29 BGP Configuration
The BGP (Border Gateway Protocol) is an EGP (Exterior Gateway Protocol) to communicate
with the routers of different autonomous systems, whose main function is to switch the
network availability information among different Autonomous Systems (AS) and eliminate
the routing lookback by the protocol mechanism itself.
The BGP takes the TCP protocol as the transmission protocol and ensures the transmission
reliability of the BGP by the reliable transmission TCP mechanism.
The router which operates the BGP protocol is referred to as the BGP Speaker, and the BGP
Speakers which set up the BGP session connection are referred to as the BGP Peers.
Two modes can be used to establish the BGP peers among BGP Speakers, such as IBGP
(Internal BGP) and EBGP (External BGP). The IBGP refers to establish the BGP connection
within the same AS, while the EBGP refers to establish the BGP connection among different
ASs. In a word, the function of two connections is that the EBGP is to switch the route
information among different ASs, while the IBGP is to carry out the transition of route
information within this AS.
The BGP protocol of this product presents such characteristics as follows:
BGP-4 Supported
Path Attribute Supported
ORIGN Attribute
AS_PATH Attribute
NEXT_HOP Attribute
MULTI_EXIT_DISC Attribute
LOCAL-PREFERENCE Attribute
ATOMIC_AGGREGATE Attribute
AGGREGATOR Attribute
COMMUNITY Attribute
ORIGINATOR_ID Attribute
CLUSTER_LIST Attribute
BGP Peer Groups Supported
Loopback Interface Supported
MD5 Authentication of TCP Supported
Synchronization of BGP and IGP Supported
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