HP Routing Services -UX 11i v2 manual RIP Ospf

Overview

The gated Routing Daemon

Table 1-1	Comparison of RIP and OSPF Protocols (Continued)
	RIP	OSPF
	Disadvantage: RIP generates	Advantage: OSPF generates less
	more protocol traffic than OSPF,	protocol traffic than RIP,
	because it propagates routing	because (i) Each router
	information by periodically	transmits information only
	transmitting the entire routing	about its links instead of the
	table to neighbor routers.	whole routing table, and (ii)
		OSPF allows you to divide an
		autonomous system into areas,
		each with a designated router
		that exchanges inter-area
		routing information with other
		routers. Intra-area routing
		information is isolated to a
		single area.
	Disadvantage: RIP is not	Advantage: OSPF works well in
	appropriate for large networks,	large networks.
	because RIP packet size
	increases as the number of
	networks increases.

gated supports the following exterior gateway protocols:

•The External Gateway Protocol (EGP) permits a node on the NSFNET backbone to exchange information with other backbone nodes about reaching a destination. You can use EGP to communicate routing information between autonomous systems. The EGP protocol will be obsoleted in a future release of HP-UX. Use BGP instead of the EGP protocol. BGP offers more flexibility and requires less bandwidth than EGP.

•The Border Gateway Protocol (BGP) is intended as a replacement for EGP. BGP uses path attributes to select routes. One of the attributes that BGP can pass is the sequence of autonomous systems that must be traversed to reach a destination. gated supports BGP Versions 2, 3, and 4, as described in RFCs 1163 and 1267.

gated also supports the Router Discovery Protocol (RDP), which is neither an interior nor an exterior gateway protocol. RDP is used to inform hosts of the existence of routers to which the hosts can send

26 Chapter 1