Huawei Quidway S6500 Series Operation Manual page 188

Operation Manual - Routing Protocol
Quidway S6500 Series Ethernet Switches
reach the corresponding ASBR from the local router + cost to reach the destination
address of the route from the ASBR
The external routes type-2 refer to the imported EGP routes. Since these routes have
lower credibility, OSPF assumes that the cost spent from the ASBR to reach the
destinations beyond the AS is greatly higher than that spent from within the AS to the
ASBR. So in route cost calculation, the former is mainly considered, that is, the cost
spent to reach the external route type 2 = cost spent to the destination address of the
route from the ASBR. If the two values are equal, then the cost of the router to the
corresponding ASBR will be considered.
Perform the following configuration in OSPF view.
Table 4-21 Configuring OSPF to Import Routes of Other Protocols
Configure OSPF to import routes of
other protocols
Cancel importing routing information of
other protocols
By default, OSPF will not import the routing information of other protocols. The default
type of the imported route is 2, cost is 1, and tag is 1.
protocol specifies a source routing protocol that can be imported. By far, it can be Direct,
Static, RIP, IS-IS or BGP.
Note:
You are recommended to configure both the route type, cost and tag together in one
command; otherwise, the new configuration overwrites the old one.
4.2.22 Configuring Parameters for OSPF to Import External Routes
When the OSPF imports the routing information discovered by other routing protocols
in the autonomous system, some additional parameters need configuring, such as
default route cost and default tag of route distribution, etc. Route ID can be used to
identify the protocol-related information. For example, OSPF can use it to identify the
AS number when receiving BGP.
Perform the following configuration in OSPF view.
Operation
Huawei Technologies Proprietary
4-20
Chapter 4 OSPF Configuration
Command
import-route protocol [ cost value |
type value | tag value | route-policy
route-policy-name ]*
undo import-route protocol