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  1. #1
    Join Date
    Aug 2010
    Location
    El Cajon, California
    Posts
    38

    Default Hands on Lab 9-4 comment

    at the top of page 492 in seventh edition it sez "that if EIGRP is still enabled on the routers, you will not see any OSPF routes"

    But actually I do. Maybe I can get a comment on that: For example here's
    2501A (although I named it differently)

    O 172.16.30.1/32 [110/65] via 172.16.20.2, 00:11:40, Serial0/0
    MIDDLE_BOTTOM#s h ip ro
    Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
    D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
    N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
    E1 - OSPF external type 1, E2 - OSPF external type 2
    i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
    ia - IS-IS inter area, * - candidate default, U - per-user static route
    o - ODR, P - periodic downloaded static route
    Gateway of last resort is not set
    172.16.0.0/16 is variably subnetted, 7 subnets, 3 masks
    D 172.16.50.0/24 [90/2809856] via 172.16.20.2, 00:48:52, Serial0/0
    O 172.16.50.1/32 [110/129] via 172.16.20.2, 00:18:53, Serial0/0
    D 172.16.40.0/30 [90/2681856] via 172.16.20.2, 00:50:02, Serial0/0
    D 172.16.30.0/24 [90/2297856] via 172.16.20.2, 00:50:02, Serial0/0
    O 172.16.30.1/32 [110/65] via 172.16.20.2, 00:18:53, Serial0/0
    C 172.16.20.0/30 is directly connected, Serial0/0
    C 172.16.10.0/24 is directly connected, FastEthernet0/0

    and here's filtering the output:

    MIDDLE_BOTTOM#s h ip ro os
    172.16.0.0/16 is variably subnetted, 7 subnets, 3 masks
    O 172.16.50.1/32 [110/129] via 172.16.20.2, 00:19:55, Serial0/0
    O 172.16.30.1/32 [110/65] via 172.16.20.2, 00:19:56, Serial0/0
    MIDDLE_BOTTOM#

    the only thing I can see is the routes are installed because they are /32s

    Thanks

  2. #2
    Join Date
    Dec 2010
    Location
    Left Coast, California
    Posts
    306

    Default

    Quote Originally Posted by mikeyb View Post

    the only thing I can see is the routes are installed because they are /32s

    Thanks
    Interesting, if you do a clear ip route * - which forces the routing table to rebuild - and you still see those routes, then you would have to be correct.

    I'll see if I can do that up fast in PT.
    Kevin NET+SEC+A+CCNA
    'All that is not eternal is eternally out of date' ~ C.S. Lewis

  3. #3
    Join Date
    Dec 2010
    Location
    Left Coast, California
    Posts
    306

    Default

    I dont have the book Mikey, so I may be lacking details, but Im getting the same result.

    I have a loopback of 172.16.50.1/32 and the other routing tables give me an OSPF and EIGRP route of /32 and /24, respectively (with eigrp auto-summary on, or off, same result). Both protocols ON at the same time.


    I think you figured it out.
    Last edited by ciscodaze; 12-26-2011 at 09:30 PM.
    Kevin NET+SEC+A+CCNA
    'All that is not eternal is eternally out of date' ~ C.S. Lewis

  4. #4
    Join Date
    Dec 2010
    Location
    Left Coast, California
    Posts
    306

    Default

    Quote Originally Posted by ciscodaze View Post
    I dont have the book Mikey, so I may be lacking details, but Im getting the same result.

    I have a loopback of 172.16.50.1/32 and the other routing tables give me an OSPF and EIGRP route of /32 and /24, respectively (with eigrp auto-summary on, or off, same result). Both protocols ON at the same time.


    I think you figured it out.
    whoops, my mistake. I mistakenly advertised 172.16.50.1 as a /24 for eigrp...once I changed it to /32, like the 172.16.50.1/32 for ospf, then turned off eigrp, ospf popped in (whereas it was not there before).

    moral of the story: what you see in the routing table when running more than one protocol depends on the masks you use when doing your network statements (or, what gets advertised to that router from outside).

    The reason I saw routes for both routing protocols the first time (maybe why you did too) is that they were both valid, with the ospf /32 being more specific. So they both get installed -- even though eigrp wins (normally) with the AD of 90, ospf got installed with it because it had a more specific route (longest match rule).

    Once I gave them both /32, the AD tie-breaker kicked in and knocked ospf out, (until eigrp got turned off, allowing the ospf route to be installed as the best route).

    edit: looking at your output, thats exactly what happened:

    D 172.16.50.0/24 [90/2809856] via 172.16.20.2, 00:48:52, Serial0/0
    O 172.16.50.1/32 [110/129] via 172.16.20.2, 00:18:53, Serial0/0
    Last edited by ciscodaze; 12-27-2011 at 08:56 PM.
    Kevin NET+SEC+A+CCNA
    'All that is not eternal is eternally out of date' ~ C.S. Lewis

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