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S2700, S3700, S5700, S6700, S7700, and S9700 Series Switches Interoperation and Replacement Guide

This document provides typical configuration examples for interoperation between Huawei switches and mainstream IP phones, firewalls, routers, Microsoft NLB servers, multi-NIC servers, Cisco switches, and SolarWinds.
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Overview of LNP and DTP

Overview of LNP and DTP

Huawei LNP

The Link-type Negotiation Protocol (LNP) dynamically negotiates whether an Ethernet interface is the access or trunk interface. Huawei switches support LNP starting from V200R005.

Table 5-1  LNP negotiation

Local Link Type

Remote Link Type or Negotiation Status

Locally Negotiated Link Type

Final Status of the Remote Interface

Negotiation-desirable/Negotiation-auto

Access (LNP negotiation enabled)

Access

Access

Hybrid (LNP negotiation enabled)

Trunk

Hybrid

Dot1q-tunnel (LNP negotiation enabled)

Access

Dot1q-tunnel

Trunk (LNP negotiation enabled)

Trunk

Trunk

LNP negotiation not supported or disabled

Access

Uncertain

Negotiation-desirable

Negotiation-desirable

Trunk

Trunk

Negotiation-desirable

Negotiation-auto

Trunk

Trunk

Negotiation-auto

Negotiation-auto

Access

Access

NOTE:
  • The VCMP domain name affects LNP negotiation. A trunk interface is negotiated only when domain names at both ends of a link are consistent or the domain name of at least one end is empty; otherwise, an access interface is negotiated.
  • The Ethernet interface that is negotiated as an access interface joins VLAN 1 by default. The Ethernet interface that is negotiated as a trunk interface allows all VLANs by default.

Cisco DTP

The Dynamic Trunking Protocol (DTP) dynamically negotiates whether an Ethernet interface is the access or trunk interface.

Table 5-2  DTP negotiation

Configured Link Type of an Interface

Negotiated Link Type of an Interface

Switchport mode access

The interface is configured to work in access mode forcibly.

Switchport mode dynamic auto

If the remote interface works in trunk or desirable mode, the local interface works in trunk mode through negotiation.

Switchport mode dynamic desirable

If the remote interface works in trunk, desirable, or auto mode, the local interface works in trunk mode through negotiation.

Switchport mode trunk

The interface is configured to work in trunk mode forcibly.

Switchport nonegotiate

This command is used to enable the interface not to send DTP packets, and can be used on only the interface in trunk or access mode.

To establish a trunk link, you must manually configure interfaces at both ends to work in trunk mode.

NOTE:
  • Devices at both ends must have the same VTP domain name to ensure successful DTP negotiation.
  • DTP supports the Inter-Switch Link (ISL) and IEEE 802.1Q. ISL is a Cisco proprietary encapsulation protocol, and IEEE 802.1Q is a standard protocol.
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Updated: 2019-05-15

Document ID: EDOC1000114005

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