[j-nsp] Conditional Advertisemet?

[Chuck Anderson]

On Thu, Oct 05, 2006 at 01:59:17PM -0400, Mellott, Eric wrote:
> Have a BGP configuration where I learn a /16 network from one eBGP
> neighbor and want to advertise a subset of that network, i.e. a /28, to
> a different eBGP neighbor.  Currently, I am able to advertise the subnet
> by configuring a static route which puts the /28 in table, however; this
> kills anything dynamic.  Is there a way with conditional advertisements
> or a generate route to dynamically advertise the /28 upon receipt of the
> /16?  Also, I don't want to rely on the BGP neighbor (who is advertising
> the /16) to give me the /28 instead.  

This might work:

[edit routing-options]
# show generate
route w.x.y.z/28 policy MATCH-16;


[edit policy-options]
# show policy-statement MATCH-16
term 1 {
    from {
        route-filter w.x.0.0/16 exact;
    }
    then accept;
}
term 2 {
    then reject;
}