Exchange Of Routing Information; Rip Route Summarization; Split Horizon Mechanism - Fujitsu PSWITCH 2048T User Manual

User's Guide FUJITSU PSWITCH
This product supports two authentication modes: RIP-enabled interface and
plaintext authentication and message digest algorithm 5 (MD5 authentication).
Plain text authentication is the default authentication for all RIPv2 packets.

3.1.9.14.2. Exchange of Routing Information

The Routing Information Protocol (RIP) is usually a broadcast protocol, and the RIP
routing update needs to configure the software to allow exchange of this routing
information in order to reach the nonbroadcast network.
To control the set of interfaces that exchange routing updates, configure the
passive - interface router configuration command so that it does not send routing
updates on the specified interface.
In addition, the address family can have a timer that is explicitly applied to that
address family. The timers basic command must be specified in the address family.
Or, the system default of the timers basic command is used regardless of the timer
configured for RIP routing.

3.1.9.14.3. RIP Route Summarization

By aggregating RIP version 2 routes, scalability and efficiency of large scale
networks are improved. Aggregating the IP address means that there is no entry
for the child route (route created for any combination of individual IP addresses
included in the summary address) in the RIP routing table, the size of the table
becomes smaller. This means that the router will be able to handle more routes.
When RIP determines that an aggregate address is required for the RIP database, a
summary entry is created in the RIP routing database. As long as there is a child
route of the aggregate address, the address remains in the routing database.
When the last child route is deleted, the summary entry is also deleted from the
database. In this way of handling database entries, the number of entries in the
database decreases as each child route is not listed in the entry, and the
aggregation entry itself is deleted when there are no valid child routes.

3.1.9.14.4. Split Horizon Mechanism

Devices that are typically connected to a broadcast IP network and that use
distance vector routing protocols use the split horizon mechanism to reduce the
possibility of routing loops. If Split Horizon is enabled, the received route
information will not be advertised to the device from which the information was
sent. This behavior usually optimizes communication between multiple devices.
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