP snooping works

After FIP snooping is enabled for a VLAN, Ethernet interfaces on the Transit switch establish FIP snooping
rules according to FIP frames (with EtherType as 0x8914). Then, the Ethernet interfaces control the
forwarding of FCoE frames (with EtherType as 0x8906) based on the FIP snooping rules.
To facilitate description, the following definitions are specified:
FIP snooping rules generated on an Ethernet interface operating in FCF mode are called FCF FIP
•
snooping rules.
• FIP snooping rules generated on an Ethernet interface operating in ENode mode are called ENode
FIP snooping rules.
Establishing FIP snooping rules
FIP snooping rules are established when a virtual link is established between an ENode and an FCF
switch. The following workflow is used to establish FIP snooping rules:
1. After receiving an unsolicited Discovery Advertisement from an FCF switch, the Ethernet interface
in FCF mode on the Transit switch performs the following operations:
a. Generates an FCF FIP snooping rule based on the unsolicited Discovery Advertisement.
b. Forwards the unsolicited Discovery Advertisement to the ENode.
The FCF FIP snooping rule allows FCoE frames meeting the following requirements to pass through:
The source MAC address is the MAC address in the unsolicited Discovery Advertisement (FCoE
MAC address of the FCF switch).
The 24 most significant bits of the destination MAC address is the FC-MAP value configured for
the VLAN.
2. The Transit switch receives a Discovery Solicitation from the ENode on the Ethernet interface in
ENode mode.
3. The Transit switch forwards the Discovery Solicitation to the FCF switch through the Ethernet
interface in FCF mode.
4. The Transit switch receives a FIP FLOGI request from the ENode on the Ethernet interface in ENode
mode.
5. The Transit switch forwards the FIP FLOGI request to the FCF switch through the Ethernet interface
in FCF mode.
6. When forwarding the FLOGI LS_ACC packet from the FCF switch to the ENode, the Ethernet
interface in ENode mode performs the following operations:
a. Obtains the FC address assigned by the FCF switch to the ENode and the FCoE MAC address
of the FCF switch.
b. Generates an ENode FIP snooping rule.
The ENode FIP snooping rule allows FCoE frames meeting the following requirements to pass
through:
The source MAC address is the FPMA (composed of FC-MAP as the 24 most significant bits and
FC address as the 24 least significant bits).
The destination MAC address is the FCoE MAC address of the FCF switch.
FIP snooping rules exist as long as the virtual link is present, and they are deleted when you delete the
virtual link.
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