I'm having a weird issue. Here is the setup. We have 2 Foundry SX's.
SX01 ---> ISPA | | SX02 ---> ISPB
I have a /24 from ISPA and another /24 from ISPB. Both /24's are able to be announced to each of the providers.
iBGP runs between the two SX's and eBGP is being used from each of the SX's to the respective ISP.
So, I have the following on the SX's:
ip route 184.108.40.206/24 null0 ip route 220.127.116.11/24 null0
I also have prefix-lists configured for each of the /24's and configured the bgp neighbors to make use of the prefix-lists.
My problem is that whenever I add the above null routes to both routers at the same time, I get connectivity issues and complete packetloss. I've tried changing the administrative distance on these static routes but with no luck. If I only add these null routes to one of the SX's and remove them from the other, then the prefixes get announced fine to the respective ISP and things work fine.
Any ideas how to fix? On cisco devices, it's as simple as adding the above commands to both edge routers so not sure why this isn't working at the moment.