Video Notes: Intro to Dynamic Routing - Hsanokklis/2022-2023-Tech-journal GitHub Wiki

https://youtu.be/h9RjHPeDBC0

Intro to Dynamic Routing Notes:

Routing Tables

At minimum a router table needs to have:

  • Network address

The address of the network

  • Subnet mask

The subnet mask for that network so it knows how many bits in the net ID

  • Next hop

IP address of a neighboring router it can send the packet to reach the network

  • Interface

Which of the routers own physical interfaces it can send the packet out of to reach the next hop

image

image

image

Static

  • Network admins can type them into the router config

Ex: ip route 192.168.4.0 255.255.255.0 192.168.3.2 FA0/1

  • Does not scale well, meant for small networks

Dynamic

  • Automatic
  • The router will build the routers
  • Use protocols so that the routers can send routing table information to their neighbors
  • Allows for network admins to build out bigger networks without having to remember all the routes
  • Allows the routers to talk to each other

Routing Protocols

  • A set of rules that a system must follow
  • Routers use the protocols to send packets to one another about networks and how to access them
  • routers use the info to build their routing tables

Routing Information Protocol

  • With static routing you have to manually input the RIP into each router

image

Interior Gateway Protocol (IGP)

  • Used to refer to the process running on routers inside an organization's network
  • Protocols you can use within your network
  • Such as Champlain college, you can use Skiff, Foster, Joyce, The library
  • Carries information about internal infrastructure prefixes
  • RIPv2
  • OSPF
  • ISIS

Exterior Gateway Protocol (EGP)

  • Used to refer to the process running between routers bordering directly connected ISP networks

  • when information is going form Champlain's network out to the world

  • Uses protocols that can carry larger information to larger distances

  • BGP(Border gateway protocol)

  • Helps with scaling

  • Gives definite administrative boundaries(you know google from amazon)

  • connects multiple IGPs together

image

Why would your inside network need different protocols then your outside network