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FUJITSU PSWITCH
User’s Guide
116
December/2018
3.1.8.1.5.
DCBX (Data Center Bridging Extensions)
Data Center Bridging Exchange Protocol (DCBX) is used by DCB devices to exchange
configuration information with directly connected peers. DCBX is used in L2 only
environments. The protocol is also used to configure and detect the configuration
mismatch of the peer DCB devices. All of the data center applications (ETS, PFC and
application priority) are used together in the data center to achieve the high
availability, low latency, and loss less (enhanced Ethernet) service on the existing
native Ethernet networks.
DCBX is the interface for the following applications to propagate configuration
information.
Enhanced Transmission Selection (ETS)
Priority-based Flow Control (PFC)
Application Priorities
3.1.8.2.
FIP Snooping
Switches with the FIP Snooping feature enabled are deployed as transit switches in
the FCoE domain in order to provide the enhanced Ethernet transport service over
the native Ethernet cloud in combination with other data center technologies like
PFC, ETS, CN and DCBX.
Only transit switch functionality is supported. FCoE Forwarders (FCF) functionality is
not supported.
The FCoE Initialization Protocol (FIP) is used to perform the functions of FC_BB_E
device discovery, initialization, and maintenance. FIP uses a separate EtherType
from FCoE to distinguish discovery, initialization, and maintenance traffic from
other FCoE traffic. FIP frames are standard Ethernet size (1518 Byte 802.1q frame),
whereas FCoE frames are a maximum of 2240 bytes.
FIP snooping is a frame inspection method used by FIP Snooping Bridges to
monitor FIP frames and apply policies based upon the L2 header information in
those frames. FIP snooping allows for:
Auto-configuration of Ethernet ACLs based on information in the Ethernet
headers of FIP frames.
Emulation of FC point-to-point links within the DCB Ethernet network.
Enhanced FCoE security/robustness by preventing FCoE MAC spoofing.
The role of FIP snooping-enabled ports on the switch falls under one of the
following types: