3Com 3032 Configuration Manual page 470

466 C 30: C
HAPTER ONFIGURING
Configuring the
Interactions between
BGP and an IGP
BGP
peer and advertises it to other EBGP peers, it will try to check whether this
destination can be reached through its AS.
Perform the following configurations in BGP view.
Table 549 Configure Synchronization of BGP and IGP
Operation
Synchronize BGP with IGP
Prohibit synchronizing BGP with IGP
By default, BGP synchronizes with IGP.
3Com routers provide the ability to cancel BGP and IGP synchronization so the
route from IBGP can be distributed without continuously checking if the IGP route
still exists.
The synchronization of a border router can be shut down safely in the following
cases:
All the routers of an AS can form an IBGP totally-closed network. In such a
case, a route known from any border router's EBGP can be automatically
transferred to any other router through IBGP so that the connection of the AS
is insured.
When AS is not a transitional AS.
BGP can import route information that is found by running IGP in another AS to its
own AS.
Perform the following configurations in BGP view.
Table 550 Configure Route Import for BGP
Operation
Configure route import for BGP
Cancel route distribution for BGP
By default, BGP does not import routes from other domains into the routing table.
The attribute specifies the source routing domain that can be imported.
protocol
At present, BGP can import routes domain such as connected, static, RIP, OSPF and
OSPF-ASE.
See "Configure Route Import" in "Configuration of IP Routing Policy" for the
details of routing import.
The command cannot import the default route into BGP, so you
import-route
must use the
default-information
BGP.
Perform the following configurations in BGP view.
Command
synchronization
undo synchronization
Command
import-route protocol [ med med ] [
route-policy policy-name ]
undo import-route protocol
command to import the default route into