Netgear XCM8806 Chassis User Manual - Page 712
Using the Loopback Interface, Enabling and Disabling Route Origination
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NETGEAR 8800 User Manual Enabling and Disabling Route Origination To enable or disable BGP default route origination and advertisement for BGP neighbors, use the following commands: enable bgp [{neighbor} | neighbor all] {address-family [ipv4-unicast | ipv4-multicast]} originate-default {policy } disable bgp [{neighbor} | 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} {address-family [ipv4-unicast | ipv4-multicast]} originate-default {policy } disable bgp {peer-group} {address-family [ipv4-unicast | ipv4-multicast]} originate-default Example: Default Route Origination 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 712 | Chapter 26. BGP
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