We try to advertise our Public IP via ASN to 2 ISP (A & B).
Currently running ROS6.11 on x86.

Our network:
10.1.1.0/22

Instance all OK (redistribute to another BGP enable).
Peer all OK.

/ip bgp network:
10.1.1.0/22; 10.1.1.0/23; 10.1.1.0/24; 10.1.2.0/24; 10.1.3.0/23; 10.1.3.0/24; 10.1.4.0/24
all sync=disable

Announce via ISP A:
/routing filters:
to A : 10.1.1.0/24 accept; 10.1.1.0/24 accept; 10.1.3.0/23 prefix-length=23-24 discard

Announce via ISP B:
/routing filters:
to B: 10.1.3.0/24 accept; 10.1.4.0/24 accept; 10.1.1.0/23 prefix-length=23-24 discard

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Usually after this we can announce our IP, but not this time.
We must assign IP to let it announce.
If we want to announce we must put 10.1.1.1/24 to router interface to let our upstream provider receive our prefix, so with another IP, we must assign 10.1.2.1/24; 10.1.3.1/24; 10.1.4.1/24 to interface to let our upstream receive our prefix.
Whereis the problem? Anyone have smiliar problems?
Thanks all.

Solved.
Thanks anyway

Maybe you could share the solution?