BGP question

[comsats]

guys suppose we are having 10 or 20 routes on WAN router learned from EIGRP

the wan routers has 10.15.15.0/24 to 10.15.X.0/24 etc (learned from EIGRP) and if we want to advertise a router in BGP can we use

10.15.0.0/16 route rather then putting 20 routes secondly do we have to put static null route for 10.15.0.0/16 or not

thanks for looking

[comsats]

Jon

     Now one last question buddy and i guess it takes me to square one........i hav ethose 10.4.1.0/24 to 200 (its mix) so all togather 70 routes on my WAN router.......we have dual home BGP connection with one AS though........no IBGP is running and dont ask me why :-) as it was before i joined.....

now i have another 40 routes in WAN router (from EIGRP) which i dont want to advertise and excpet one which is 10.5.1.0/24 (there are 10 of them)

the requirment is that 10.4.1.0/24 till 10.4.200.0/24 takes ISP one and 10.5.1.0/24 to 10.5.200.0/24 takes ISP 2 as primary.

now as discussed earlier what shd be my config

under bgp 1

neigbour X.X.X.X remote-as 2 route map WAN_out out

network 10.4.0.0 mask 255.255.255.0

network 10.5.0.0 mask 255.255.255.0

aggregate-address 10.4.0.0 255.255.0.0 summary-only

aggregate-address 10.5.0.0 255.255.0.0 summary-only

Now shd i use network 10.4.1.0 massk 255.255.255.0 or the one which is above is right

or shd i just redistribute EIGRP into BGP with no network statement (Man i am confused)

now two things i have to do prepend for 10.5.0.0 network and advertise only these two supernets as i have other networks which i dont want to advertised in BGP

so ip prefix-list shd be

ip prefix-list Filter seq 20 permit 10.4.0.0/16

ip prefix-list Filter seq 21 permit 10.5.0.0/16

route-map WAN_out out permit 10

match ip address prefix-list Filter

now how i will do prepend for 10.5.0.0/16 network on this router

Jon Thanks again Dude

[ozzyosbu1]

hello experts

just one doubt, for the aggregate to be announced at least one specific network should be there in the bgp table.

now as per the configuration, only one specific /24 will be there in the bgp table and if that specific goes down there wont be any more specifics in the BGP table( it will still be there on the routing table though( through IGP)). so this would mean that the aggregate will not be advertised. And no reachabilty from out side to any of the networks..!