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8-23
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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