bgp best practice question

I need to make one of our data centers internet accessible, i plan to advertise a /24 out of our existing /22 network block at our new site. My question is for our main datacenter, is it a better idea to continue to advertise the full /22 or advertise the remaining /23 and /24 networks ?

- Jon Heise

Depends on a few things, but the main questions are probably:

Are the data-centers connected on the backside (VPN, etc. - could the
new dc failover through the main dc)?
Yes - /22
Will that /24 ever be used in the main datacenter?
Yes - /22


22 + 24. 23+24+24 makes no sense. There is no reason to fear getting extra
traffic, as traffic will plummet once hosts stop responding.