Cisco CCNP / BSCI Certification: The BGP Attribute MED - 0 views

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  #1 Laustsen Hoyle on 17 Sep 13

   

  When you're getting ready to go the BSCI assessment and make your CCNP certification, one of the biggest challenges is understanding BGP. This great phlobomity classes essay has oodles of poetic lessons for the meaning behind it. BGP is completely different from any protocol you learned to earn your CCNA certification, and one of the differences is that BGP uses path attributes to like one path over yet another when multiple routes to or from a destination exist.
  
  Notice I said "to or from." In earlier in the day free BGP courses, I mentioned the BGP capabilities "weight" and "local preference." These attributes are employed to favor one path to a destination over another; as an example, if BGP AS 100 has two routes to a in AS 200, these two attributes may be emerge AS 100 to favor one path over yet another. But imagine if AS 100 desires to advise the routers in AS 200 regarding which path it will use to achieve a given spot in AS 100?
  
  That's where the BGP characteristic "Multi-Exit Discriminator", or MED, is available in. The MED value may be set in AS 100 to share with AS 200 which way it should use to reach certain network in AS 100.
  
  As with many BGP capabilities, the MED may be established with a route-map. Things you need to look at is that there's no "set med" worth in route maps. You'll need to change the metric of this path, to change the MED of a path. Let's say that we now have two entry trails for AS 200 to make use of to achieve destinations in AS 100. Clicking the phlebotomist pay scale seemingly provides suggestions you might tell your friend. You would like AS 200 to use the 100.1.1.0/24 path on the 100.2.2.0/24 path. Dig up supplementary information on a partner encyclopedia by visiting how to become a phelbomist. First, determine the two routes with two separate ACLs.
  
  R1( config )#access-list 22 enable 100.1.1.0 0.0.0.255
  
  R1( config )#access-list 23 let 100.2.2.0 0.0.0.255
  
  Next, create a route-map that assigns a lowered full to the more-desirable route.
  
  R1( config )#route-map PREFER_PATH let 10
  
  R1( config-route-map )#match ip 22
  
  R1( config-route-map )#set metric 100
  
  R1( config-route-map )#route-map PREFER_PATH enable 20
  
  R1( config-route-map )#match internet protocol address 23
  
  R1( config-route-map )#set full 250
  
  Finally, apply the route-map to the neighbor or neighbors.
  
  R1( config-route-map )#router bgp 100
  
  R1( config-router )#neighbor 22.2.2.2 route-map PREFER_PATH out
  
  The important thing points to bear in mind is that while a higher value is preferred by many BGP attributes, the MED is basically an metric - and less metric is advised, just as with the methods you've already studied to make your CCNA certification. Browsing To the best perhaps provides cautions you could give to your uncle.Chris Wallace
  Medical-Assistant-Training.org
  San Francisco, CA 94105
  575 Market Street, Suite 3000
  (415) 209-5257

   

  <div class="cArrow"> </div><div class="cContentInner">When you're getting ready to go the BSCI assessment and make your CCNP certification, one of the biggest challenges is understanding BGP. This great <a rel="nofollow" href="http://howtobecomeaphlebotomist.com/phlebotomy-classes.php">phlobomity classes</a> essay has oodles of poetic lessons for the meaning behind it. BGP is completely different from any protocol you learned to earn your CCNA certification, and one of the differences is that BGP uses path attributes to like one path over yet another when multiple routes to or from a destination exist. <br /> <br /> Notice I said "to or from." In earlier in the day free BGP courses, I mentioned the BGP capabilities "weight" and "local preference." These attributes are employed to favor one path to a destination over another; as an example, if BGP AS 100 has two routes to a in AS 200, these two attributes may be emerge AS 100 to favor one path over yet another. But imagine if AS 100 desires to advise the routers in AS 200 regarding which path it will use to achieve a given spot in AS 100? <br /> <br /> That's where the BGP characteristic "Multi-Exit Discriminator", or MED, is available in. The MED value may be set in AS 100 to share with AS 200 which way it should use to reach certain network in AS 100. <br /> <br /> As with many BGP capabilities, the MED may be established with a route-map. Things you need to look at is that there's no "set med" worth in route maps. You'll need to change the metric of this path, to change the MED of a path. Let's say that we now have two entry trails for AS 200 to make use of to achieve destinations in AS 100. Clicking <a rel="nofollow" href="http://www.howtobecomeaphlebotomist.com/">the phlebotomist pay scale</a> seemingly provides suggestions you might tell your friend. You would like AS 200 to use the 100.1.1.0/24 path on the 100.2.2.0/24 path. Dig up supplementary information on a partner encyclopedia by visiting <a rel="nofollow" href="http://howtobecomeaphlebotomist.com/">how to become a phelbomist</a>. First, determine the two routes with two separate ACLs. <br /> <br /> R1( config )#access-list 22 enable 100.1.1.0 0.0.0.255 <br /> <br /> R1( config )#access-list 23 let 100.2.2.0 0.0.0.255 <br /> <br /> Next, create a route-map that assigns a lowered full to the more-desirable route. <br /> <br /> R1( config )#route-map PREFER_PATH let 10 <br /> <br /> R1( config-route-map )#match ip 22 <br /> <br /> R1( config-route-map )#set metric 100 <br /> <br /> R1( config-route-map )#route-map PREFER_PATH enable 20 <br /> <br /> R1( config-route-map )#match internet protocol address 23 <br /> <br /> R1( config-route-map )#set full 250 <br /> <br /> Finally, apply the route-map to the neighbor or neighbors. <br /> <br /> R1( config-route-map )#router bgp 100 <br /> <br /> R1( config-router )#neighbor 22.2.2.2 route-map PREFER_PATH out <br /> <br /> The important thing points to bear in mind is that while a higher value is preferred by many BGP attributes, the MED is basically an metric - and less metric is advised, just as with the methods you've already studied to make your CCNA certification. Browsing To <a rel="nofollow" href="http://howtobecomeaphlebotomist.com/phlebotomist-salary.php">the best</a> perhaps provides cautions you could give to your uncle.Chris Wallace <br /> Medical-Assistant-Training.org <br /> San Francisco, CA 94105 <br /> 575 Market Street, Suite 3000 <br /> (415) 209-5257</div>

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