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Notable Replies

  1. First of Congratulation Rene...for ur CCIE Number.. U deserve it. The lab u post & the way u write article in most simple form is simply amazing. Why don't u start writing books for CCIE R&S TS.. I would love to hv one in my collection. Wish u all the success. I m a fan of ur blog who is chasing the dream of CCIE R&S.

  2. thanks it so hard to get any information when your studying for a ccnp all by yourself and I'm not in an i.t. job yet keep up the good work

  3. Hi Kandhla,

    It's up to the network engineers / ISPs but there is one key difference between AS path prepending and MED:


    • When you use AS path prepending, it will show up at your neighbor AS and all other ASes behind them.

    • When you use MED, it will show up at your neighbor but NOT at any AS behind them.

    Rene

  4. Hi Rene

    Does MED distributed to other routers within same AS? I have mpls cloud provided by Verizon, Verizon AS 65000,
    my office1 in Houston AS 65400 has two routers, router1 and router2, each has a mpls connections to Verizon , router2 is backup and configure MED 10.
    my office2 is in Sanfrancisco AS 65401. sometimes I have some unexplained network issue, connectivity from Sanfrancisco to Houston.
    I wonder if MED is the issue not being distributed to all Verizon routers in the mpls cloud and cause asymmetric routing, I am thinking changing MED to AS Path Prepend on Houston router2.

    thank you

    Hoan

  5. Errata:
    MED (also called metric) is exchanged between autonomous systems and you can use it to let the other AS know which path they should use to enter your AS. R2 is sending a MED of 200 towards AS 3. R3 is sending a MED of 300 to AS 3. AS 3 will prefer the lower metric and send all traffic for AS 1 through AS 1. <------- R2

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