How do I isolate a connected network from being advertised in BGP?
I am setting up a Point to Point VPN and using a public IP address on one of the interfaces on our LAN router, which is using BGP for the MPLS connections. The Network this Public address is from is located on our Border router, out side of the firewall. The problem I'm having is that the BGP on the LAN router is advertising the Public network to the inside and causing routing conflicts. I know BGP is not like EIGRP, but is there any way to set an interface to Passive, like in EIGRP, so the network is not advertised? I know I can do this in EIGRP because I've done it before. I have read just about everything I could find on the Cisco site about it and found nothing. Is there some other way I'm not seeing to achieve the same result of hiding this Public network from BGP?
How do I isolate a connected network from being advertised in BG
There is not any command in BGP equivalent to the passive-interface command in EIGRP, And there is no need for such a command in BGP because BGP works very differently from EIGRP in what it does with the network command.
In EIGRP the routing protocol process looks at the network command and looks for interfaces that match the network command and includes them in the routing process activity. And the passive-interface command is the way to say that even though the interfaces matches that it should not be active in the routing protocol.
BGP does not do this. BGP does not look at or select interfaces. What BGP does with the network command is to look in the routing table and if it finds a network in the routing table that matches the network command then BGP advertises the network.
So it seems to me that there is a simple solution for your issue. If you do not want BGP to advertise that network then remove the network command under BGP for that network.
Re: How do I isolate a connected network from being advertised i
Thank you for all the responses to my question, Let me add in some additional information. I do not have the Network for this subnet defined in the BGP table. I do have a redistribute static and a redistribute connected for advertising of the other networks. I just need to isolate the particular subnet from being advertised. I'm thinking that applying a route map to the redistribution of connected in the BGP statements, as Vasilis suggested, is going to be the way to hopefully fix this.
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