Chapter 2 0 Configuring Port Tracking; Configuring Port Tracking; Information About Port Tracking - Cisco Nexus 5000 Series Configuration Manual

Configuring Port Tracking

This chapter describes how to configure port tracking.
This chapter includes the following sections:
•
Configuring Port Tracking
Cisco SAN switches offer the port tracking feature on physical Fibre Channel interfaces (but not on virtual
Fibre Channel interfaces). 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.

Information About Port Tracking

Port tracking allows you to use information about the operational state of the link so that you can initiate a
failure in the link that connects the edge device. Converting the indirect failure to a direct failure triggers a
faster recovery process towards redundant links. When enabled, port tracking brings down the configured
links based on the failed link and forces the traffic to be redirected to another redundant link.
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 keepalive mechanism is dependent on several factors such as the timeout values (TOVs) and on registered
state change notification (RSCN) information.
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