Link Initialization Flow - Cisco 9134 - MDS Multilayer Fabric Switch Troubleshooting Manual

Chapter 8 Troubleshooting Ports
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

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:
•
•
•
•
Figure 8-6
•
•
•
•
Figure 8-6
Port A
AC
LF1
OL1
LR2
AC
Figure 8-6
and the primary operational states of the port during the process. They include:
1.
2.
OL-9285-05
Not operational sequence (NOS)
Offline sequence (OLS)
Link reset sequence (LRS)
Link reset response sequence (LRR)
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
Link Initialization Flow
Link Failure Condition
NOS
PLS
LR
LRR
Idle
Idle
shows the link initialization flow. It displays the ordered sets transmitted between the ports
Active state.
Link recovery state (LR):
a. LR transmit substate (LR1)
b. LR receive substate (LR2)
c. LRR receive substate (LR3)
Ordered sets of 8B/10B coding:
NOS = Not Operational Sequence
Port B
OLS = Offline Sequence
AC
LR = Link Reset
OL3
LF2 LRR = Link Reset Response
OL2
Ordered sets of 8B/10B coding:
LR1
RC = Active State
LR3
LR = Link Recovery State
LF = Link Failure STate
AC
OL = Offline State
Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
Common Problems with Port Interfaces
8-23