isis small-hello

Function

The isis small-hello command configures an interface to send small-sized Hello packets without the padding field.

The undo isis small-hello command cancels the configuration.

This command varies in transport and router modes. For detailed differences, see Differences Between Commands in Transport and Router Modes. This topic describes the command configuration in router mode.

By default, no small Hello packet with no padding field is configured on an interface.

Format

isis small-hello

undo isis small-hello

Parameters

None

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

By default, the rules for sending IS-IS Hello packets on P2P interfaces and broadcast interfaces are as follows:

For a P2P interface
Before the P2P neighbor relationship is established, the P2P interface sends the standard Hello packet with the padding field.
After the P2P neighbor relationship is established, the P2P interface sends the small-sized Hello packet without the padding field.
For a P2P interface, the length of padding field is equal to the length of LSP packets originate by local IS.
For a broadcast interface
It sends the standard Hello packet with the padding field.
For a broadcast interface, the length of padding field is equal to the length of MTU.
Generally, if multiple logical interfaces configured on the same interface need to establish a large number of neighbor relationships, the interface frequently sends standard Hello packets. This wastes the network bandwidth. In this case, run the isis small-hello command to save the network bandwidth.

Prerequisites

An IS-IS process has been created on a specified interface.

Precautions

The isis small-hello and isis padding-hello commands are mutually exclusive.

Example

# Configure GE 10/0 to send the Hello packets without the padding field.

<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 small-hello