AddPac VoiceFinder AP2120 User's Guide Page 84

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VoiceFinder AP2120 VoIP Gateway User’s Guide Version 1.00
AddPac Technology Co., Ltd. -
84 -
4.5.2. RIP Configuration
RIP(Routing Information Protocol) is a well-known IGP(Interior Gateway
Protocol), which is relatively old but, still generally used. RIP is used for a
small-sclae and Homogeneous (with single Subnet Mask) network. RIP uses
Distance-Vector and is described at RFC 1058.
RIP uses UDP (User Datagram Protocol) Broadcast to exchange routing
information and VoiceFinder AP2120 Gateway sends rouing information at
every 30 sec. If a Gateway cannot receive update packet in 180 sec. from
the othe Gateway, it recognizes the Gateway is not operable and deletes from
the rouing table in 240 sec.
RIP uses Hop-Count as Metric (values to indicate the difference of paths to the
certain destination). Hop-Count marks as number of Gateways to pass over the
route. The Metrix of directly connected Gateway is “0” and the max. Metrix is
“15”. (If Metric is ‘16”, it is recognized as “Unreachable” network). Due to this
characteristic, RIP is not suitable for a large-scale network.
RIP sends Update to the interface designated by the operator. If RIP is not
configured at the certain interface, RIP update is not sent to the interface. So
to use RIP, configure RIP to the interface.
There is difference between RIP Version 2 and RIP Version 1. RIP v2 supports
VLSM (Variable Length Subnet Mask) and can support Heterogeneous network.
Also, RIP v2 uses Multicast for routing Update.
Information
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