Filter out specific /30 subnets after /24 is already advertised

RouterOS Forwarding Protocols
1

I have a subnet I have advertised in bgp

/routing bgp network print

Flags: X - disabled 
 #   NETWORK              SYNCHRONIZE
 0   100.110.12.0/22      no

I want to filter(?) out and not advertise 100.110.12.36/30

How would I do that? I have moved the client to a different Tower and am unable to change the client IP. Still need to route to it for a short while.

Rick

2

Write an output route filter that discards your /30 networks, e.g.:
/routing filter rule
add action=discard chain=out prefix=100.110.12.0/22 prefix-length=23-32

Remember that when you later want to migrate to v7 you also need to have some “accept” rule so it is better to add that now:
add action=accept chain=out
(also note that synchronize=no is no longer supported in v7)

3

Thanks! I will not be moving to ROS v7 for a bit.

Appreciate the help.

Rick