A Uniform Resource Locator (URL), as defined in RFC1738,
for the default management information for this device.
This URL is typically used by a HTTP browser to display
management information for this device. This default
page should contain links to any other management
pages for this device.
Unique identifier for this entity. This ID
must not change even if network address or
removable cards are changed. For devices with
fixed MAC addresses this may be the same as
ifPhysAddress; for devices with fixed serial
numbers this may be the same as