ipv6 import-route (IS-IS view)

Function

The ipv6 import-route command enables IS-IS to import IPv6 routes from other protocols.

The undo ipv6 import-route command disables IS-IS from importing IPv6 routes from other protocols.

By default, IS-IS does not import IPv6 routes from other protocols.

Format

ipv6 import-route { direct | static | unr | { ospfv3 | ripng | isis } [ process-id ] | bgp } [ cost cost | tag tag | { route-policy route-policy-name | route-filter route-filter-name } | [ level-1 | level-2 | level-1-2 ] ] ^*

ipv6 import-route { { ospfv3 | ripng | isis } [ process-id ] | bgp | direct | unr } inherit-cost [ { level-1 | level-2 | level-1-2 } | tag tag | { route-policy route-policy-name | route-filter route-filter-name } ] ^*

undo ipv6 import-route { direct | static | unr | { ospfv3 | ripng | isis } [ process-id ] | bgp }

Parameters

Parameter	Description	Value
direct	Imports direct routes.	-
static	Imports static routes.	-
unr	Imports UNR routes.	-
ospfv3	Imports OSPFv3 routes.	-
ripng	Imports RIPng routes.	-
isis	Imports IS-IS routes. Before you specify this parameter, enable an IS-IS process with a. process-id different from the local one.	-
process-id	Specifies the process ID of the imported protocol.	The value is an integer ranging from 1 to 4294967295. The default value is 1.
bgp	Imports BGP routes.	-
cost cost	Specifies a cost for the imported route.	The value ranges from 0 to 4261412864, regardless of cost types.
tag tag	Assigns administrative tags to the imported routes.	The value is an integer ranging from 1 to 4294967295.
route-policy route-policy-name	Specifies the name of a route-policy.	The name is a string of 1 to 200 case-sensitive characters, with spaces not supported. When double quotation marks are used around the string, spaces are allowed in the string.
route-filter route-filter-name	Specifies the name of route filter policy. The policy is used to filter the imported routes so that only some of the routes of other routing domains can be imported.	The value is a string of 1 to 200 case-sensitive characters, spaces not supported. If parameters are included in the referenced route-filter, specify values for them in the format of (var1, var2, ...var8) behind the route-filter name. A maximum of eight parameters can be specified, and each value ranges from 1 to 200 characters.
level-1	Imports routes to the Level-1 routing table.	-
level-2	Imports routes to the Level-2 routing table.	-
level-1-2	Imports routes to Level-1 and Level-2 routing tables. If no level is specified in the command, routes are imported to the Level-2 routing table by default.	-
inherit-cost	Retains the original cost of the imported route. If this parameter is specified, you cannot configure the cost and cost type for the routes imported by IS-IS.	-

Views

IS-IS view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
isis	write

Usage Guidelines

Usage Scenario

When IS-IS and other routing protocols are deployed on a network, you can enable the traffic within an IS-IS domain to reach a destination outside the IS-IS domain using either of the following methods:

Run the ipv6 default-route-advertise command to configure boundary devices in the IS-IS domain to advertise default routes to the IS-IS domain.
Run the ipv6 import-route command to configure boundary devices in the IS-IS domain to import routes from other routing domains into the IS-IS domain.
If there are multiple boundary devices in the IS-IS domain, optimal routes destined for another routing domain need to be selected. This requires all devices in the IS-IS domain learn all or some external routes.
When the routes of other protocols are imported, you can set the cost values and types for the imported routes be specifying cost. You can also configure IS-IS to retain the original cost values of the imported routes by specifying inherit-cost. If you do not specify either cost or inherit-cost, the cost of the imported routes is 0.

Prerequisites

An IS-IS process has been created using the isis command, and the IPv6 has been enabled on IS-IS process using the ipv6 enable command.

Configuration Impact

The imported routes may lead to a routing loop. Therefore, exercise caution. Using a routing policy to filter imported routes is recommended.

Example

# Configure IS-IS to import a static route and set the cost for the imported route to 15.

<HUAWEI> system-view
[~HUAWEI] isis
[*HUAWEI-isis-1] ipv6 enable
[*HUAWEI-isis-1] ipv6 import-route static cost 15