Bgp Features; Route Reflectors - Extreme Networks ExtremeWare XOS Guide Manual

BGP Features

This section describes the following BGP features supported by ExtremeWare XOS:
Route Reflectors on page 399
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Route Confederations on page 401
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Route Aggregation on page 404
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Using the Loopback Interface on page 404
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BGP Peer Groups on page 404
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BGP Route Flap Dampening on page 405
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BGP Route Selection on page 407
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Route Redistribution on page 408
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BGP Static Network on page 408
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Route Reflectors

Another way to overcome the difficulties of creating a fully meshed AS is to use route reflectors. Route
reflectors allow a single router to serve as a central routing point for the AS.
A cluster is formed by the route reflector and its client routers. Peer routers that are not part of the
cluster must be fully meshed according to the rules of BGP.
A BGP cluster, including the route reflector and its clients, is shown in
Figure 63: Route reflectors
1.1.1.1
Non-client
The topology shown in Figure 63
using route reflectors.
In this example, although the BGP speakers 3.3.3.3 and 4.4.4.4 do not have a direct BGP peering session
between them, these speakers still receive routes from each other indirectly through 2.2.2.2. The router
ExtremeWare XOS 11.1 Concepts Guide
AS 100
10.0.0.1
2.2.2.2
10.0.0.2
Route Reflector
minimizes the number of BGP peering sessions required in an AS by
Figure 63.
20.0.0.1
Client
20.0.0.2
30.0.0.2
30.0.0.1
Client
Cluster
BGP Features
3.3.3.3
4.4.4.4
EX_042
399