3Com WX3000 Configuring RIP Route Control, Setting the additional routing metrics of an interface

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Set the preference of RIP to change the preference order of routing protocols. This order makes sense when more than one route to the same destination is discovered by multiple routing protocols.

Redistribute external routes in an environment with multiple routing protocols.

Configuration Prerequisites

Before configuring RIP route control, perform the following tasks:

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Configuring network layer addresses of interfaces so that adjacent nodes are reachable to each other at the network layer

Configuring basic RIP functions

Configuring RIP Route Control

Setting the additional routing metrics of an interface

Additional metric is the metric added to the original metrics of RIP routes on an interface. It does not directly change the metric value of a RIP route in the routing table of a router, but will be added to incoming or outgoing RIP routes on the interface.

Follow these steps to set additional routing metric:

To do...	Use the command...	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Set the additional routing		Optional
metric to be added for	rip metricin value
incoming RIP routes on this		0 by default
interface
Set the additional routing		Optional
metric to be added for	rip metricout value
outgoing RIP routes on this		1 by default
interface

The rip metricout command takes effect only on the RIP routes learnt by the router and the RIP routes generated by the router itself, but the command is invalid for any route imported to RIP from other routing protocols.

Configuring RIP route summarization

Rip route summarization means that when the router advertises RIP updates, different subnet routes in the same natural network segment can be aggregated into one route with a natural mask for transmission to another network segment. This function is used to reduce the routing traffic on the network as well as the size of the routing table.

When it is necessary to advertise RIP route updates in a subnet, disable the route summarization for RIP-2.

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