Release 1.0
Configuring BGP
526360-001-00 Rev. B
MGBI
12-5
BGP Updates
BGP routers exchange routing information in the form of BGP updates. BGP updates
contain the following attributes associated with routes that a BGP peer advertises to
its neighbors:
■
A list of ASs the routing update passed through
■
The AS routing update origin
■
Next hop information
■
Metrics specifying route preference
BGP Sessions
After exchanging a series of messages, the BGP peers establish a session over TCP.
BGP session partners rely on TCP to manage the underlying connection. Once a TCP
connection is established, a BGP router uses port 179 to communicate full routing
information with another BGP peer. As long as the connection is up, the BGP partners
can exchange a very simple set of messages with minimal overhead.
The BGP protocol includes the exchange of
keep-alive
messages between peers. A
keep-alive message is a signal from one endpoint to another, indicating that the first
end point is still active. Keep-alive messages are necessary to keep BGP peers aware
of the health of the connection, because TCP does not provide this service.
Specifications
The BSR supports the following Request for Comment (RFC) specifications:
■
RFC 1771 —
A Border Gateway Protocol 4 (BGP-4
)
■
RFC 1745 —
BGP4/IDRP for IP (OSPF Interaction)
■
RFC 1965 —
Autonomous System Confederations for BGP
■
RFC 1997 —
BGP Communities Attributes
■
RFC 1998 —
An Application of the BGP Community Attribute in Multi-home
Routing
■
RFC 2439 —
BGP Route Flap Damping
■
RFC 2385 —
Protection of BGP Sessions via the TCP MD5 Signature Options
Содержание BSR 2000
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