Netgear XCM8806 - 8800 SERIES 6-SLOT CHASSIS SWITCH 사용자 설명서

To enable or disable BGP default route origination and advertisement for BGP neighbors, use 
the following commands:

enable bgp [{neighbor} <remoteaddr> | neighbor all] {address-family 

[ipv4-unicast | ipv4-multicast]} originate-default {policy <policy-name>}

disable bgp [{neighbor} <remoteaddr> | neighbor all] {address-family 

[ipv4-unicast | ipv4-multicast]} originate-default

To enable or disable BGP default route origination and advertisement for a BGP peer group, 
use the following commands:

enable bgp {peer-group} <peer-group-name> {address-family [ipv4-unicast | 

ipv4-multicast]} originate-default {policy <policy-name>}

disable bgp {peer-group} <peer-group-name> {address-family [ipv4-unicast | 

ipv4-multicast]} originate-default

The following example configures the originate default route feature for BGP neighbor 
10.203.134.5 using policy def_originate.pol.

def_originate.pol

entry prefix_matching {

    if match any {

        nlri 192.168.3.0/24;

    } then {

        as-path "65001";

        permit;

    }

}

enable bgp neighbor 10.203.134.5 originate-default policy def_originate

With this configuration, a default route is originated and sent to neighbor 10.203.134.5 only if 
there is a BGP route in the local RIB which matches the statement 

nlri 192.168.3.0/24

. If a 

matching route exists, the default route is sent to neighbor 10.203.134.5 with the 

65001

 

as-path prepended. If this is an EBGP neighbor, then the local AS-Number is prepended after 
65001.

If the route for the match statement 

nlri 192.168.3.0/24

 goes away and there is no other 

matching route in the BGP RIB, the default route origination feature becomes inactive and 
BGP withdraws the 0.0.0.0/0 default route from neighbor 10.203.134.5. When a matching 
route becomes available again in the local BGP RIB, the default route origination feature 
becomes active again and the default route 0.0.0.0/0 is advertised to neighbor 10.203.134.5.

Using the Loopback Interface

If you are using BGP as your IGP, you may decide to advertise the interface as available, 
regardless of the status of any particular interface. The loopback interface can also be used