Problem with BGP advertise on NE20 router. We advertising the network X.X.57.0/24 to the peer by configuration. We connect to Ethernet 1/0/1 with this network X.X.57.0/29 and we can not ping external network over this interface(IP address of PC which connected to this interface is X.X.57.1 and gateway X.X.57.6). But we can ping from router directly. When we change IP address of Ethernet 1/0/1 to X.X.57.6/24 it can ping from PC also.
BGP protocol can not advertising the route which is not exist on the routing table even if we will advertising it in the configuration of BGP. For solving this problem we need add one route to null interface. So for solving this problem I added the route like before but send it to null interface (X.X.57.0 24 null).
I have add one rout “ip rout X.X.57.0 24 eth 1/0/1” and after this it can ping also from X.X.57.6/29. But this solution is not convenient for costumer. Because they will not send all of this network to one interface.
Dynamic routing protocol can advertise the route which is in the routing table. Need pay more attention to this detail.