Avaya Configuring IP Services Instrukcja Użytkownika Strona 126

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Configuring IP Services
3-4
Receiving RIP Updates
RIP can receive both RIP Version 1 and RIP Version 2 updates. A RIP Version 2
update message includes a subnet mask along with the destination address. A RIP
Version 1 update message contains the destination address only.
To determine the subnet address part and the host address part of a 32-bit IP
address, RIP examines the version number field of each incoming RIP update.
If the update is a Version 1 update, RIP applies the network mask assigned to
the address of the receiving IP interface to determine the destination subnet.
(If the receiving IP interface is an unnumbered interface, RIP applies the mask
of the associated IP address.) After applying the interface mask to the
destination, RIP looks at the remaining host portion of the address. If there are
any bits set in the host portion, this entry will be interpreted as a host address
and a mask of all 1s is used.
If the update is a Version 2 update, RIP applies the mask in the update to the
destination address. Support for variable-length subnets, supernetting, and
host routes (addresses) is implicit because of the support for subnet masks in
the Version 2 update.
Calculating the RIP Metric
To calculate the RIP metric for a received route, the router adds the configured
interface cost to the received RIP metric. The router enters this new value in the
routing table and uses it for subsequent RIP update transmissions.
Specifying a Subnet Mask for a Received Version 1 Update
A RIP Version 1 update does not include a subnet mask for a destination address.
By default, when RIP receives a Version 1 update, it applies the network mask
assigned to the address of the receiving IP interface. RIP adds this address/mask
pair to the routing table.
For instructions on using Site Manager to configure the cost of an interface, see the
Interface Cost parameter on page 2-38.
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