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WAN - 07 BGP, Switching types, Routing - Coggle Diagram
WAN - 07
BGP
States
Idle
Tries to initialize a TCP connection
Listens for incoming connections
Connect
Waits for the TCP Connection Completion.
Router with the higher IP Address manages the connection.
Active
Starts TCP Connection with peer.
OpenSent
Routers perform sanity checks
OpenConfirm
Keepalive
Every 60 seconds
Default hold 180 seconds.
Established
Info
Exterior Gateway Protocol
Forms neighborships
Neighbor IP is explicitly configured.
A TCP session is configured between the routers.
A Path vector routing protocol
RFC 4271
Path Selection Configuration
Weight
Not advertised to others.
To influence the traffic
Local Preference
Specify optional AS.
Shortest AS Path
Origine type
Prefix
Multi-exit discriminator
Advantages
Route Stability
Path Vector Protocol
Concerned about the number of autonomous systems to reach a destination.
Uses AS path to detect routing loops.
AS
Definition
AS Numbers
Assigned by
Internet Assigned Numbers Authority
Public
1 - 64511
Private
64512 - 64534
Switching types
Cisco Express Forwarding
(CEF)
The default
Query IP Routing table directly.
High CPU Utilization
Fastest
More Advanced
Process Switching
The oldest & basic.
Every backet is directly handled by CPU & looking routing table
Slow Performance
Resource Intensive
Fall-back method when other methods fails.
Outputs
The physical interface the packet go out.
The next hop address
Fast Switching
Uses IP routing table. Then stores it in Cache.
Routing
Routing Considerations
Administrative Distance
BGP --> 20
IP Route Table
Switching Process
Modifications
Metrics
Route Types
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