The isis small-hello command configures an interface to send Hello packets without the padding field.
The undo isis small-hello command removes the configuration.
By default, an interface is not configured with the isis small-hello command.
Ethernet interface view, Ethernet sub-interface view, Eth-Trunk interface view, Eth-Trunk sub-interface view, Tunnel interface view, Loopback interface view, Dialer interface view, VLANIF interface view, Virtual-Template interface view
The command can be used to simplify the operations of sending and receiving Hello packets.
The isis padding-hello and isis small-hello commands are mutually exclusive and therefore cannot be configured on the same interface simultaneously.
For the interface that is not configured with the two commands, it sends Hello packets based on the following rules:
For a 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 broadcast interface
It sends Hello packets with the padding field.