Cabletron Systems CyberSWITCH CSX500 Specifications download pdf (Page 143)

Routing Configuration Window

QuickSET Configuration Guide 127

Routing Information Protocol Options

The following options are available in the Modify RIP panel:

Do Not Send — do not send any Routing Information Protocol packets from this interface.

Do Not Receive — do not allow any Routing Information Protocol packets to be received by this

interface.

RIP Version 1 — only RIP-1 messages are (sent/received). RIP-1 does not allow subnet

addressing and does not use authentication.

RIP-1 Compatible — a RIP-2 mode in which RIP-2 messages are broadcast and multicast. RIP-1

messages and unauthenticated RIP-2 messages can be accepted.

RIP-2 — allows sending and receiving of RIP-2 messages, authenticated RIP-2 messages, allows

subnet addressing, and IP Multicasting.

RIP-1 vs. RIP-2

A comparison of the features of RIP-1 and RIP-2 protocols (excerpted from RFC 2453, Copyright,

The Internet Society, 1998) follows:

RIP-2 is essentially an extension of RIP-1 - it is not a new protocol. It is a superset of the

environments in which RIP-1 has been traditionally used. It should be noted that RIP-2 is not

intended to be a substitute for OSPF (Open Shortest Path First) protocol in large autonomous

systems. The restrictions on autonomous system diameter and complexity which applied to RIP-1

also apply to RIP-2.

Subnet Masks

RIP-2 allows the smaller, simpler, distance-vector protocol to be used in environments which

require authentication or the use of variable length subnet masks, but are not of a size or

complexity which require the use of the larger, more complex link-state OSPF protocol.

The original impetus behind the creation of RIP-2 was the desire to include subnet masks in the

routing information exchanged by RIP, as this was not included in the original deﬁnition of RIP. As

long as the subnet mask was ﬁxed for a network, and well known by all the nodes on that network,

a heuristic could be used to determine if a route was a subnet route or a host route.

The inclusion of the subnet mask in RIP-2 effectively creates a 64-bit address which eliminates the

network, subnet, and host distinction. Therefore the inclusion of a subnet mask in RIP-2 allows it

to be used in an autonomous system which requires precise knowledge of the subnet mask for a

given route, but does not otherwise require OSPF protocol.

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Cabletron Systems CyberSWITCH CSX500 Specifications Page 143