Task 2.3 Mock Lab 2

 

R6 is connected to BB1 using frame-relay - we are asked to config this interface into EIGRP 10 - easy enough and the adjacency works.  We are then asked to ensure that only networks 164.X.90.0/16 and 150.X.0.0/16 are advertised to BB1. 

R6 is also running EIGRP 100 covering interfaces L0 (150.X.6.6/24) and F0/1 (164.X.26.6/24). 

We are not allowed to use ip summary-address eigrp !

Also we can't add static routes as this is a general requirement

OK so my first thought was ensure that EIGRP 10 used auto summary, and add L0 and F0/1 interfaces into EIGRP 10! I couldn't get this work!  BB1 didn't see any routes from R6.

Next thought was redistribution - from eigrp 100 into 10 (removing the network statements for L0 and F0/1 under EIGRP 10 first), however redistributed routes do not get summarised on a network boundary so doesn't meet the requirements

I then removed L0 and F0/1 from EIGRP 100 and then added the same networks to EIGRP 10 - this worked - but then you loose the neighborship between R6 and R2 via F0/1.  If you follow this to it's logic conclusion - R2's F0/0 would need to run EIGRP 10, and then redistribution between EIGRP 100 and EIGRP 10 would need to be performed on R2 instead!  However this would break the requirements for task 2.4.

The only way I can how to get this to work is add to two static routes to null0 for 150.X.0.0/16 and 164.X.0.0/16 and redistribute static into EIGRP 10 - however this breaks the rules!

As anyone else got any comments? In particular have I overlooked an alternative solution?

 

Comments

  •  

    Hi,

    Try to configure the auto-summary command for EIGRP 100 instead of EIGRP 10, and configure outbound distribute-list for EIGRP 10 to filter subnets. Redistribution has to be configured for sure on R6.

     

    Regards,

    Bassam

  • Try to configure the auto-summary command for EIGRP 100 instead of EIGRP 10, and configure outbound distribute-list for EIGRP 10 to filter subnets. Redistribution has to be configured for sure on R6.

     

    Yes I tried this and it worke - I immediately see /16 routes on BB1 when the auto-summary was enabled on AS 100.

    Of course the only snag with this configuration is the loss of granuality of routing information in the rest of AS 100 for 150.X.6.0/24 -

    Rack3R2#show ip route 150.3.0.0 longer-prefixes
    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

         150.3.0.0/16 is variably subnetted, 3 subnets, 2 masks
    D       150.3.1.0/24 [90/6151936] via 164.3.23.3, 01:07:06, Serial0/0.23
                         [90/20640000] via 164.3.12.1, 01:07:06, Serial0/0.12
    D       150.3.0.0/16 [90/156160] via 164.3.26.6, 00:11:19, FastEthernet0/0
    C       150.3.2.0/24 is directly connected, Loopback0

    Here was my finished config -

    router eigrp 100
     redistribute eigrp 10
     network 150.3.6.6 0.0.0.0
     network 164.3.26.6 0.0.0.0
     auto-summary
    router eigrp 10
     redistribute eigrp 100
     network 54.3.7.6 0.0.0.0
     distribute-list prefix PF_MAJOR_NET out Virtual-Template1
     no auto-summary

    ip prefix-list PF_MAJOR_NET seq 5 deny 150.3.0.0/16 ge 24 le 24
    ip prefix-list PF_MAJOR_NET seq 10 deny 164.3.0.0/16 ge 24 le 24
    ip prefix-list PF_MAJOR_NET seq 15 permit 0.0.0.0/0 le 32

    I chose this this prefix list just in case other networks happen to be advertised into EIGRP in a later task.

    Whereas

    ip prefix-list PF_MAJOR_NET permit 150.3.0.0/16
    ip prefix-list PF_MAJOR_NET permit 164.3.0.0/16

    could have been a little heavy handed. Here's the routing table on BB1 -

    RS.3.3.BB1>show ip route eigrp
    D EX 164.3.0.0/16 [170/2588160] via 54.3.7.6, 00:16:23, Virtual-Access3
    D EX 150.3.0.0/16 [170/2713600] via 54.3.7.6, 00:16:23, Virtual-Access3

    Anyway thanks for your help Bassam!

     

     

     

     

     

     

  • Weird behaviour.

     

    I also have tried incorrectly to redistribute EIGRP 100 into 10 with auto summary keyword under rouer eigrp 10. I was evaluating myself with NO acces at alll into BB1 so i was not able to verify that redistributed prefixes weren't get summarized in process 10. So i get no points.

     

    Today I'm simulating this environment and succesfully enable F0/1 and Lo0 interfaces in process 10 and voila

     

    Outputs:

    Rack1R6#sh ip eigrp 10 interfaces 

    IP-EIGRP interfaces for process 10

     

                            Xmit Queue   Mean   Pacing Time   Multicast    Pending

    Interface        Peers  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes

    Vi1                1        0/0       134       0/10         586           0

    Vt1                0        0/0         0       0/10           0           0

    Lo0                0        0/0         0       0/10           0           0

    Fa0/1              0        0/0         0       0/10           0           0

    Rack1R6#

    Rack1R6#sh run | s router eigrp 10

    router eigrp 100

     redistribute eigrp 10 metric 1 1 1 1 1

     network 150.1.6.6 0.0.0.0

     network 164.1.26.6 0.0.0.0

     no auto-summary

    router eigrp 10

     network 54.1.7.0 0.0.0.255

     network 150.1.0.0

     network 164.1.0.0

     auto-summary

    Rack1R6#

    Rack1R6#                           

    Rack1R6#54.1.7.254

    Trying 54.1.7.254 ... Open

     

    BB1>sh ip ro eigrp

    D    164.1.0.0/16 [90/2588160] via 54.1.7.6, 03:01:31, Virtual-Access1

    D    150.1.0.0/16 [90/2713600] via 54.1.7.6, 03:01:31, Virtual-Access1

    BB1>

     

    Regards

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