Extreme Networks ExtremeWare XOS 10.1, Manual

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BGP Communities
ExtremeWare XOS 10.1 Concepts Guide 205
BGP Communities
A BGP community is a group of BGP destinations that require common handling. ExtremeWare XOS
supports the following well-known BGP community attributes:
•
no-export
• no-advertise
• no-export-subconfed
BGP Features
This section describes the following BGP features supported by ExtremeWare XOS:
•
Route Reflectors on page 205
• Route Confederations on page 207
• Route Aggregation on page 211
• Using the Loopback Interface on page 211
• BGP Peer Groups on page 211
• BGP Route Flap Dampening on page 212
•
BGP Route Selection on page 213
• Route Re-Distribution on page 214
• BGP Static Network on page 215
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 or sub-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 38.