[rbak-nsp] aggregate route - how to advertise

[Marcin Kuczera]

hello,

could anyone explain me how can I create an aggregate and then advertise 
it once one of the subscribers route appears ?

  interface ip-pool loopback
   ip address 89.200.231.1/32
   ip address 89.200.226.1/32 secondary
!
  interface pool multibind lastresort
   ip unnumbered ip-pool
   ip arp proxy-arp always
   ip pool 89.200.226.0/23
   ip pool 89.200.231.0/24

then, I need to advertise aggreates via ospf.

How can I do it in SEOS ?

At the moment I advertise subscriber routes, but... it's a lot of them, 
at the moment only 200 but growing quickly because we just started 
migration to PPPoE on RedBack...

Regards,
Marcin