Injecting 0.0.0.0/1 into BGP
I have a curious case that I wanted to share and get some feedback. Its a simple lab setup:
The PE/CE is OSPF.
There are other sites that are also part of the VPN (but are not relevant to this).
One of the CEs is injecting a few loopbacks into OSPF as external (redistribute connected subnets). The loopback are as follows:
int loopback 50
ip add 126.96.36.199/32
int loopback 100
ip add 192.168.50.1/32
This same CE is doing the following into OSPF:
summary address 0.0.0.0 188.8.131.52
summary address 184.108.40.206 220.127.116.11
Both PEs receive these summaries and istall them into the RIB as E2. There is mutual redistribution between OSPF and MP-BGP, however, only the 18.104.22.168/1 gets put into BGP. 0.0.0.0/1 does not!
I know that BGP needs the "default-information originate" command in order to originate a default...but this is not a default! Its the closest thing to one, but still it is not. I am really curious as to why the 22.214.171.124/1 does make it into BGP (both PEs inject it when they do OSPF to MP-BGP redisti), but the 0.0.0.0/1 does not make it into MP-BGP from either side.
Thanks for your feedback!