ZyXEL Communications Prestige 861H-G1, User Manual

Page: 63 / 275

Prestige 861H User’s Guide
LAN Setup 6-3
♦ Both
- the Prestige will broadcast its routing table periodically and incorporate the RIP
information that it receives.
♦ In Only
- the Prestige will not send any RIP packets but will accept all RIP packets received.
♦ Out Only
- the Prestige will send out RIP packets but will not accept any RIP packets
received.
♦ None
- the Prestige will not send any RIP packets and will ignore any RIP packets received.
The Version field controls the format and the broadcasting method of the RIP packets that the Prestige
sends (it recognizes both formats when receiving). RIP-1 is universally supported; but RIP-2 carries
more information. RIP-1 is probably adequate for most networks, unless you have an unusual network
topology.
Both
RIP-2B
and
RIP-2M
sends the routing data in RIP-2 format; the difference being that
RIP-2B
uses subnet broadcasting while RIP-2M uses multicasting.
6.4.4 Multicast
Traditionally, IP packets are transmitted in one of either two ways - Unicast (1 sender - 1 recipient) or
Broadcast (1 sender - everybody on the network). Multicast delivers IP packets to a group of hosts on
the network - not everybody and not just 1.
IGMP (Internet Group Multicast Protocol) is a network-layer protocol used to establish membership in
a Multicast group - it is not used to carry user data. IGMP version 2 (RFC 2236) is an improvement
over version 1 (RFC 1112) but IGMP version 1 is still in wide use. If you would like to read more
detailed information about interoperability between IGMP version 2 and version 1, please see sections
4 and 5 of RFC 2236. The class D IP address is used to identify host groups and can be in the range
224.0.0.0 to 239.255.255.255. The address 224.0.0.0 is not assigned to any group and is used by IP
multicast computers. The address 224.0.0.1 is used for query messages and is assigned to the
permanent group of all IP hosts (including gateways). All hosts must join the 224.0.0.1 group in order
to participate in IGMP. The address 224.0.0.2 is assigned to the multicast routers group.
The Prestige supports both IGMP version 1 ( IGMP-v1 ) and IGMP version 2 ( IGMP-v2 ). At start up,
the Prestige queries all directly connected networks to gather group membership. After that, the
Prestige periodically updates this information. IP multicasting can be enabled/disabled on the Prestige
LAN and/or WAN interfaces in the web configurator (
LAN ; WAN ). Select None to disable IP
multicasting on these interfaces.
6.5 Configuring LAN
Click LAN and LAN Setup to open the following screen.