Cisco 500 series Administration Manual page 168

Smartports
Smartport Types
NOTE
Cisco 500 Series Stackable Managed Switch Administration Guide
Special Smartport Types
There are two special Smartport types; default and unknown. These two types
are not associated with macros, but they exist to signify the state of the interface
regarding Smartport.
The following describe these special Smartport types:
• Default
An interface that does not (yet) have a Smartport type assigned to it has the
Default Smartport status.
If Auto Smartport assigns a Smartport type to an interface and the interface
is not configured to be Auto Smartport Persistent, then its Smartport type is
re-initialized to Default in the following cases:
- A link down/up operation is performed on the interface.
- The switch is restarted.
- All devices attached to the interface have aged out, which is defined as
the absence of CDP and/or LLDP advertisement from the device for a
specified time period.
• Unknown
If a Smartport macro is applied to an interface and an error occurs, the
interface is assigned the Unknown status. In this case, the Smartport and
Auto Smartport features do not function on the interface until you correct
the error and applies the Reset action (performed in the Interface Settings
pages) that resets the Smartport status.
See the workflow area in
troubleshooting tips.
Throughout this section, the term "aged out" is used to describe the LLDP and CDP
messages via their TTL. If Auto Smartport is enabled, and persistent status is
disabled, and no more CDP or LLDP messages are received on the interface before
both TTLs of the most recent CDP and LLDP packets decrease to 0, then the anti-
macro is run, and the Smartport type returns to default.
Common Smartport Tasks
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