Configuring Port Tracking; About Port Tracking - Cisco AP775A - Nexus Converged Network Switch 5010 Configuration Manual

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Configuring Port Tracking

The port tracking feature is unique to the Cisco MDS 9000 Family of switches. This feature uses
information about the operational state of the link to initiate a failure in the link that connects the edge
device. This process of converting the indirect failure to a direct failure triggers a faster recovery process
towards redundant links. When enabled, the port tracking feature brings down the configured links based
on the failed link and forces the traffic to be redirected to another redundant link.
This chapter includes the following sections:
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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
Model" section on page 37-1
In Figure
ISL 2 fails between the two switches, recovery depends on TOVs, RSCNs, and other factors.
Figure 65-1
Direct link 1
OL-17256-03, Cisco MDS NX-OS Release 4.x
About Port Tracking, page 65-1
Port Tracking, page 65-2
Default Port Tracking Settings, page 65-6
and
65-1, 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
C H A P T E R
"About RSCN Information" section on page
WAN or
MAN
WAN or
MAN
Cisco MDS 9000 Family Fabric Manager Configuration Guide
65
"Common Information
34-5).
FC FC
65-1