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DES-7200 Configuration Guide Chapter 6 BGP
Configuration
6-5
Sometimes, you may need to use an IGP route rather than an EBGP route. This
can be done through the network backdoor command. Execute the following
operations in the BGP configuration mode:
Command Function
DES-7200(config-router)# network
network-number mask network-mask
backdoor
(Optional) Set the backdoor route.
Use the no network network-number mask network-mask backdoor command
to remove the configuration.
Caution
By default, the management distance of the network information learned about
from the BGP Speakers which establishes the EBGP connection is 20. Set the
management distance of such network information by the network backdoor
command as 200. Hence, the identical network information learned from the
IGP presents higher priority. These networks learned from the IGP are
considered as the backdoor network, and will not be advertised.
6.5 Controlling Route Advertisement
Control route advertisement
The BGP protocol can control the routes advertised to the core routing table by
the table-map command. If a route is matched, the command modifies its
attribute and advertises it. If a route is not matched or denied, the command
advertises it without modifying its attribute.
By default, the table-map command advertises all routes without modifying their
attributes.
To configure the table-map command, execute it in the BGP configuration mode
or IPv4 address family confiugration mode:
Command Function
Router(config-router)# table-map
route-map-name
Configure the route map to be
associated.
Use the no table-map command to remove the configuration.
To bring the configuration of the table-map command into effect immediately, run
the clear ip bgp [vrf vrf-name] table-map command to update the core routing
table. The clear ip bgp [vrf vrf-name] table-map command will not clear and then
add the routes reflected in the core routing table. Instead, it directly applies the
table-map to advertise route update messages without causing forwrding
oscillation..