Avaya Configuring IP Services Bedienungsanleitung PDF herunterladen (Seite 127)

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Configuring RIP Services

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RIP accept policies (and import route ﬁlters) include a subnet mask parameter that

you can use to override the default mask. This parameter works in two ways:

• If you set the parameter with a valid mask value, RIP applies this mask to the

destination address in a received Version 1 update. RIP adds the address/mask

pair to the routing table.

• If you set the subnet mask parameter to 0.0.0.0, RIP uses the default subnet

mask (the mask of the receiving IP interface) only on the condition that the

destination address is a subnet of the same network as the receiving interface.

If the destination address and the address of the IP interface are on different

networks, RIP applies the natural mask of the destination address.

For example, consider a router with an IP interface 2.2.2.2/255.255.0.0. Now

consider that the router receives on that interface a RIP Version 1 routing update

for the following destination networks:

2.1.0.0

3.0.0.0

2.3.3.0

If you set the subnet mask parameter with the value 0.0.0.0, RIP takes the

following actions:

• Since network 2.1.0.0 is on the the same network as the receiving interface

2.2.2.2, IP applies the subnet mask of the receiving interface to the destination

address. In this case, RIP adds the address/mask pair 2.1.0.0/255.255.0.0 to

the routing table.

• Since network 3.0.0.0 is on a different natural network than the receiving

interface, IP applies the natural mask of this network to the destination

address. In this case, RIP adds the address/mask pair 3.0.0.0/255.0.0.0 to the

routing table.

• Since network 2.3.3.0 is also on the same network as the receiving interface

2.2.2.2, RIP applies the mask of the receiving interface to the destination

address and adds the address/mask pair 2.3.0.0/255.255.0.0 to the routing

table.

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