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EIGRP network command and wildcard option

Discussion in 'Routing & Switching' started by Septima77, Feb 13, 2009.

  1. Septima77

    Septima77 Nibble Poster

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    I finished studying the Sybex CCNA book (5th edition) and completed all labs and just watched the CBTNuggets CCNA video's. The instructor shows how to configure EIGRP with wildcard bits, but this is not covered in the book and the option is not available in my RouterSim lab 6.0.
    Is this option only available in the newer routers?
    So,.... is it, or isn't it CCNA material? Can this be on the test?

    Another thing I noticed is that in my lab in which I have 3 networks: 3 routers on a stick with various VLANs. 1 network with 192.168.x.x addresses and 2 networks with 172.16.x.x addressing. When configured with eigrp, everything works and is pingable, but I don't see auto-summarization in my routing tables.

    I had the impression that is a feature of eigrp when using discontiguous networks.

    Details routers: IOS C2600 version 12.1(13)T1
     
    Certifications: CCNA CCNAS CCNAV
    WIP: CCVP
  2. Septima77

    Septima77 Nibble Poster

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    I was a little impatient looking at the routing table and the routers took a bit of time to converge

    R_Core>en
    R_Core#sh ip route

    Codes: C - connected, S - static, I - IGRP, 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, E - EGP
    i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default
    U - per-user static route, o - ODR, P - periodic downloaded static route
    T - traffic engineered route
    Gateway of last resort is not set
    172.16.0.0/16 is variably subnetted, 10 subnets, 3 masks
    D 172.16.81.0/24 [90/2172416] via 192.168.2.14, 00:59:40, Serial0/0/1
    D 172.16.130.0/24 [90/2172416] via 172.16.1.2, 00:59:40, FastEthernet0/0
    D 172.16.80.0/24 [90/2172416] via 192.168.2.14, 00:59:40, Serial0/0/1
    D 172.16.110.0/24 [90/2172416] via 172.16.1.2, 00:59:40, FastEthernet0/0
    D 172.16.230.0/24 [90/2172416] via 172.16.1.2, 00:59:40, FastEthernet0/0
    D 172.16.220.0/24 [90/2172416] via 172.16.1.2, 00:59:40, FastEthernet0/0
    C 172.16.1.0/30 is directly connected, FastEthernet0/0
    D 172.16.120.0/24 [90/2172416] via 172.16.1.2, 00:59:40, FastEthernet0/0
    D 172.16.210.0/24 [90/2172416] via 172.16.1.2, 00:59:40, FastEthernet0/0
    D 172.16.0.0/16 is a summary, 00:59:40, Null0
    192.168.2.0/24 is variably subnetted, 4 subnets, 2 masks
    C 192.168.2.8/30 is directly connected, Serial0/0/0
    D 192.168.2.0/30 [90/2172416] via 192.168.2.10, 00:59:40, Serial0/0/0
    D 192.168.2.0/24 is a summary, 00:59:40, Null0
    C 192.168.2.12/30 is directly connected, Serial0/0/1
    D 192.168.30.0 is a summary, 00:59:40, Null0
    D 192.168.10.0 is a summary, 00:59:40, Null0
    D 192.168.20.0 is a summary, 00:59:40, Null0
    D 192.168.1.0 is a summary, 00:59:40, Null0
    D 192.168.40.0 is a summary, 00:59:40, Null0


    R_Core#
     
    Certifications: CCNA CCNAS CCNAV
    WIP: CCVP
  3. BosonMichael
    Highly Decorated Member Award

    BosonMichael Yottabyte Poster

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    The network mask was added to the network command in IOS release 12.0(4)T: link

    If it's on the list of CCNA topics on Cisco's Web site, then yes, it's on the test. (Hint: look at the 4th section.)
     
    Certifications: CISSP, MCSE+I, MCSE: Security, MCSE: Messaging, MCDST, MCDBA, MCTS, OCP, CCNP, CCDP, CCNA Security, CCNA Voice, CNE, SCSA, Security+, Linux+, Server+, Network+, A+
    WIP: Just about everything!
  4. r.h.lee

    r.h.lee Gigabyte Poster

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    Septima77,

    According to my Cisco 2621 router running Cisco IOS 12.2(2d), the "network" statement can be configured using wildcard bits.

    The 640-816 ICND2 exam outline states:
    Source: https://cisco.hosted.jivesoftware.com/community/certifications/ccna/icnd2?view=overview

    The 640-802 CCNA(R) exam outline states:
    Source: https://cisco.hosted.jivesoftware.com/community/certifications/ccna/ccna_exam?view=overview

    So I would imagine that using wildcard masks may fall under the topic of "...configuring...EIGRP..." as listed above.

    As of Cisco IOS 10.0, EIGRP auto-summary is enabled by default. As of Cisco IOS 12.2 ( 8 ) T, the default for auto-summary is "Command default behavior changed to disabled. " Therefore, by default, you won't "...[be] see[ing] auto-summarization in [your] routing tables."

    Source: http://www.cisco.com/en/US/docs/ios/12_3t/ip_route/command/reference/ip2_a1gt.html#wp1065087
     
    Certifications: MCSE, MCP+I, MCP, CCNA, A+
    WIP: CCDA
  5. Septima77

    Septima77 Nibble Poster

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    Thanks Michael for the heads up.
    Your input is much appreciated.
     
    Certifications: CCNA CCNAS CCNAV
    WIP: CCVP
  6. Septima77

    Septima77 Nibble Poster

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    Mr. Lee,
    Thank you too.
    Have a nice weekend.
     
    Certifications: CCNA CCNAS CCNAV
    WIP: CCVP

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