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  1. #1
    Join Date
    May 2011
    Location
    Middlesbrough, UK
    Posts
    88

    Default 7th Edition - Page 312 regarding CDP

    Hi all,

    I'm reviewing the CDP sections in the 7th edition. Working on Figure 7.2, which shows how to map the IP addresses of the routers around the main router via CDP commands. The problem I have is on Page 313, near the bottom when it shows the output from the "Show CDP Neighbors" command.

    This command shows the type of routers around the main router, and what interface they are on. However the book then assumes that because an interfaces IP address is 192.168.21.1, then the other side would be 192.168.21.2 (aka 1 ip up). Surely assuming this IP address could be dangerous, or is there something else in the text that suggests this is how the network is configured?

    From another angle, the top section of Page 314 states "we can now create the topology in Figure 7.3". You can, but not the IP addresses of the remote routers?

  2. #2
    Join Date
    Aug 2009
    Location
    California, US
    Posts
    115

    Default

    Show cdp neighbors detail will give you the ip address

  3. #3
    Join Date
    Mar 2008
    Posts
    2,888

    Default

    Quote Originally Posted by DonB View Post
    Show cdp neighbors detail will give you the ip address
    Show cdp neighbor details
    Maddox Thomas-Clark 14/10/2008
    Bean Thomas-Clark 18/09/2007
    Big Evils Cisco World
    Linkedin

  4. #4
    Join Date
    Dec 2006
    Posts
    2,191

    Default

    Certainly show cdp neighbors detail will give us that information, and Cisco wants you to know that (you can also use "show cdp entry *), but we can also assume in this question as these are point to point links, so the address is typically the next one in the host range.
    Todd

  5. #5
    Join Date
    May 2011
    Location
    Middlesbrough, UK
    Posts
    88

    Default

    Cheers Todd, thats what I was hoping would be the answer.

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