EIGRP Multicast Storm
Posted on 2010-11-08
One of my branch routers was experiencing a sporadic internal network outage. When I got on site, I did a continuous ping to the default gateway (Cisco 2811) and it would randomly drop for a random amount of time on the Fast Ethernet port (T1 Serial was fine)
I suspected a local broadcast storm, so I installed Wireshark on the local server.
I let it run for a bit and saw that the router was blasting it's EIGRP Multicast at about 30,000 per second for ~10 seconds or so. Every time it does this it spikes to total network bandwidth to 99.9% until it's finished.
I've never heard of anything like this and was hoping I could get some help.
Remote location: Cisco 2811 with 1 Serial port to the T1 connection and 1 FA port to a Dell PowerConnect 6248p switch. All workstations and local server are connected to the switch.
This is how I have all 12 of my remote locations setup and they all point to a central Cisco router at our corporate location.
Does anyone know what could possibly trigger an EIGRP Multicast storm like this?