Enabling Rip Auto Summarization; Specifying The Default Route Metric - Patton electronics SmartNode Series Software Configuration Manual

SmartWare Software Configuration Guide
Example: Enabling RIP announcing
The following example shows how to enable the RIP default routes and IP host routes RIP announcing
method on IP interface wan on a SmartNode.
SN(cfg)#context ip router
SN(ctx-ip)[router]#interface wan
SN(if-ip)[wan]#rip announce default
SN(if-ip)[wan]#rip announce host

Enabling RIP auto summarization

Summarizing routes in RIP Version 2 improves scalability and efficiency in large networks.
Auto-summarization attempts to automatically summarize groups of adjacent routes into single entries, the
goal being to reduce the total number of entries in the RIP routing table, reducing the size of the table and
allowing the router to handle more routes.
RIP auto-summarization (automatic network number summarization) is disabled by default. With auto-sum-
marization, the SmartNode summarizes sub prefixes to the Class A, Class B, and Class C network boundary
when class network boundaries are crossed.
This procedure describes how to enable RIP auto-summarization on an interface
Mode: Interface
Step Command
1 node (if-ip)[ name ]#rip auto-summary Enables RIP auto-summarization on interface name
Example: Enabling RIP auto-summarization
The following example shows how to enable auto-summarization on IP interface wan on a SmartNode.
SN(cfg)#context ip router
SN(ctx-ip)[router]#interface wan
SN(if-ip)[wan]#rip auto-summary

Specifying the default route metric

RIP uses a single routing metric (hop count) to measure the distance between the source and a destination net-
work. Each hop in a path from source to destination is assigned a hop-count value, which is typically 1. When
a SmartNode receives a routing update that contains a new or changed destination-network entry, the Smart-
Node adds one to the metric value indicated in the update and enters the network in the routing table. The IP
address of the sender is used as the next hop.
RIP prevents routing loops from continuing indefinitely by implementing a limit on the number of hops
allowed in a path from the source to a destination. The maximum number of hops in a path is 15. If a Smart-
Node receives a routing update that contains a new or changed entry, and if increasing the metric value by one
causes the metric to be infinity (that is, 16), the network destination is considered unreachable.
Because metrics cannot be directly compared, you must specify the default metric in order to designate the cost
of the redistributed route used in RIP updates. All routes that are redistributed will use the default metric.
RIP configuration task list
16 • RIP configuration
Purpose
189