Null interface drop packets

[ignatvazhenin]

Hello,

l need to advertise by BGP two host IP addresses for example 1.1.1.33/24 and 1.1.1.34/24, they belong one subnet /24, terminating on subinterface. I need to advertise 1.1.1.33/24 to one bgp peer, 1.1.1.34/24 to another bgp peer, but in routing table i have only active route 1.1.1.0/24 terminating on subinterface. l can not use route-map to separate routes to different bgp peers, i tried to use static route with NULL interface to make routes 1.1.1.33/24 and 1.1.1.34/24 active in routing table to use route-map. Now l can use route-map to separate routes to different bgp peers but reverse traffic to 1.1.1.33/24, 1.1.1.34/24 drop ( because routes pointed to NULL interface ). How can l make IP address 1.1.1.33/24, 1.1.1.34/24 active in routing table to use route-map to different BGP peers ?

Thank you !

[MHM Cisco World]

Config static route to null0 with high AD.

[Jon Marshall]

Won't make any difference as most specific prefix always wins so they would still be entered in routing table. 

Jon

[MHM Cisco World]

As @Jon Marshall  suggest 

Config static host route toward subinterface,

And advertise the route as static not as connect in bgp.

[Jon Marshall]

Instead of the next hop being the null interface make the next hop the outgoing interface on the router. 

Jon

[ignatvazhenin]

I need to save ip connectivity for IP address 1.1.1.33, 1.1.1.34. I mean now ip hosts 1.1.1.33, 1.1.1.34 communicate with IP remote site through gateway 1.1.1.1 terminating on subinterface ( 1.1.1.1/24 ), so if I add static route for hosts 1.1.1.33, 1.1.1.34 through other interface -> traffic from 1.1.1.33, 1.1.1.34 will forward to another next hop, different from 1.1.1.1, so ip connectivity to IP remote site will be terminated

[Jon Marshall]

You don't use other interface, you use the interface that has the 1.1.1.1 IP. 

Jon

[ignatvazhenin]

I tried to do this, but there was configuration error

[MHM Cisco World]

please share the show ip route, show static route.
And if I right this second post for same issue which is /32 with "L" in routing table ?

[ignatvazhenin]

When I apply configuration of static route 1.1.1.33/1.1.1.34 to next hop 1.1.1.1, I receive error of mismatch configuration with interface where 1.1.1.1/24 is already configured ( terminating )

[Jon Marshall]

You don't set the next hop to be 1.1.1.1, you set the next hop to be the interface that 1.1.1.1 is assigned to. 

Jon

[MHM Cisco World]

Are this issue solved or not? Do you try @Jon Marshall  suggestion ?

[ignatvazhenin]

I haven’t got option to use as next-hop interface, where assigned ip address 1.1.1.1, only IP address/hostname:

configure mode commands/options:

  Hostname or A.B.C.D  The address of the gateway by which the foreign network is reached