isis circuit-level

Format

isis circuit-level [ level-1 | level-2 | level-1-2 ]

undo isis circuit-level

Parameters

Parameter	Description	Value
level-1	Indicates the Level-1 link type. After the parameter is configured, the interface can set up only Level-1 adjacencies.	-
level-2	Indicates the Level-2 link type. After the parameter is configured, the interface can set up only Level-2 adjacencies.	-
level-1-2	Indicates the Level-1-2 link type. After the parameter is configured, the interface can set up both Level-1 and Level-2 adjacencies.	-

Parameter

Description

Value

level-1

Indicates the Level-1 link type. After the parameter is configured, the interface can set up only Level-1 adjacencies.

-

level-2

Indicates the Level-2 link type. After the parameter is configured, the interface can set up only Level-2 adjacencies.

-

level-1-2

Indicates the Level-1-2 link type. After the parameter is configured, the interface can set up both Level-1 and Level-2 adjacencies.

-

Views

100GE interface view, 10GE interface view, 25GE sub-interface view, 25GE interface view, 400GE interface view, 40GE interface view, 50GE sub-interface view, 50GE interface view, Eth-Trunk interface view, FlexE interface view, GE optical interface view, GE electrical interface view, GMPLS-UNI interface view, Global VE sub-interface view, Loopback interface view, Tunnel interface view, VBDIF interface view, VE sub-interface view, VE interface view, VLANIF interface view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
isis	write

Usage Guidelines

Usage Scenario

When an adjacency is established between a Level-1-2 router and a remote device, the Level-1-2 router sends and receives both Level-1 and Level-2 Hello packets, wasting bandwidth and memory resources. To solve this problem, run the isis circuit-level command to set a specified link type for an interface on the Level-1-2 router.

Prerequisites

IS-IS has been enabled using the isis enable command in the interface view.

Configuration Impact

Network flapping may occur if the link type of an IS-IS interface is changed during network operation. Therefore, setting a link type when configuring IS-IS is recommended.

Precautions

The link type takes effect only when the system type of IS-IS is Level-1-2. Otherwise, the level defined by the is-level command is used.

Example

# Set the link type of GE 0/1/0 that is connected to a non-backbone device in the same area to Level-1 to prevent GE 0/1/0 from receiving and sending Level-2 Hello packets.

<HUAWEI> system-view
[~HUAWEI] isis 1
[*HUAWEI-isis-1] quit
[*HUAWEI] interface GigabitEthernet 0/1/0
[*HUAWEI-GigabitEthernet0/1/0] isis enable
[*HUAWEI-GigabitEthernet0/1/0] isis circuit-level level-1