Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 92)

64 Multi-Service IronWare Routing Configuration Guide
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Using the IP default route as a valid next-hop for a BGP4 route
The route-map map-name parameter specifies the name of the route map you want to use to set or
change BGP4 attributes for the network you are advertising. The route map must already be
configured. If it is not, the default action is to deny redistribution.
The weight num parameter specifies a weight to be added to routes to this network.
The backdoor parameter changes the administrative distance of the route to this network from the
EBGP administrative distance (20 by default) to the Local BGP4 weight (200 by default), tagging
the route as a backdoor route. Use this parameter when you want the device to prefer IGP routes
such as RIP or OSPF routes over the EBGP route for the network.
Specifying a route map when configuring BGP4
network advertising
You can specify a route map when you configure a BGP4 network to be advertised. The device uses
the route map to set or change BGP4 attributes when creating a local BGP4 route.
NOTE
You must configure the route map before you can specify the route map name in a BGP4 network
configuration; otherwise, the route is not imported into BGP4.
To configure a route map, and use it to set or change route attributes for a network you define for
BGP4 to advertise, enter commands such as the following.
Brocade(config)# route-map set_net permit 1
Brocade(config-routemap set_net)# set community no-export
Brocade(config-routemap set_net)# exit
Brocade(config)# router bgp
Brocade(config-bgp)# network 10.100.1.0/24 route-map set_net
The first two commands in this example create a route map named “set_net” that sets the
community attribute for routes that use the route map to “NO_EXPORT”. The next two commands
change the CLI to the BGP4 configuration level. The last command configures a network for
advertising from BGP4, and associates the “set_net” route map with the network. When BGP4
originates the 10.100.1.0/24 network, BGP4 also sets the community attribute for the network to
“NO_EXPORT”.
For more information, refer to “ “Defining route maps” on page 81.
Using the IP default route as a valid next-hop
for a BGP4 route
By default, the device does not use a default route to resolve a BGP4 next-hop route. If the IP route
lookup for the BGP4 next-hop does not result in a valid IGP route (including static or direct routes),
the BGP4 next-hop is considered to be unreachable and the BGP4 route is not used.
In some cases, such as when the device is acting as an edge device, you can allow the device to
use the default route as a valid next-hop. To do so, enter the following command at the BGP4
configuration level of the CLI.
Brocade(config-bgp)# next-hop-enable-default
Syntax: [no] next-hop-enable-default