isis dis-priority

Function

The isis dis-priority command sets a priority for an interface to run for the DIS on a specified level.

The undo isis dis-priority command restores the default priority.

By default, the DIS priority of an IS-IS interface is 64.

Format

isis dis-priority priority [ level-1 | level-2 ]

undo isis dis-priority [ priority ] [ level-1 | level-2 ]

Parameters

Parameter	Description	Value
priority	Specifies a priority for DIS election.	The value is an integer that ranges from 0 to 127.
level-1	Specifies a priority for Level-1 DIS election.	-
level-2	Specifies a priority for Level-2 DIS election.	-

Parameter

Description

Value

priority

Specifies a priority for DIS election.

The value is an integer that ranges from 0 to 127.

level-1

Specifies a priority for Level-1 DIS election.

level-2

Specifies a priority for Level-2 DIS election.

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, Global VE sub-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

On a broadcast network, IS-IS needs to elect a DIS from all devices. If there are Level-1 and Level-2 devices on this network, Level-1 and Level-2 DISs are elected separately and can be the same device or different devices.

The DIS is elected as follows: The device whose IS-IS interface has the highest DIS priority is elected as the DIS; If the interfaces on multiple devices have the same DIS priority, the device whose interface has the largest MAC address is elected as the DIS.

The isis dis-priority command can be used to set a DIS Priority for an IS-IS interface.

Prerequisites

An IS-IS process has been created, and the IS-IS process has been started on a specified interface.

Configuration Impact

If neither Level-1 nor Level-2 is specified in the command, the same priority is set for Level-1 and Level-2 DISs.

After the isis dis-priority command is run, the DIS priority is advertised in Hello packets.

Precautions

The command takes effect only on the broadcast network.

If an Ethernet interface is simulated as a P2P interface using the isis circuit-type command, the isis dis-priority command does not take effect on the Ethernet interface.

This command takes effect for both IPv4 and IPv6 interfaces.

Example

# Set the DIS priority of Gigabit Ethernet 0/1/0 to 127.

<HUAWEI> system-view
[~HUAWEI] isis 1
[*HUAWEI-isis-1] quit
[*HUAWEI] interface GigabitEthernet 0/1/0
[*HUAWEI-GigabitEthernet0/1/0] isis enable 1
[*HUAWEI-GigabitEthernet0/1/0] isis dis-priority 127 level-2