Cabletron Systems SSIM-R8-02 Specifikace stáhnout pdf (Strana 173)

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101

Enterasys Xpedition User Reference Manual 153

BGP Configuration Examples

• BGP Multi-Exit Discriminator (MED) attribute

• EBGP aggregation

• Route reflection

BGP Peering Session Example

The router process used for a specific BGP peering session is known as a BGP speaker. A

single router can have several BGP speakers. Successful BGP peering depends on the

establishment of a neighbor relationship between BGP speakers. The first step in creating

a BGP neighbor relationship is the establishment of a TCP connection (using TCP port

179) between peers.

A BGP Open message can then be sent between peers across the TCP connection to

establish various BGP variables (BGP Version, AS number (ASN), hold time, BGP

identifier, and optional parameters). Upon successful completion of the BGP Open

negotiations, BGP Update messages containing the BGP routing table can be sent between

peers.

BGP does not require a periodic refresh of the entire BGP routing table between peers.

Only incremental routing changes are exchanged. Therefore, each BGP speaker is required

to retain the entire BGP routing table of their peer for the duration of the peer’s

connection.

BGP “keepalive” messages are sent between peers periodically to ensure that the peers

stay connected. If one of the routers encounters a fatal error condition, a BGP notification

message is sent to its BGP peer, and the TCP connection is closed.

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