HP ProCurve 7102dl Reference Manual page 497

SROS Command Line Interface Reference Guide Global Configuration Mode Command Set
If an attached interface goes down, the associated route is immediately (within the same random
five-second interval) triggered. The next regular update excludes the failed interface. This is the so-called
first hand knowledge rule. If a gateway has first hand knowledge of a route failure (connected interfaces) or
reestablishment, the same action is taken. A triggered update occurs, advertising the route as failed
(metric = 16) or up (normal metric) followed by the normal scheduled update.
The assumption here is that if a gateway missed the triggered update, it will eventually learn from another
gateway in the standard convergence process. This conserves bandwidth.
RIP-Related Definitions:
Route - A description of the path and its cost to a network.
Gateway - A device that implements all or part of RIP - a router.
Hop - Metric that provides the integer distance (number of intervening gateways) to a destination network
gateway.
Advertisement - A broadcast or multicast packet to port 520 that indicates the route for a given destination
network.
Update - An advertisement sent on a regular 30-second interval including all routes exclusive of those
learned on an interface.
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