T11 Fip Snooping Specification; Understanding Using An Fcoe Transit Switch - Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual

Complete Software Guide for Junos

T11 FIP Snooping Specification

Related
Documentation

Understanding Using an FCoE Transit Switch

3582
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OS for EX Series Ethernet Switches, Release 10.4
For more details about FIP snooping, see the Technical Committee T11 organization
document Increasing FCoE Robustness using FIP Snooping at
http://www.t11.org/ftp/t11/pub/fc/bb-5/08-264v3.pdf
Understanding Using an FCoE Transit Switch on page 3582
Example: Configuring FIP Snooping and Priority-Based Flow Control on an FCoE Transit
Switch on page 3587
Configuring FIP Snooping on an FCoE Transit Switch on page 3596
You can use an EX4500 switch as a Fibre Channel over Ethernet (FCoE) transit switch.
An FCoE transit switch is a Layer 2 data center bridging (DCB) switch that can transport
FCoE frames and implement FCoE Initialization Protocol (FIP) snooping. The switch can
transport both FCoE and Ethernet LAN traffic over the same network infrastructure while
preserving the class of service (CoS) that Fibre Channel (FC) traffic requires.
An FCoE transit switch does not encapsulate or decapsulate FC frames in Ethernet. It is
an access switch that transports FC frames that have already been encapsulated in
Ethernet between FCoE initiators such as servers and an FCoE forwarder (FCF), which
is in an FC storage area network (SAN). The transit switch acts as a passthrough switch
and is transparent to the FCF, which detects each connection to an FCoE server as a
direct point-to-point link.
When the switch acts as a transit switch, the VLANs you configure for FCoE traffic can
use any of the switch ingress and egress ports, because the traffic in both directions is
Ethernet traffic. FCoE traffic must use a VLAN dedicated only to FCoE traffic that does
not carry any other traffic.
When the switch acts as a transit switch, you must enable priority-based flow control
(PFC, IEEE standard 802.1Qbb) as a link-level flow control mechanism. See
"Understanding Priority-Based Flow Control" on page 3398 for additional information. FIP
snooping adds security by filtering access so that only traffic from servers that have
successfully logged in to the FC network passes through the transit switch and reaches
the FC network.
The transit switch transparently connects FCoE-capable servers in an Ethernet LAN to
an FCF, which has both FCoE and FC interfaces and processes both the FCoE and FC
protocol stacks. The transit switch acts as a transparent access layer between FCoE
servers and the FCF.
Encapsulated FCoE server traffic flows through the transit switch to the FCoE ports on
the FCF. The FCF removes the Ethernet encapsulation from the FCoE frames to restore
the native FC frames. Native FC traffic travels out FCF FC ports to storage devices in the
FC SAN.
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