Hello,
I would like to know if ( as a network admin) one should configure external routes coming from outside the Autonomous system as External Type 1 or 2. I am very well acquainted with the facts and concepts of both i.e ( E1 adds up the cost toward the destination and E2 has a default cost of 20).
What i ought to know is if there is any othe benefit in using E1 than E2 apart from the Cost ? Do we actually use it in Real World scenarios. If so, then (perhaps who has actually implemented it allready) , what is the spark whcih ignites the thought of implementing E1 instead of E2. Does it help in Troubleshooting or selecting a path as in like Multihomed adjacencies ?
Anybody with some practical examples here to clear the need of E1's ?
Thanks
J
Correct Answer
E2s have a default metric of 20 and it will never change/increment along a path. While E1s come in with 20 by default as well, they will add metrics at each hop, making them easier to manipulate along with internal routing paths.
Personally, I always do E1s. But in a lab environment (or consulting) you do whatever you are told to do. 
Scott
