isis small-hello
Function
The isis small-hello command configures an IS-IS interface to send Hello packets without the padding field.
The undo isis small-hello command restores the default setting.
By default, an IS-IS interface is not configured to send Hello packets without the padding field.
Usage Guidelines
The command can simplify the operations of sending and receiving Hello packets.
The isis small-hello and isis padding-hello commands are mutually exclusive and cannot be configured on the same interface simultaneously.
If an interface is not configured with the two commands, it sends Hello packets based on the following rules:
P2P interface
Before the P2P neighbor relationship is established, the P2P interface sends Hello packets with the padding field.
After the P2P neighbor relationship is established, the P2P interface sends Hello packets without the padding field.
For a P2P interface, the length of the padding field is equal to the length of LSP packets generated by the local IS.
Broadcast interface
The interface sends Hello packets with the padding field.
For a broadcast interface, the length of padding field is equal to the length of MTU.
Before running this command on an interface, run the isis enable command on the interface to enable IS-IS.
Example
# Configure VLANIF100 to send Hello packets without the padding field.
<HUAWEI> system-view [HUAWEI] isis [HUAWEI-isis-1] network-entity 01.0000.0000.0001.00 [HUAWEI-isis-1] quit [HUAWEI] interface vlanif 100 [HUAWEI-Vlanif100] isis enable 1 [HUAWEI-Vlanif100] isis small-hello
# Configure GE0/0/1 to send Hello packets without the padding field.
<HUAWEI> system-view [HUAWEI] isis [HUAWEI-isis-1] network-entity 01.0000.0000.0001.00 [HUAWEI-isis-1] quit [HUAWEI] interface gigabitethernet 0/0/1 [HUAWEI-GigabitEthernet0/0/1] undo portswitch [HUAWEI-GigabitEthernet0/0/1] isis enable 1 [HUAWEI-GigabitEthernet0/0/1] isis small-hello