Allied Telesis AT-8100 Series - Manual (Page 1817)

AT-8100 Switch Command Line User’s Guide
1817
Routing Information Protocol (RIP)
The switch supports Routing Information Protocol (RIP) versions 1 and 2.
The protocol allows the switch to learn routes to remote destinations by
sharing the contents of its routing table with its neighboring routers in the
network.
RIP is a fairly simple distance-vector routing protocol that defines networks
based on the number of hops that are from the switch. A network that is
more than fifteen hops away (one hop is one link) is considered as
unreachable and is not included in the routing table.
RIP version 2 permits the addition of subnet masks and next-hop
information in RIP updates. This allows the use of different sized subnet
masks on different networks within the same classful network.
RIP advertisements are automatically activated when the protocol is
added to a routing interface on the switch. An interface sends RIP packets
to the RIP multicast address 224.0.0.9 when sending version 2 packets or
uses the broadcast address when sending out version 1 packets.
A route is propagated by RIP if its status at the physical level is active. An
active route has at least one active port in the VLAN. RIP does not
propagate an inactive route where there are no active ports in the VLAN.
RIP can be added to a maximum of 100 interfaces on the switch, and the
route table can store up to 1024 dynamic routes.
Since the interfaces on the switch can route packets among the local
networks without the presence of RIP or static routes, the routing protocol
is only necessary if the switch needs to learn remote destinations by
sharing the switch’s routing table with the neighboring routers, and you
choose not to specify the routes manually with static routes.
A route learned by RIP is immediately added to the routing table, where it
becomes available to all the interfaces on the switch.
When you add RIP to an interface, you can specify the type of RIP packets
the routing protocol is to send and receive. The switch can send either
version 1 or 2 packets and accept either or both versions.
Version 2 supports the addition of a password of up to sixteen
alphanumeric characters. The password is used by the routers to check for
bogus routing update packets. The switch adds the password into the
routing table when it broadcasts the contents of the table to its neighboring
routing devices, which check the password prior to updating their tables.