Lab Challenge EIGRP

This is a Lab Challenge only for EIGRP, based on the request from one of the users at the networking-forum.com. The base configuration is not too complex and is limited to five routers but it got some nice stuff to look after. I hope you enjoy it šŸ™‚
If you want to do the lab and got questions, just drop me a line.

As with the other Lab in the end you have to have full connectivity between all routers and their interfaces.

Configure your lab according to the diagram (click on the picture to see it full size)

Configuration Tasks

Frame-Relay
Configure Frame-Relay as shown in the diagram, only use the physical Interfaces.

EIGRP
Configure all interfaces into EIGRP AS100
Configure unicast neighborships between: R3 <-> R4 and R3<->R5. R4 and R5 should not form a neighborship. R4 and R5 should still have each others loopback interface in their routing table.
Configure Default Routing on R2, use a ip summary-address and assure that all routers in the domain have the default route to R2. Also be sure that every router still has R2s loopback 0 address in its routing table.
Configure R1 so that it uses a 3:1 load sharing for R2s loopback network 99.99.2.0/24 over its two interfaces to R3. Do not use the bandwidth command.
Configure an adjacency authentication between R1 and R3 on their Ethernet connection.

The Solution to the Challenge Lab can be found here

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5 comments

  1. Sharath

    Hi,

    It was a nice lab and here are some of my views:

    1.About the authentication part, nothing is mentioned so I assumed my own key chain and key-string here.

    2.Ensure that all the routers in the domain has default route to R2. Does this mean 0.0.0.0/0 in all the routers table should be pointing to R2’s interface address. I could achieve this only in the FR domain using no ip next-hop self command.

    So R1 and R3 sees 116.1.123.2 as next-hop for default route.
    But R4, R5 still sees 116.1.54.3 as the next-hop for default-route.

    3. 1:3 load sharing. I assumed for every 3 packets placed on Ethernet interface, one has to go for FR interface.

    R1#sh ip route 99.99.2.0
    Routing entry for 99.99.2.0/24
    Known via “eigrp 100”, distance 90, metric 1152000, type internal
    Redistributing via eigrp 100
    Last update from 116.1.123.2 on Serial0/0, 00:06:47 ago
    Routing Descriptor Blocks:
    116.1.123.2, from 116.1.123.3, 00:06:47 ago, via Serial0/0
    Route metric is 3456000, traffic share count is 1
    Total delay is 135000 microseconds, minimum bandwidth is 1544 Kbit
    Reliability 255/255, minimum MTU 1500 bytes
    Loading 1/255, Hops 2
    * 116.1.13.3, from 116.1.13.3, 00:06:47 ago, via FastEthernet1/0
    Route metric is 1152000, traffic share count is 3
    Total delay is 45000 microseconds, minimum bandwidth is 1544 Kbit
    Reliability 255/255, minimum MTU 1500 bytes
    Loading 1/255, Hops 2
    Ofcourse, since BW should not be touched only delay parameter was factored. any better idea here?

    Apart from these.. all routers see all loop backs:

    R1
    R1#sh ip route eigrp
    116.0.0.0/24 is subnetted, 3 subnets
    D 116.1.54.0 [90/514560] via 116.1.13.3, 00:09:47, FastEthernet1/0
    99.0.0.0/24 is subnetted, 5 subnets
    D 99.99.2.0 [90/3456000] via 116.1.123.2, 00:09:47, Serial0/0
    [90/1152000] via 116.1.13.3, 00:09:47, FastEthernet1/0
    D 99.99.3.0 [90/640000] via 116.1.13.3, 00:09:47, FastEthernet1/0
    D 99.99.4.0 [90/642560] via 116.1.13.3, 00:09:47, FastEthernet1/0
    D 99.99.5.0 [90/642560] via 116.1.13.3, 00:09:47, FastEthernet1/0
    D* 0.0.0.0/0 [90/3456000] via 116.1.123.2, 00:09:47, Serial0/0
    [90/1152000] via 116.1.13.3, 00:09:47, FastEthernet1/0

    R2
    R2#sh ip route eigrp
    116.0.0.0/24 is subnetted, 3 subnets
    D 116.1.54.0 [90/514560] via 116.1.123.3, 00:10:29, Serial0/0
    D 116.1.13.0 [90/514560] via 116.1.123.3, 00:10:29, Serial0/0
    99.0.0.0/24 is subnetted, 5 subnets
    D 99.99.1.0 [90/642560] via 116.1.123.3, 00:10:29, Serial0/0
    D 99.99.3.0 [90/640000] via 116.1.123.3, 00:10:29, Serial0/0
    D 99.99.4.0 [90/642560] via 116.1.123.3, 00:10:29, Serial0/0
    D 99.99.5.0 [90/642560] via 116.1.123.3, 00:10:29, Serial0/0
    D* 0.0.0.0/0 is a summary, 00:10:29, Null0

    R3
    R3#sh ip route eigrp
    99.0.0.0/24 is subnetted, 5 subnets
    D 99.99.1.0 [90/130560] via 116.1.13.1, 00:11:04, FastEthernet1/0
    D 99.99.2.0 [90/640000] via 116.1.123.2, 00:11:04, Serial0/0
    D 99.99.4.0 [90/130560] via 116.1.54.4, 00:11:04, FastEthernet2/0
    D 99.99.5.0 [90/130560] via 116.1.54.5, 00:11:04, FastEthernet2/0
    D* 0.0.0.0/0 [90/640000] via 116.1.123.2, 00:11:04, Serial0/0

