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| Topology |
ROUTER 5
Receive routes with metric redistributed from neighbor.
R5#sh ip int br
Interface IP-Address OK? Method Status Protocol
FastEthernet0/1 172.16.1.5 YES manual up up
R5#sh run | sec router
router rip
version 1
network 172.16.0.0
R5#sh ip route | b Gate
Gateway of last resort is not set
R 4.0.0.0/8 [120/5] via 172.16.1.1, 00:00:08, FastEthernet0/1
172.16.0.0/24 is subnetted, 1 subnets
C 172.16.1.0 is directly connected, FastEthernet0/1
R 10.0.0.0/8 [120/5] via 172.16.1.1, 00:00:08, FastEthernet0/1
R 192.168.1.0/24 [120/5] via 172.16.1.1, 00:00:08, FastEthernet0/1
R5#
ROUTER 1
- EIGRP will auto-sum routes, when redistributed to classful protocol (RIPv1, IGRP), even no auto-summary is configured
- EIGRP will NOT auto-sum external (redistributed) routes, sended to another EIGRP neighbor, even auto-summary is configured
R1#sh ip int br | exc down
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 10.1.1.1 YES manual up up
FastEthernet0/1 172.16.1.1 YES manual up up
R1#sh run | sec router
router eigrp 1
redistribute rip metric 10 100 255 1 1500
network 10.1.1.1 0.0.0.0
auto-summary
router rip
version 1
redistribute eigrp 1 metric 5
network 172.16.0.0
R1#sh ip route | b Gate
Gateway of last resort is not set
4.0.0.0/32 is subnetted, 1 subnets
D EX 4.4.4.4 [170/256028160] via 10.1.1.2, 00:23:34, FastEthernet0/0
172.16.0.0/24 is subnetted, 1 subnets
C 172.16.1.0 is directly connected, FastEthernet0/1
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, FastEthernet0/0
D EX 192.168.1.0/24 [170/256028160] via 10.1.1.2, 00:23:34, FastEthernet0/0
R1#
 |
| EIGRP Update with auto-summary enabled |
ROUTER 2
R2#sh ip route | beg Gate
Gateway of last resort is not set
4.0.0.0/32 is subnetted, 1 subnets
O IA 4.4.4.4 [110/2] via 192.168.1.4, 01:10:21, FastEthernet0/1
172.16.0.0/24 is subnetted, 1 subnets
D EX 172.16.1.0 [170/256028160] via 10.1.1.1, 00:43:06, FastEthernet0/0
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, FastEthernet0/0
C 192.168.1.0/24 is directly connected, FastEthernet0/1
R2#
ROUTER 4
R4#sh ip route | beg Ga
Gateway of last resort is not set
4.0.0.0/24 is subnetted, 1 subnets
C 4.4.4.0 is directly connected, Loopback4
172.16.0.0/24 is subnetted, 1 subnets
O E2 172.16.1.0 [110/20] via 192.168.1.2, 00:43:24, FastEthernet0/1
10.0.0.0/24 is subnetted, 1 subnets
O E2 10.1.1.0 [110/20] via 192.168.1.2, 01:10:29, FastEthernet0/1
C 192.168.1.0/24 is directly connected, FastEthernet0/1
R4#
ROUTER 3
R3#sh ip route | be Gate
Gateway of last resort is not set
4.0.0.0/32 is subnetted, 1 subnets
D EX 4.4.4.4 [170/256028160] via 10.1.1.2, 01:11:35, FastEthernet0/0
172.16.0.0/24 is subnetted, 1 subnets
D EX 172.16.1.0 [170/256028160] via 10.1.1.1, 00:44:56, FastEthernet0/0
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, FastEthernet0/0
D EX 192.168.1.0/24 [170/256028160] via 10.1.1.2, 01:11:35, FastEthernet0/0
R3#