20/09/2017
BGP
- eBGP ad 20
- iBGP ad 200
- BGP uses TCP port 179
- Designed as an Exterior gateway Protocol.
- Advertises, learns, chooses best paths inside the internet.
- Only BGP can handle the large sum of routes (currently 650k in the ipv4 route table).
- Can be used for large enterprise networks where iGP can’t work.
- Uses a best-path algorithm.
- Chooses the best path using this algorithm.
- Best path selection based on multiple criteria.
- Only installs one route in the route table, unlike iGP where they will add multiple and loadbalance.
- Path-vector similair to distance vector, via path attributes.
- Scalability > fast convergence.
- NLRI ( Network Layer Reachablity Information ).
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