I have a EIGRP topology set up in GNS3. It looks like this:
The neighbor relationship between R7 and R8 is constantly flapping and I cannot figure out why. Hello timers and time delays are all set properly. I think it must be my configuration. I also sniffed the network traffic in wireshark and it is flooded with ICMP TTL Exceeded packets from R7 destined to R8.
I have tested it as follows:
- Turning on only R1-R6 = EIGRP Routing working properly
- Turning on only R7-R9 = EIGRP Routing working properly
- Turning on ALL Routers = Neighbors flapping and network flooded with ICMP packets
Here are my configs:
#R1
int f1/0
ip addr 172.16.1.1 255.255.255.0
no shut
int lo0
ip addr 192.168.1.1 255.255.255.240
no shut
int lo1
ip addr 192.168.1.17 255.255.255.240
no shut
int lo2
ip addr 192.168.1.33 255.255.255.224
no shut
int lo3
ip addr 192.168.1.65 255.255.255.224
no shut
int lo4
ip addr 192.168.1.97 255.255.255.224
no shut
int lo5
ip addr 192.168.1.129 255.255.255.192
no shut
int f1/1
ip addr 192.168.1.193 255.255.255.192
no shut
end
conf t
router eigrp 1
network 172.16.1.0 0.0.0.255
network 192.168.1.0 0.0.0.255
#R2
int f1/0
ip addr 172.16.1.2 255.255.255.0
no shut
int lo0
ip addr 192.168.2.1 255.255.255.248
no shut
int lo1
ip addr 192.168.2.9 255.255.255.248
no shut
int lo2
ip addr 192.168.2.17 255.255.255.240
no shut
int lo3
ip addr 192.168.2.33 255.255.255.224
no shut
int lo4
ip addr 192.168.2.65 255.255.255.224
no shut
int lo5
ip addr 192.168.2.97 255.255.255.224
no shut
int f1/1
ip addr 192.168.2.129 255.255.255.128
no shut
end
conf t
router eigrp 1
network 172.16.1.0 0.0.0.255
network 192.168.2.0 0.0.0.255
#R3
int f1/0
ip addr 172.16.1.3 255.255.255.0
no shut
int lo0
ip addr 192.168.3.1 255.255.255.240
no shut
int lo1
ip addr 192.168.3.17 255.255.255.240
no shut
int lo2
ip addr 192.168.3.33 255.255.255.224
no shut
int lo3
ip addr 192.168.3.65 255.255.255.224
no shut
int lo4
ip addr 192.168.3.97 255.255.255.224
no shut
int lo5
ip addr 192.168.3.129 255.255.255.192
no shut
int f1/1
ip addr 192.168.3.193 255.255.255.192
no shut
end
conf t
router eigrp 1
network 172.16.1.0 0.0.0.255
network 192.168.3.0 0.0.0.255
#R4
int f1/0
ip addr 172.16.2.5 255.255.255.0
no shut
int lo0
ip addr 192.168.6.1 255.255.255.240
no shut
int lo1
ip addr 192.168.6.17 255.255.255.240
no shut
int lo2
ip addr 192.168.6.33 255.255.255.224
no shut
int lo3
ip addr 192.168.6.65 255.255.255.224
no shut
int lo4
ip addr 192.168.6.97 255.255.255.224
no shut
int lo5
ip addr 192.168.6.129 255.255.255.192
no shut
int f1/1
ip addr 192.168.6.193 255.255.255.192
no shut
end
conf t
router eigrp 1
network 172.16.2.0 0.0.0.255
network 192.168.6.0 0.0.0.255
#R5
int f1/0
ip addr 172.16.2.6 255.255.255.0
no shut
int lo0
ip addr 192.168.7.1 255.255.255.248
no shut
int lo1
ip addr 192.168.7.9 255.255.255.248
no shut
int lo2
ip addr 192.168.7.17 255.255.255.240
no shut
int lo3
ip addr 192.168.7.33 255.255.255.224
no shut
int lo4
ip addr 192.168.7.65 255.255.255.224
no shut
int lo5
ip addr 192.168.7.97 255.255.255.224
no shut
int f1/1
ip addr 192.168.7.129 255.255.255.128
no shut
end
conf t
router eigrp 1
network 172.16.2.0 0.0.0.255
network 192.168.7.0 0.0.0.255
#R6
int f1/0
ip addr 172.16.2.7 255.255.255.0
no shut
int lo0
ip addr 192.168.8.1 255.255.255.240
no shut
int lo1
ip addr 192.168.8.17 255.255.255.240
no shut
int lo2
ip addr 192.168.8.33 255.255.255.224
no shut
int lo3
ip addr 192.168.8.65 255.255.255.224
no shut
int lo4
ip addr 192.168.8.97 255.255.255.224
no shut
int lo5
ip addr 192.168.8.129 255.255.255.192
no shut
int f1/1
ip addr 192.168.8.193 255.255.255.192
no shut
end
conf t
router eigrp 1
network 172.16.2.0 0.0.0.255
network 192.168.8.0 0.0.0.255
#R7
int s1/1
ip addr 10.9.0.2 255.255.255.252
no shut
int s1/0
ip addr 119.119.119.1 255.255.255.252
no shut
int f2/0
ip addr 172.16.1.9 255.255.255.0
no shut
int f2/1
ip addr 172.16.2.9 255.255.255.0
no shut
router eigrp 1
network 10.9.0.0 0.0.0.3
network 119.119.119.0 0.0.0.3
network 172.16.2.0 0.0.0.255
network 172.16.1.0 0.0.0.255
end
#R8
int s1/1
ip addr 10.11.0.2 255.255.255.252
no shut
int s1/0
ip addr 119.119.119.2 255.255.255.252
no shut
int f2/0
ip addr 172.16.2.11 255.255.255.0
no shut
int f2/1
ip addr 172.16.1.11 255.255.255.0
no shut
router eigrp 1
network 10.11.0.0 0.0.0.3
network 119.119.119.0 0.0.0.3
network 172.16.2.0 0.0.0.255
network 172.16.1.0 0.0.0.255
end
#R9
int s1/1
ip addr 10.9.0.1 255.255.255.252
no shut
int s1/0
ip addr 10.11.0.1 255.255.255.252
no shut
router eigrp 1
network 10.9.0.0 0.0.0.3
network 10.11.0.0 0.0.0.3
end
I believe it must be an error in configuration but I cannot find it.
Any help would be greatly appreciated.
Best Answer
You're running a discontinuous classful network 172.16.0.0 / 16 in two network portions. In this particular case, auto summarization will make your routing table inconsistent by summarizing the network above and advertising it to the other side and vice-versa.
Try adding no auto-summary to your eigrp settings on ALL routers so that the final configuration looks like: