BGP Study Notes

Path Vector protocol, uses TCP/179 as transport.
EBGP Routes have AD of 20, IBGP have 200.

BGP Syncronization Rule: Don't use or propagate a route learned by IBGP, that is not also known by another source. (an IGP)

3 Tables: BGP Forwarding, BGP Neighbor, Routing tables.

Message Types:
Open, sent to establish adj. A keepalive is sent for confirmation.
Keepalive; sent in 60 second intervals.
Update
Notification; sent in response to errors/special conditions

Neighbor States:
Idle
Connect
Open Sent
Open Confirm
Established

Attributes:
Origin
AS-Path
Next-Hop
MED
Local Pref.
Community

Commands:
Hard/soft(w/o flap) reset
# clear ip bgp {* | address}[soft [in | out]]

Send MD5 hashed password w/ every packet
# neighbor ip-address password password