    R4
    R4#sh ip route eigrp
    116.0.0.0/24 is subnetted, 3 subnets
    D 116.1.123.0 [90/514560] via 116.1.54.3, 01:14:39, FastEthernet0/0
    D 116.1.13.0 [90/5120] via 116.1.54.3, 00:38:02, FastEthernet0/0
    99.0.0.0/24 is subnetted, 5 subnets
    D 99.99.1.0 [90/133120] via 116.1.54.3, 00:38:00, FastEthernet0/0
    D 99.99.2.0 [90/642560] via 116.1.54.3, 00:11:32, FastEthernet0/0
    D 99.99.3.0 [90/130560] via 116.1.54.3, 01:23:43, FastEthernet0/0
    D 99.99.5.0 [90/133120] via 116.1.54.5, 01:23:43, FastEthernet0/0
    D* 0.0.0.0/0 [90/642560] via 116.1.54.3, 00:11:32, FastEthernet0/0

    R5
    116.0.0.0/24 is subnetted, 2 subnets
    D 116.1.123.0 [90/514560] via 116.1.54.3, 00:20:06, FastEthernet0/0
    C 116.1.54.0 is directly connected, FastEthernet0/0
    99.0.0.0/24 is subnetted, 5 subnets
    D 99.99.1.0 [90/642560] via 116.1.54.3, 00:15:42, FastEthernet0/0
    D 99.99.2.0 [90/642560] via 116.1.54.3, 00:01:12, FastEthernet0/0
    D 99.99.3.0 [90/130560] via 116.1.54.3, 00:29:11, FastEthernet0/0
    D 99.99.4.0 [90/133120] via 116.1.54.4, 00:29:09, FastEthernet0/0
    C 99.99.5.0 is directly connected, Loopback0
    D* 0.0.0.0/0 [90/642560] via 116.1.54.3, 00:02:40, FastEthernet0/0

    R4 and R5 does not have eigrp relation-ships.

    R5#sh ip eigrp neighbors
    IP-EIGRP neighbors for process 100
    H Address Interface Hold Uptime SRTT RTO Q Seq
    (sec) (ms) Cnt Num
    0 116.1.54.3 Fa0/0 10 01:24:56 214 1284 0 79

    R4#sh ip eigrp neighbors
    IP-EIGRP neighbors for process 100
    H Address Interface Hold Uptime SRTT RTO Q Seq
    (sec) (ms) Cnt Num
    0 116.1.54.3 Fa0/0 14 01:25:25 535 3210 0 79

    Thanks for the lab and please keep it going.

    Best regards,
    Sharath

  2. pashtuk

    Hi Sarath
    Thank you, Im glad you found it usefull šŸ™‚
    Here are the answers to your points:
    1. Yes correct, doesnt really matter which password to use for the Authentication šŸ™‚
    2. Yes every router should have a 0.0.0.0/0 router to R2 and there is another option to achieve this, have a look at the mentioned ip summary-address command
    3. Nothing more to add, you did it. There can be other ways but IMHO its the simplest one to do so.

    The tricky part with R2’s Loopback will come after you configured the default route šŸ™‚

    Looks like you found the other two routing thingies on R3 too since you got it right with the Loopbacks and the loadsharing.

    best regards
    Michel

  3. Sharath

    Thanks for your reply.

    Not sure I understand point#2. R2 is in fact advertising 0.0.0.0/0 to R3 and R1. R3 is advertising both 116.1.123.0/24 and 0.0.0.0/0 to R4 and R5.

    So R4 and R5 both are performing recursive lookup to R3 and seeing 0.0.0.0/0 via 116.1.54.3.

    R4#sh ip route eigrp
    116.0.0.0/24 is subnetted, 3 subnets
    D 116.1.123.0 [90/514560] via 116.1.54.3, 00:16:31, FastEthernet0/0
    D 116.1.13.0 [90/5120] via 116.1.54.3, 00:16:31, FastEthernet0/0
    99.0.0.0/24 is subnetted, 5 subnets
    D 99.99.1.0 [90/133120] via 116.1.54.3, 00:16:31, FastEthernet0/0
    D 99.99.2.0 [90/642560] via 116.1.54.3, 00:16:31, FastEthernet0/0
    D 99.99.3.0 [90/130560] via 116.1.54.3, 00:16:31, FastEthernet0/0
    D 99.99.5.0 [90/133120] via 116.1.54.5, 00:16:31, FastEthernet0/0
    D* 0.0.0.0/0 [90/642560] via 116.1.54.3, 00:16:31, FastEthernet0/0

    R5#sh ip route eigrp
    116.0.0.0/24 is subnetted, 3 subnets
    D 116.1.123.0 [90/514560] via 116.1.54.3, 00:19:32, FastEthernet0/0
    D 116.1.13.0 [90/5120] via 116.1.54.3, 00:20:18, FastEthernet0/0
    99.0.0.0/24 is subnetted, 5 subnets
    D 99.99.1.0 [90/133120] via 116.1.54.3, 00:20:17, FastEthernet0/0
    D 99.99.2.0 [90/642560] via 116.1.54.3, 00:18:50, FastEthernet0/0
    D 99.99.3.0 [90/130560] via 116.1.54.3, 00:20:18, FastEthernet0/0
    D 99.99.4.0 [90/133120] via 116.1.54.4, 00:20:18, FastEthernet0/0
    D* 0.0.0.0/0 [90/642560] via 116.1.54.3, 00:18:50, FastEthernet0/0

    of course, R2’s loopback is still in the routing table of all the routers. Please enlighten me.

    Regards,
    Sharath

  4. pashtuk

    Hi Sarath
    Sorry Im off for holidays now, I’ll have a look into it when Im back. In the mean time, could you post the relevant config for the default route part? šŸ™‚
    Thanks

    best regards

    Michel

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