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CHAPTER 11: BGP (Path Attributes (Well-Known Mandatory (AS_Path, Origin,…
CHAPTER 11:
BGP
Path Attributes
Well-Known Mandatory
AS_Path
Origin
Next-Hop
Well-Known Discretionary
Atomic Aggregate
Local Preference
Optional Transitive
Optional Non-Transitive
MED
Network Layer Reachability Information
Network Prefix
Prefix Length
BGP PAs
Inter-Router Communication
TCP Port 179
BGP Session Types
iBGP
eBGP
BGP Packet Types
OPEN
Hold-Time (Default 180s)
BGP RID (32-bit)
KEEPALIVE (Default 60s)
NOTIFICATION
UPDATE
BGP Neighbor States
Idle
Connect
Active
OPENSent
OPENConfirm
Established
Route Tables
Loc-RIB
Adj-RIB-In
Adj-RIB-Out
Autonomous System Numbers
2-byte range: Private - 64512 - 65,535
4-byte: Private - 4,200,000,000 - 4,294,967,294
Summarization
aggregate-address
command
summary-only
as-set
Atomic Aggregate Attribute