Funky Behavior with my EIGRP IP Sumarization

PLC · ‎06-25-2015

Hi All,

I configured route summarization eigrp. When pinging the R2-destination from R1-source(two hops away) it appears I have some sort of routing loop because I drop packets. I have attached my topology. R1, R3, R2. R3 is in the middle with two interfaces one connected to R1 and the other to R2 so, I summarized in both interfaces. I appreciate your help in advance!

R1

int serial1/1

ip summary address 10.1.0.0 255.255.252.0

R3

int serial 1/1

ip summary address 10.2.0.0 255.255.252.0

!

int serial 1/0

ip summary address 10.2.0.0 255.255.252.0

R2

int s1/1

ip summary address 10.2.0.0 255.255.252.0

Ken.KavanaghJ.R. · ‎06-26-2015

Hey plchacon1,

Can you include your EIGRP configuration and the outputs of "show ip route eigrp" for each router please?

Thanks,

PLC · ‎06-26-2015

yes of course..

R1#

R1#sho run | s eigrp

ip summary-address eigrp 33 10.1.0.0 255.255.252.0 5

router eigrp 33

network 10.1.1.0 0.0.0.255

network 10.1.2.0 0.0.0.255

network 10.1.3.0 0.0.0.255

network 192.168.1.0

no auto-summary

R1#sho 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 not set

10.0.0.0/8 is variably subnetted, 8 subnets, 2 masks

C 10.1.3.0/24 is directly connected, Loopback2

D 10.3.0.0/22 [90/2809856] via 192.168.1.2, 04:40:37, Serial1/1

D 10.2.1.0/24 [90/2297856] via 192.168.1.2, 02:46:40, Serial1/1

C 10.1.2.0/24 is directly connected, Loopback1

D 10.2.2.0/24 [90/2297856] via 192.168.1.2, 02:46:40, Serial1/1

C 10.1.1.0/24 is directly connected, Loopback0

D 10.2.3.0/24 [90/2297856] via 192.168.1.2, 02:46:40, Serial1/1

D 10.1.0.0/22 is a summary, 04:42:39, Null0

C 192.168.1.0/24 is directly connected, Serial1/1

D 192.168.2.0/24 [90/2681856] via 192.168.1.2, 07:13:29, Serial1/1

R1#

R3#sho run | s eigrp

ip summary-address eigrp 33 10.2.0.0 255.255.252.0 5

router eigrp 33

network 10.2.1.0 0.0.0.255

network 10.2.2.0 0.0.0.255

network 10.2.3.0 0.0.0.255

network 192.168.1.0

network 192.168.2.0

no auto-summary

R3#sho 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 not set

10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks

D 10.2.0.0/22 is a summary, 02:49:22, Null0

D 10.3.0.0/22 [90/2297856] via 192.168.2.2, 04:44:12, Serial1/0

C 10.2.1.0/24 is directly connected, Loopback0

C 10.2.2.0/24 is directly connected, Loopback1

C 10.2.3.0/24 is directly connected, Loopback2

D 10.1.0.0/22 [90/2297856] via 192.168.1.1, 04:46:16, Serial1/1

C 192.168.1.0/24 is directly connected, Serial1/1

C 192.168.2.0/24 is directly connected, Serial1/0

R3#

R2#sho run | s eigrp

ip summary-address eigrp 33 10.3.0.0 255.255.252.0 5

router eigrp 33

network 10.3.1.0 0.0.0.255

network 10.3.2.0 0.0.0.255

network 10.3.3.0 0.0.0.255

network 192.168.2.0

no auto-summary

R2#sho 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 not set

10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks

C 10.3.1.0/24 is directly connected, Loopback0

D 10.2.0.0/22 [90/2297856] via 192.168.2.1, 02:47:51, Serial1/1

D 10.3.0.0/22 is a summary, 04:41:18, Null0

C 10.3.3.0/24 is directly connected, Loopback2

C 10.3.2.0/24 is directly connected, Loopback1

D 10.1.0.0/22 [90/2809856] via 192.168.2.1, 04:43:20, Serial1/1

D 192.168.1.0/24 [90/2681856] via 192.168.2.1, 07:14:07, Serial1/1

C 192.168.2.0/24 is directly connected, Serial1/1

R2#