The mtu-signalling command enables Label Mapping messages to carry an MTU TLV and determines the MTU TLV type.
The undo mtu-signalling command disables Label Mapping messages from carrying an MTU TLV.
The undo mtu-signalling apply-tlv command restores the default type of MTU TLV carried in Label Mapping messages to be sent.
By default, the Router with MPLS LDP globally enabled sends Label Mapping messages carrying the MTU TLV, in compliance with draft-ietf-mpls-ldp-mtu-extensions.
| Parameter | Description | Value |
|---|---|---|
| apply-tlv |
Indicates the type of MTU TLV carried in Label Mapping messages to be sent. After this parameter is configured, the implementation is in compliance with relevant RFC standards. If this parameter is not configured, the implementation is in compliance with draft-ietf-mpls-ldp-mtu-extensions. |
- |
Usage Scenario
If different types of links on an MPLS network support different MTU values, this function enables devices to negotiate MTU values, prevents packets from being discarded if the packet size exceeds an MTU.
Precautions
By default, after MPLS LDP is globally enabled, a device sends Label Mapping messages carrying an MTU TLV in compliance with draft-ietf-mpls-ldp-mtu-extensions. If an LDP peer does not identify the MTU TLV carried in a received message, the peer must process the TLV as an unknown TLV defined in relevant RFC standards.