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Configure EIGRP in Multiple AS





In this Free CCNP Lab you will learn to configure EIGRP in multiple AS. You will also learn to configure path control and stub routing using this topology created in GNS3. Finally you will use Cisco show, ping and traceroute commands to test and verify your configuration.

Lab Objective:

  • Understand EIGRP implementation in multiple AS.
  • Configure Multiple AS EIGRP in Cisco IOS routers.
  • Redistribute EIGRP between multiple AS
  • Understand and configure path control and stub routing.

Task:

Configure hostnames, console and enable password. Configure IP addressing on all routers as illustrated in the network diagram.

Configure EIGRP for AS 10 as shown in the network diagram. R4 should be configured as an EIGRP stub router. R4 should NEVER advertise any routes. In addition to this, ensure that router R4 will only ever receive a default route from R1 even if external routes are redistributed into EIGRP 10.

Verify your EIGRP configuration using the show ip eigrp neighbors [detail] and the show ip route [eigrp] commands:

R1#sh ip eigrp neighbors detail
IP-EIGRP neighbors for process 10
H   Address                 Interface       Hold Uptime   SRTT   RTO  Q  Seq
                                            (sec)         (ms)       Cnt Num
0   160.1.1.4               Fa0/0             14 00:01:00  388  2328  0  7
   Version 12.4/1.2, Retrans: 0, Retries: 0
   Receive-Only Peer Advertising ( No ) Routes
   Suppressing queries

R4#sh ip route
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 160.1.1.1 to network 0.0.0.0

     160.1.0.0/24 is subnetted, 1 subnets
C       160.1.1.0 is directly connected, FastEthernet0/0
D*   0.0.0.0/0 [90/30720] via 160.1.1.1, 00:06:25, FastEthernet0/0

Configure EIGRP for AS 20 as illustrated in the network diagram. Verify your configuration using the appropriate commands for EIGRP.

Configure EIGRP so that R4 can reach all other routers in the network and vice-versa. Ensure that only the 160.1.1.0/24 is allowed into the topology table for EIGRP 20. Verify your configuration and also ping to and from R4 from the 160.2.2.0/24 and 160.3.3.0/24 subnets.

Following this configuration, verify that external routes exist in the topology tables for both of the autonomous systems. Use the show ip eigrp topology command. Next, verify the routing tables of all the other routers in the topology following the redistribution configuration:

R2#sh ip route eigrp
     160.1.0.0/24 is subnetted, 1 subnets
D EX    160.1.1.0 [170/2172416] via 10.0.0.1, 00:00:48, Serial1/0
     160.3.0.0/24 is subnetted, 1 subnets
D       160.3.3.0 [90/2172416] via 10.0.0.10, 00:15:02, Serial1/1
     10.0.0.0/30 is subnetted, 3 subnets
D       10.0.0.4 [90/2681856] via 10.0.0.10, 00:15:15, Serial1/1
                 [90/2681856] via 10.0.0.1, 00:15:15, Serial1/0

R3#sh ip route eigrp
     160.1.0.0/24 is subnetted, 1 subnets
D EX    160.1.1.0 [170/2172416] via 10.0.0.5, 00:05:37, Serial1/1
     160.2.0.0/24 is subnetted, 1 subnets
D       160.2.2.0 [90/2172416] via 10.0.0.9, 00:20:05, Serial1/0
     10.0.0.0/30 is subnetted, 3 subnets
D       10.0.0.0 [90/2681856] via 10.0.0.9, 00:20:05, Serial1/0
                 [90/2681856] via 10.0.0.5, 00:20:05, Serial1/1

R4#sh ip route
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 160.1.1.1 to network 0.0.0.0

     160.1.0.0/24 is subnetted, 1 subnets
C       160.1.1.0 is directly connected, FastEthernet0/0
D*   0.0.0.0/0 [90/30720] via 160.1.1.1, 00:17:57, FastEthernet0/0

Finally, ping between R4 and 150.2.2.0/24 and 150.3.3.0/24 subnets:

R4#ping 160.2.2.2 source 160.1.1.4

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 160.2.2.2, timeout is 2 seconds:
Packet sent with a source address of 160.1.1.4
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 376/506/784 ms

R4#ping 160.3.3.3 source 160.1.1.4

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 160.3.3.3, timeout is 2 seconds:
Packet sent with a source address of 160.1.1.4
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 792/1064/1628 ms

Assume that the WAN link between R1 and R3 is unreliable and should only be used when the WAN link between R1 and R2 is down. However, an EIGRP neighbor relationship should still be maintained across this link. Configure EIGRP so that neither routers R1 nor R3 use this link unless the WAN link between R1 and R2 is down. You are only allowed to configure R3. Do NOT issue any configuration commands on R1 to complete this task.

Following this, R3 should prefer the path via R2 – even for the 150.1.1.0/24 subnet:

R3#sh ip route eigrp
     160.1.0.0/24 is subnetted, 1 subnets
D EX    160.1.1.0 [170/2172416] via 10.0.0.5, 00:02:38, Serial1/1
     160.2.0.0/24 is subnetted, 1 subnets
D       160.2.2.0 [90/2684416] via 10.0.0.5, 00:02:38, Serial1/1
     10.0.0.0/30 is subnetted, 3 subnets
D       10.0.0.0 [90/2681856] via 10.0.0.5, 00:02:38, Serial1/1

The same applies to R1, which prefers the path via R2 – even for the 150.3.3.0/24 subnet:

R1#sh ip route eigrp
     160.2.0.0/24 is subnetted, 1 subnets
D       160.2.2.0 [90/2172416] via 10.0.0.2, 00:04:35, Serial1/0
     160.3.0.0/24 is subnetted, 1 subnets
D       160.3.3.0 [90/2172416] via 10.0.0.6, 00:03:54, Serial1/1
     10.0.0.0/30 is subnetted, 3 subnets
D       10.0.0.8 [90/2681856] via 10.0.0.6, 00:30:26, Serial1/1
                 [90/2681856] via 10.0.0.2, 00:30:26, Serial1/0

Download this lab now:

  EIGRP-Multiple-AS (85.5 KiB, 1,451 hits)


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