a3 is a very basic bpg assignment.  - due in 2 weeks

BGP routing 

Do not run OSPF for any of the following.  Only run BGP.

1.1 setup a basic BGP mesh using exterior BGP and 4 AS (100, 101, 102, 103)
on dexter/radia/tony/mrhorse.  Originate a default route from dexter.

	Show your default routing table at tony and dexter.  

	Show the path database at tony and dexter.  (Examine it at
		all 4 routers though).

	btw: show the path database (the *RIB*) with this command:
	# show ip bgp

	what are the important bgp commands for Cisco bgp?

	tony has two ways to dexter.  which path did tony choose
		to get to dexter and the Inet?

1.2 break the link that is actually giving tony access to the Internet.
	how long does convergence take?  

	why did convergence take so long?

	how does tony's routing table change?

	what protocol messages were sent by BGP when you broke the
		connection?  (try and use tcpdump to capture at least one of them).

1.3 now implement an IBGP setup.  You design the configuration.  You may
	use as many routers as you want (show your design).
	Make sure that every router in your design can reach the default/Internet
	path.

2. implement at least 1 trick with BGP in which you design a mesh and set up
the mesh so that BGP routing is dependent on 1 BGP attribute (e.g., community or MED).
Show your network, explain your experiment, and your results. 

Optional work:

1. BGP can have a md5-based checksum authentication form.  How
is this implemented? 

2. in question 1.3 you are asked to setup IBGP sans an IGP.  
Try designing a network that has at least one interior router in the IGP that
is not a border router.  Run OSPF in your IGP/AS as your IGP.
Now turn synchronization on and see how routing works.  Now turn it back off
and see how routing works.  What observations can you make about what happened?