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About Port Tracking
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 .
About Port Tracking
Generally, hosts can instantly recover from a link failure on a link that is immediately (direct link)
connected to a switch. However, recovering from an indirect link failure between switches in a WAN or
MAN fabric with a keep-alive mechanism is dependent on several factors such as the time out values
(TOVs) and on registered state change notification (RSCN) information (see the
Out Values" section on page 25-2
In
Figure
ISL 2 fails between the two switches, recovery depends on TOVs, RSCNs, and other factors.
Figure 48-1
Direct link 1
The port tracking feature monitors and detects failures that cause topology changes and brings down the
links connecting the attached devices. When you enable this feature and explicitly configure the linked
and tracked ports, the Cisco SAN-OS software monitors the tracked ports and alters the operational state
of the linked ports on detecting a link state change.
Port Tracking Terminology
The following terms are used in this chapter.
•
•
Cisco MDS 9000 Family Configuration Guide
48-2
48-1, when the direct link 1 to the host fails, recovery can be immediate. However, when the
Traffic Recovery Using Port Tracking
ISL2
X
X
FC
FC
Tracked ports—A port whose operational state is continuously monitored. The operational state of
the tracked port is used to alter the operational state of one or more ports. Fibre Channel, VSAN,
PortChannel, FCIP, or a Gigabit Ethernet port can be tracked. Generally, ports in E and TE port
modes can also be Fx ports
Linked ports—A port whose operational state is altered based on the operational state of the tracked
ports. Only a Fibre Channel port can be linked.
and
"About RSCN Information" section on page
WAN or
MAN
WAN or
MAN
Chapter 48
Configuring Port Tracking
"Fibre Channel Time
22-7).
FC
FC
OL-6973-03, Cisco MDS SAN-OS Release 2.x
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