3Com 10014299 manual By default, BGP synchronizes with IGP, Still exists, Interactions between

466CHAPTER 30: CONFIGURING 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	Command
	Synchronize BGP with IGP	synchronization
	Prohibit synchronizing BGP with IGP	undo synchronization
	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.
Configuring the	BGP can import route information that is found by running IGP in another AS to its
Interactions between	own AS.
BGP and an IGP	Perform the following configurations in BGP view.
	Table 550 Configure Route Import for BGP
	Operation	Command
	Configure route import for BGP	import-route protocol [ med med ] [
		route-policy policy-name]
	Cancel route distribution for BGP	undo import-route protocol

By default, BGP does not import routes from other domains into the routing table.

The protocol attribute specifies the source routing domain that can be imported.

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 import-routecommand cannot import the default route into BGP, so you must use the default-informationcommand to import the default route into BGP.

Perform the following configurations in BGP view.