02-05-2010 10:38 AM - edited 03-06-2019 09:36 AM
I am having trouble configuring EIGRP summarization. Attached is the network diagram. I am using the CCNA virtual lab to configure this.
Router configs:
R1
--snip--
interface Serial0/0/0
ip address 192.168.1.34 255.255.255.252
no ip directed-broadcast
!
interface Serial0/0/1
ip address 192.168.1.37 255.255.255.252
no ip directed-broadcast
clockrate 2000000
!
--snip--
R1#sh ip eigrp top
IP-EIGRP Topology Table for AS(1)/ID(192.168.1.34)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 10.10.10.8/29, 1 successors, FD is 2172416
via 192.168.1.38 (2172416/28160), Serial0/0/0
P 192.168.1.32/30, 1 successors, FD is 2172416
via Connected, Serial0/0/0
P 192.168.1.36/30, 1 successors, FD is 2172416
via Connected, Serial0/0/1
P 192.168.1.40/30, 1 successors, FD is 2172416
via 192.168.1.38 (2172416/28160), Serial0/0/0
P 10.10.10.0/29, 1 successors, FD is 2172416
via 192.168.1.33 (2172416/28160), Serial0/0/0
R1#
interface Serial0/0/0
ip address 192.168.1.38 255.255.255.252
no ip directed-broadcast
!
interface Serial0/0/1
ip address 192.168.1.41 255.255.255.252
no ip directed-broadcast
clockrate 2000000
!
router eigrp 1
network 192.168.1.0
R3>en
R3#sh ip eigrp top
IP-EIGRP Topology Table for AS(1)/ID(192.168.1.38)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 192.168.1.32/30, 1 successors, FD is 2172416
via 192.168.1.37 (2172416/28160), Serial0/0/1
P 10.10.10.8/29, 1 successors, FD is 2172416
via 192.168.1.42 (2172416/28160), Serial0/0/1
P 192.168.1.36/30, 1 successors, FD is 2172416
via Connected, Serial0/0/0
P 192.168.1.40/30, 1 successors, FD is 2172416
via Connected, Serial0/0/1
P 10.10.10.0/29, 1 successors, FD is 2172416
via 192.168.1.37 (2172416/28160), Serial0/0/1
R3#
Here is one core router configuration that should be summarizing that block:
R2 Con0 is now available
Press RETURN to get started!
R2>en
R2#sh run
Building configuration...
Current configuration : 874 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R2
!
boot-start-marker
boot-end-marker
!
!
!
!
no aaa new-model
!
!
ip cef
!
!
!
!
!
ip subnet-zero
!
!
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
ip address 10.10.10.1 255.255.255.248
no ip directed-broadcast
ip summary-address eigrp 1 192.168.1.32 255.255.255.240
!
interface FastEthernet0/1
no ip address
no ip directed-broadcast
shutdown
!
interface Serial0/0/0
ip address 192.168.1.33 255.255.255.252
no ip directed-broadcast
clockrate 2000000
!
interface Serial0/0/1
no ip address
no ip directed-broadcast
shutdown
clockrate 2000000
!
interface Serial0/1/0
no ip address
no ip directed-broadcast
shutdown
clockrate 2000000
!
interface Serial0/1/1
no ip address
no ip directed-broadcast
shutdown
clockrate 2000000
!
router eigrp 1
network 10.0.0.0
network 192.168.1.0
no auto-summary
!
ip classless
no ip http server
no ip http secure-server
!
!
!
!
!
!
control-plane
!
!
!
!
line con 0
line aux 0
line vty 0 4
login
line vty 5 1180
login
!
scheduler allocate 20000 1000
!
end
R2#
R2>en
R2#sh ip eigrp top
IP-EIGRP Topology Table for AS(1)/ID(192.168.1.33)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 10.10.10.8/29, 1 successors, FD is 2172416
via null (2172416/28160), FastEthernet0/8
P 192.168.1.32/30, 1 successors, FD is 2172416
via Connected, Serial0/0/0
P 192.168.1.36/30, 1 successors, FD is 2172416
via 192.168.1.34 (2172416/28160), Serial0/0/0
P 192.168.1.40/30, 1 successors, FD is 2172416
via 192.168.1.34 (2172416/28160), Serial0/0/0
P 10.10.10.0/29, 1 successors, FD is 2172416
via Connected, FastEthernet0/0
R2#
R2>en
R2#sh ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default
U - per-user static route, o - ODR, P - periodic downloaded static route
T - traffic engineered route
Gateway of last resort is not set
10.0.0.0/29 is subnetted, 2 subnets
D 10.10.10.8 [90/2172416] via 10.10.10.9, 01:31:30, FastEthernet0/0
C 10.10.10.0 is directly connected, FastEthernet0/0
192.168.1.0/30 is subnetted, 3 subnets
C 192.168.1.32 is directly connected, Serial0/0/0
D 192.168.1.36 [90/2172416] via 192.168.1.34, 01:31:30, Serial0/0/0
D 192.168.1.40 [90/2172416] via 192.168.1.34, 01:31:30, Serial0/0/0
R2#
I used a 16 block for the /30 addresses between each serial link. The starting IP is 192.168.1.33, with the network ID being 192.168.1.32.
There is complete connectivity between all devices, but it will not summarize all of the /30's into a single 16 block of .240.
I added in the "auto-summary" command on R1 and R3, and "no auto-summary" on R2 and R4 anyway but it didn't change anything. I'm not sure what I'm missing.
02-05-2010 11:35 AM
You can look at this link
In addition, your IPs in 10.10.10.0/29 range seems to be out of range. Valid IPs are only from 10.10.10.1 to 10.10.10.6 for /29
Thanks.
02-05-2010 11:56 AM
Just labbed this up with dynamips and it works as expected ie.
if you turn on auto-summary on R2 & R4 then the 3560 switch just sees 2 entries for 192.168.1.0/24
if you use the ip summary-address eigrp .. command on the interfaces facing the 3560 then the 3560 switch sees 2 entries for 192.168.1.32/28.
So it all works as expected. Remember that you will only see the effects of summarisation on the 3560 and not on any of the other routers.
I'm assuming your 3560 is running as a L3 switch and is an EIGRP peer with R2 & R4.
Jon
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