Cisco MDS 9000 series Configuration Manual page 44

Configuring FCIP
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
Figure 2-11
FC
B ports bridge Fibre Channel traffic from a local E port to a remote E port without participating in
fabric-related activities such as principal switch election, domain ID assignment, and Fibre Channel
fabric shortest path first (FSPF) routing. For example, Class F traffic entering a SAN extender does not
interact with the B port. The traffic is transparently propagated (bridged) over a WAN interface before
exiting the remote B port. This bridge results in both E ports exchanging Class F information that
ultimately leads to normal ISL behavior such as fabric merging and routing.
FCIP links between B port SAN extenders do not exchange the same information as FCIP links between
E ports, and are therefore incompatible. This is reflected by the terminology used in FC-BB-2: while VE
ports establish a virtual ISL over an FCIP link, B ports use a B access ISL.
Cisco MDS 9000 Family NX-OS IP Services Configuration Guide
2-20
FCIP B Port and Fibre Channel E Port
Switch A
FC
F
FC
F
F
FC
Switch B
FC
E
F
FC
Switch A
FC
F
F
FC bridge
E
FC
FC B
Switch B
FC
E
FC
E port
IP
FCIP link
VE GE
Virtual ISL
B port
FCIP link
B
access
B access ISL
E FC
F
ISL
Chapter 2
Switch C
GE
VE
FC bridge
B FC
B
access
Switch C
IP
FC
E
ISL
OL-19525-01,Cisco MDS NX-OS Release 4.2(1)
Configuring FCIP
FC
F
E
FC
FC
F
E
FC