SROS Command Line Interface Reference Guide
Global Configuration Mode Command Set
5991-2114
© Copyright 2007 Hewlett-Packard Development Company, L.P.
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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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