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Added introduction to BGP.

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Martin Mares 2000-05-29 13:47:18 +00:00
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@ -453,6 +453,35 @@ if 1234 = i then printn "."; else { print "*** FAIL: if 1 else"; }
<sect1>BGP
<p>The Border Gateway Protocol is the routing protocol used for backbone
level routing in today's Internet. Contrary to other protocols, its convergence
doesn't rely on all routers following the same rules for route selection,
making it possible to implement any routing policy at any router in the
network, the only restriction being that if a router advertises a route,
it must accept and forward packets according to it.
<p>BGP works in terms of autonomous systems (often abbreviated as AS). Each
AS is a part of the network with common management and common routing policy.
Routers within each AS usually communicate using either a interior routing
protocol (such as OSPF or RIP) or an interior variant of BGP (called iBGP).
Boundary routers at the border of the AS communicate with their peers
in the neighboring AS'es via exterior BGP (eBGP).
<p>Each BGP router sends to its neighbors updates of the parts of its
routing table it wishes to export along with complete path information
(a list of AS'es the packet will travel through if it uses that particular
route) in order to avoid routing loops.
<p>In BIRD, each instance of BGP corresponds to one neighboring router.
This allows to set routing policy and all other parameters differently
for each neighbor.
<sect2>Configuration
<sect2>Attributes
<sect2>Example
<sect1>Device
<p>The Device protocol is not a real routing protocol as it doesn't generate