Avaya Configuring IP Services Manual de usuario Pagina 208

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Configuring IP Services
5-4
Configuring BGP on the Router
BGP communicates with BGP speakers in other routers through BGP interfaces to
attached networks. The router runs BGP on every slot that is configured with IP.
Selecting the BGP Version
Bay Networks supports BGP-3 and BGP-4. BGP-3 assumes that each advertised
network is a natural class network (A, B, or C) based on its high-order bits.
BGP-3 cannot advertise subnets or supernets. In contrast, BGP-4 has no concept
of address classes. Each network listed in the Network Layer Reachability
Information (NLRI) portion of an Update message contains a prefix length field,
which describes the length of the mask associated with the network. This allows
for both supernet and subnet advertisement. The supernet advertisement is what
makes classless interdomain routing (CIDR) deployment possible.
Establishing a Peer-to-Peer Connection
A BGP speaker forms neighbor relationships with other BGP speakers. This
happens when a BGP speaker establishes a TCP connection to a BGP peer (which
is simply the BGP speaker at the other end of the connection), based on local
configuration information.
For information on using Site Manager to configure BGP, see “Configuring BGP on the
Router” on page 5-25. For instructions on using Site Manager to customize the way BGP
runs on the router, see “Editing BGP Global Parameters” on page 5-28.
Site Manager allows you to select BGP-3 or BGP-4 (or both) to run on the router. For
instructions, see “Editing BGP-3 Global Parameters” on page 5-34 and “Editing BGP-4
Global Parameters” on page 5-35.
Site Manager allows to you specify the way a BGP speaker establishes and maintains a
peer-to-peer relationship with another BGP speaker. For instructions, see “Configuring a
BGP Peer Relationship” on page 5-36.
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