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Notable Replies

  1. Hi Rene,
    1st of all thank you for all of your precious writings.

    I started reading your BGP blog. But im struggling to find an easy way to start with BGP. Because topics are scattered all over the place. Can't figure out which topics I should read first. Can you please help and show me the correct order that i should follow to become a BGP guru.

    Thank you

  2. Hi Rene,
    Nice lessons on BGP !!
    Three questions.
    1. What is the significance of 32768 in the o/p given below for the local route?
    2. When will metric be non-zero for a given route in bgp?
    3. Is there a way to change the default admin distance of e BGP from 20 to a different value ?
    I believe admin distance is used to compare alternate paths for a given prefix from multiple sources ( directly connected, static, ospf etc..)
    Will I be able to change the order of priority for these sources for a given prefix?

    Emma#show ip bgp 
    BGP table version is 3, local router ID is
    Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
                  r RIB-failure, S Stale
    Origin codes: i - IGP, e - EGP, ? - incomplete
       Network          Next Hop            Metric LocPrf Weight Path
    *>                  0         32768 i
    *>             0             0 2 i
  3. Hi Ganesh,

    The 32768 is the weight, which is the maximum value. Weight is a Cisco proprietary BGP attribute that is on top of the list. The prefix is advertised on this router so that's why you see the maximum weight value and a next hop of

    The metric can be changed with a route-map, here's an example:


    The administrative distance can be changed yes, we use the AD when you have multiple sources advertising the exact same prefix:


    BGP allows fine control of choosing which prefixes you want to use, take a look at the "BGP Attributes" on this page:



  4. Hey Rene,

    I was trying to use the loopback address on R1 to built IBGP with R2 and EBGP with R3 also. I tried but it is not working. Can we do like this??

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