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
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Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
OL-9285-05
Chapter 8 Troubleshooting Ports
Common Problems with Port Interfaces
Link Initialization Flow
Fibre Channel primitive sequences are used to establish and maintain a link and they continue to be
transmitted until a response has been received. Four primitive sequences are used in the link initialization
process:
•
Not operational sequence (NOS)
•
Offline sequence (OLS)
•
Link reset sequence (LRS)
•
Link reset response sequence (LRR)
Figure 8-6
uses the ordered sets of 8b/10 encoding in the primary operational states. They include:
•
AC = Active state
•
LR = Link recovery state
•
LF = Link failure state
•
OF = Offline state
Figure 8-6
Link Initialization Flow
Figure 8-6
shows the link initialization flow. It displays the ordered sets transmitted between the ports
and the primary operational states of the port during the process. They include:
1.
Active state.
2.
Link recovery state (LR):
a.
LR transmit substate (LR1)
b.
LR receive substate (LR2)
c.
LRR receive substate (LR3)
Port A
Port B
AC
LF1
OL1
LR2
AC
AC
AC
OL3
LF2
OL2
LR1
LR3
NOS
LR
Idle
Idle
PLS
LRR
Ordered sets of 8B/10B coding:
NOS = Not Operational Sequence
OLS = Offline Sequence
LR = Link Reset
LRR = Link Reset Response
Ordered sets of 8B/10B coding:
RC = Active State
LR = Link Recovery State
LF = Link Failure STate
OL = Offline State
Link Failure Condition
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