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EIGRP Evaluation Sim

February 9th, 2015 in Lab Sim Go to comments

You have been asked to evaluate how EIGRP is functioning in a network.

EIGRP_Topology.jpg

The configuration of R1 to R6 are posted below for your reference, useless lines are omitted:

R1
interface Loopback0
ip address 150.1.1.1 255.255.255.255
!
interface Ethernet0/0
description Link to R2
ip address 192.168.12.1 255.255.255.0
ip bandwidth-percent eigrp 1 20
!
interface Ethernet0/1
description Link to R3
ip address 192.168.13.1 255.255.255.0
ip bandwidth-percent eigrp 1 20
delay 5773
!
router eigrp 1
network 192.168.12.0
network 192.168.13.0
net 150.1.1.1 0.0.0.0
variance 11
R2
interface Ethernet0/0
description Link to R1
ip address 192.168.12.2 255.255.255.0
!
interface Ethernet0/1
description Link to R4
ip address 192.168.24.2 255.255.255.0
ip authentication mode eigrp 1 md5
ip authentication key-chain eigrp 1 CISCO
!
router eigrp 1
network 192.168.12.0
network 192.168.24.0
!
key chain CISCO
key 1
key-string firstkey
key chain FIRSTKEY
key 1
key-string CISCO
key chain R3
key 1
key-string R3
key 2
key-string R1
R3
interface Ethernet0/0
description Link to R5
ip address 192.168.35.3 255.255.255.0
!
interface Ethernet0/1
description Link to R1
ip address 192.168.13.3 255.255.255.0
!
router eigrp 1
network 192.168.13.0
network 192.168.35.0
R4
interface Loopback0
ip address 150.1.4.4 255.255.255.255
!
interface Ethernet0/0
description Link to R6
ip address 192.168.46.4 255.255.255.0
!
interface Ethernet0/1
description Link to R2
ip address 192.168.24.4 255.255.255.0
ip authentication mode eigrp 1 md5
ip authentication key-chain eigrp 1 CISCO
!
router eigrp 1
network 192.168.46.0
network 192.168.24.0
network 150.1.4.4 0.0.0.0
!
key chain CISCO
key 1
key-string firstkey
R5
interface Ethernet0/0
description Link to R3
ip address 192.168.35.5 255.255.255.0
!
interface Ethernet0/1
description Link to R6
ip address 192.168.56.5 255.255.255.0
!
router eigrp 1
network 192.168.35.0
network 192.168.56.0
R6
interface Loopback0
ip address 150.1.6.6 255.255.255.255
!
interface Loopback1
ip address 172.16.6.6 255.255.255.255
!
interface Ethernet0/0
ip address 192.168.46.6 255.255.255.0
!
interface Ethernet0/1
ip address 192.168.56.6 255.255.255.0
!
router eigrp 1
distribute-list 1 out
network 150.1.6.6 0.0.0.0
network 172.16.6.6 0.0.0.0
network 192.168.46.0
network 192.168.56.0
!
access-list 1 permit 192.168.46.0
access-list 1 permit 192.168.56.0
access-list 1 permit 150.1.6.6
access-list 1 deny 172.16.6.6
access-list 2 permit 192.168.47.1
access-list 2 permit 192.168.13.1
access-list 2 permit 192.168.12.1
access-list 2 deny 150.1.1.1

Note: This sim uses IOS version 15 so “no auto-summary” is the default setting of EIGRP. You don’t have to type it.

You can download this sim to practice at http://www.digitaltut.com/download/ROUTE_EIGRP.zip. Please use GNS3 with version older than v1.0 to open it (v0.8.3.1 for example). IOS used in this lab: c3640-jk9s-mz.124-16.bin

Question 1

Explanation

First we need to get the IP address of R6’s loopback address by “show ip interface brief” command on R6:

R6_show_ip_interface_brief.jpg

Now we learned the R6’s loopback address is 150.1.6.6. To see the ratio of traffic that is load shared between paths, use the “show ip route 150.1.6.6” command on R1:

R1_show_ip_route.jpg

This means that after 19 packets are sent to 192.168.13.3, R1 will send 80 packets to 192.168.12.2 (ratio 19:80). This is unequal cost path Load balancing (configured with “variance” command).

Question 2

Explanation

Use the “show running-config” on R6 we will see a distribute-list applying under EIGRP:

R6_show_run_distribute-list.jpg

With this distribute-list, only networks 192.168.46.0; 192.168.56.0 and 150.1.6.6 are advertised out by R6.

Question 3

Explanation

Check on both R2 and R4:

R2_key_chain.jpg R4_key_chain.jpg

 

 

To successfully authenticate between two EIGRP neighbors, the key number and key-string must match. The key chain name is only for local use. In this case we have key number “1” and key-string “CISCO” and they match so EIGRP neighbor relationship is formed.

Question 4

Explanation

To check the advertised distance for a prefix we cannot use the “show ip route” command because it only shows the metric (also known as Feasible Distance). Therefore we have to use the “show ip eigrp topology” command:

R1_show_ip_eigrp_topology.jpg

Update: Although the “show ip eigrp topology” does not work in the exam but the “show ip eigrp 1 topology” does work so please use this command instead and we will find out the advertised distance on R1.

There are two parameters in the brackets of 192.168.46.0/24 prefix: (1810944/333056). The first one “1810944” is the Feasible Distance (FD) and the second “333056” is the Advertised Distance (AD) of that route -> A is correct.

Just for your reference, this is the output of the “show ip route” command on R1:

R1_show_ip_route_advertised_distance.jpg

In the first line:

D 192.168.46.0/24 [90/ 1810944] via 192.168.12.2, 00:10:01, Ethernet0/0

The first parameter “90” is the EIGRP Administrative Distance. The second parameter “1810944” is the metric of the route 192.168.46.0/24. R1 will use this metric to advertise this route to other routers but the question asks about “the advertised distance for the 192.168.46.0 network on R1” so we cannot use this command to find out the answer.

Question 5

Explanation

Check with the “show running-config” command on R1:

R1_show_run_eigrp_bandwidth.jpg

In the “ip bandwitdh-percent eigrp 1 20” command, “1” is the EIGRP AS number while “20” is the percent of interface’s bandwidth that EIGRP is allowed to use.

Note: By default, EIGRP uses up to 50% of the interface bandwidth. The bandwidth-percent value can be configured greater than 100%. It is useful when we set interface bandwidth lower than the real capacity of the link (for policy reasons, for example).

Comments
Comment pages
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    June 14th, 2017

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