topology (IS-IS view)

Function

The topology command associates an IPv4 topology instance with an IS-IS instance and displays the IPv4 IS-IS topology instance view.

The undo topology command dissociates an IPv4 topology instance from an IS-IS instance.

By default, no IS-IS instance is associated with any IPv4 topology instance.

Format

topology topology-name [ topology-id { mt-id | multicast } ]

undo topology topology-name

Parameters

Parameter	Description	Value
topology-name	Specifies the name of a topology instance.	The value is a string of 1 to 31 case-sensitive characters without spaces. The value must start with a letter (a to z or A to Z, case sensitive) and can contain numbers, hyphens (-), or underlines (_). When double quotation marks are used around the string, spaces are allowed in the string.
topology-id mt-id	Specifies the ID of a topology instance.	The value is an integer ranging from 6 to 4095. The IDs from 0 to 5 are reserved for specific topologies.
multicast	Associates an IS-IS instance with an IPv4 multicast topology.	-

Parameter

Description

Value

topology-name

Specifies the name of a topology instance.

The value is a string of 1 to 31 case-sensitive characters without spaces. The value must start with a letter (a to z or A to Z, case sensitive) and can contain numbers, hyphens (-), or underlines (_). When double quotation marks are used around the string, spaces are allowed in the string.

topology-id mt-id

Specifies the ID of a topology instance.

The value is an integer ranging from 6 to 4095. The IDs from 0 to 5 are reserved for specific topologies.

multicast

Associates an IS-IS instance with an IPv4 multicast topology.

Views

IS-IS view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
isis	write

Usage Guidelines

Usage Scenario

The IS-IS multi-topology enables the operation of multiple independent logical topologies in an IS-IS AS. The topology command can be used to associate an IPv4 topology instance with an IS-IS instance.

When using topology command to associate an IPv4 topology instance with an IS-IS instance, you need to specify topology-name and mt-id, and ensure that the specified topology name or topology ID is unique.

To enter the view of an existing topology, specify only topology-name.

Prerequisites

An IPv4 topology instance has been created using the ip topology command, and an IS-IS instance has been created using the isis command.

Follow-up Procedure

Run the isis topology command in the specified interface view to associate the interface with the IS-IS topology instance.

Precautions

The topology IDs from 0 to 5 are reserved for specific topologies and cannot be used by other topologies. These topology IDs are described as follows:

0: is reserved for an IPv4 base topology. The name of the IPv4 base topology is base and cannot be used by other topologies.
1: is reserved for IPv4 inband management.
2: is reserved for an IPv6 base topology that is enabled using the ipv6 topology command.
3: is reserved for the IPv4 multicast topology named multicast only. The value of mt-id must be multicast. The topology multicast topology-id multicast command is used to enable the IPv4 multicast topology.
4: is reserved for the IPv6 multicast topology named multicast only. The value of mt-id must be multicast. The ipv6 topology multicast topology-id multicast command is used to enable the IPv6 multicast topology.
5: is reserved for IPv6 inband management.
Before you enable multi-topology for an IS-IS process, use the cost-style command in IS-IS view to set the cost type of IS-IS packets to wide, compatible, or wide-compatible.

Example

# Associate IS-IS instance 1 with the IPv4 topology instance named red and the topology ID 10.

<HUAWEI> system-view
[~HUAWEI] ip topology red
[*HUAWEI] isis 1
[*HUAWEI-isis-1] cost-style wide
[*HUAWEI-isis-1] topology red topology-id 10