Interoperation and Replacement Guide for Huawei LNP and Cisco DTP

• Overview of LNP and DTP
  
• Comparison Between LNP and DTP
  
• Interoperation and Replacement Solution for LNP and DTP
  
• Interoperation and Replacement Solution 1: Replacement Solution on the Entire Network
  
• Interoperation and Replacement Solution 2: Replacement Solution of a Single Device
  

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 2-101  LNP negotiation

 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 2-102  DTP negotiation

 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.

Comparison Between LNP and DTP

Table 2-103  Function support

Table 2-104  Differences in command formats

Interoperation and Replacement Solution for LNP and DTP

DTP and LNP are both proprietary protocols, so they cannot interwork. The two protocols can replace each other. Select either of the following solutions depending on the actual scenario:

• Network-wide replacement: All Cisco DTP switches are replaced by Huawei switches that support LNP.
• Single replacement: One Cisco switch is replaced by a Huawei S series switch. The remote switch is still a Cisco switch. In this situation, you need to configure the interface of the remote Cisco switch to work in non-negotiation mode.

Interoperation and Replacement Solution 1: Replacement Solution on the Entire Network

Topic contents:

• Overview
• Configuration Notes
• Networking Requirements
• Configuration Roadmap
• Procedure
• Configuration Files

Overview

Network-wide replacement indicates that all Cisco DTP switches are replaced by Huawei switches that support LNP. The following describes the configuration of Huawei LNP.

Configuration Notes

• This example applies to Huawei switches of V200R005 and later versions.
• On Huawei switches, LNP is used globally and on interfaces by default. The interface that is negotiated as an access interface joins VLAN 1 by default, and the interface that is negotiated as a trunk interface joins all VLANs by default. Generally, you only need to change the VLAN configuration on an interface based on the networking.

Networking Requirements

In Figure 2-69, terminal users are connected to the network through switches. To implement Layer 2 connectivity, configure the link type on each interface and add interfaces to VLANs. If the network scale is large, the configuration is very complex. To simplify configurations, switches are connected through the trunk link, and switches and user terminals are connected through access links and added to VLANs.

Figure 2-69  Networking for configuring LNP to implement auto-negotiation of the link type of an Ethernet interface 

Configuration Roadmap

1. Enable LNP in the system view and interface view to implement auto-negotiation of the link type of an interface. Because PCs do not support LNP, so switch interfaces connected to terminals are used as access interfaces and interfaces between switches are used as trunk interfaces through negotiation.
2. Add interfaces to VLANs to implement Layer 2 connectivity.

Procedure

1. Enable global LNP.

   By default, global LNP is enabled. If LNP is disabled, run the undo lnp disable command in the system view to enable it.

2. Create VLANs.

   Huawei switches support two VLAN creation modes:

   • Manually create VLANs on switches.
   • Create VLANs on Switch3 only and configure VCMP to synchronize VLANs on Switch3 to other switches. If VCMP is used to create VLANs, configure Switch3 as the VCMP server and Switch1 and Switch2 as VCMP clients. For details, see "VCMP Configuration."

   The following describes how to manually create VLANs.

   # Create VLAN 10 and VLAN 20 on Switch1, Switch2, and Switch3.

   <HUAWEI> system-view [HUAWEI] sysname Switch1 [Switch1] vlan batch 10 20

   <HUAWEI> system-view [HUAWEI] sysname Switch2 [Switch2] vlan batch 10 20

   <HUAWEI> system-view [HUAWEI] sysname Switch3 [Switch3] vlan batch 10 20

3. Enable LNP on interfaces, and add switch interfaces connected to PCs to VLANs as access interfaces and interfaces between switches to VLANs as trunk interfaces.

   By default, LNP on an interface is enabled. If LNP is disabled, run the undo port negotiation disable command in the interface view to enable it.

   # Configure Switch1.

   [Switch1] interface GigabitEthernet 0/0/1 [Switch1-GigabitEthernet0/0/1] port default vlan 10  //The interface connected to a PC is an access interface. Run this command to configure the VLAN that the interface joins. [Switch1-GigabitEthernet0/0/1] quit [Switch1] interface GigabitEthernet 0/0/2 [Switch1-GigabitEthernet0/0/2] port trunk allow-pass only-vlan 10 20  //The interface connected to a switch is negotiated as a trunk interface. Run this command to configure the VLANs that the interface joins. This command configures the interface to allow packets from VLAN 10 and VLAN 20. [Switch1-GigabitEthernet0/0/2] quit [Switch1] interface GigabitEthernet 0/0/3 [Switch1-GigabitEthernet0/0/3] port default vlan 20 [Switch1-GigabitEthernet0/0/3] quit

   # Configure Switch2.

   [Switch2] interface GigabitEthernet 0/0/1 [Switch2-GigabitEthernet0/0/1] port default vlan 10 [Switch2-GigabitEthernet0/0/1] quit [Switch2] interface GigabitEthernet 0/0/2 [Switch2-GigabitEthernet0/0/2] port trunk allow-pass only-vlan 10 20 [Switch2-GigabitEthernet0/0/2] quit [Switch2] interface GigabitEthernet 0/0/3 [Switch2-GigabitEthernet0/0/3] port default vlan 20 [Switch2-GigabitEthernet0/0/3] quit

   # Configure Switch3.

   [Switch3] interface GigabitEthernet 0/0/1 [Switch3-GigabitEthernet0/0/1] port trunk allow-pass only-vlan 10 20 [Switch3-GigabitEthernet0/0/1] quit [Switch3] interface GigabitEthernet 0/0/2 [Switch3-GigabitEthernet0/0/2] port trunk allow-pass only-vlan 10 20 [Switch3-GigabitEthernet0/0/2] quit

4. Verify the configuration.

   After the preceding configuration is complete, run the display lnp interface interface-type interface-number command to check auto-negotiation on the specified Layer 2 interface.

   [Switch1] display lnp interface gigabitethernet0/0/2 LNP information for GigabitEthernet0/0/2:   Port link type: trunk   Negotiation mode: desirable   Hello timer expiration(s): 7   Negotiation timer expiration(s): 0   Trunk timer expiration(s): 278   FSM state: trunk   Packets statistics   56 packets received     0 packets dropped       bad version: 0, bad TLV(s): 0, bad port link type: 0,       bad negotiation state: 0, other: 0   58 packets output     0 packets dropped       other: 0

   Run the display lnp summary command to check auto-negotiation information on all interfaces of the Layer 2 device.

   [Switch1] display lnp summary Global LNP : Negotiation enable ------------------------------------------------------------------------------- C: Configured; N: Negotiated; *: Negotiation disable; Port         link-type(C)   link-type(N)   InDropped   OutDropped  FSM          ------------------------------------------------------------------------------- GE0/0/1      desirable      access         0           0           access GE0/0/2      desirable      trunk          0           0           trunk GE0/0/3      desirable      access         0           0           access

Configuration Files

• Switch1 configuration file

  # sysname Switch1 # vlan batch 10 20 # interface GigabitEthernet0/0/1  port default vlan 10 # interface GigabitEthernet0/0/2  port trunk allow-pass only-vlan 10 20 # interface GigabitEthernet0/0/3  port default vlan 20 # return

• Switch2 configuration file

  # sysname Switch2 # vlan batch 10 20 # interface GigabitEthernet0/0/1  port default vlan 10 # interface GigabitEthernet0/0/2  port trunk allow-pass only-vlan 10 20 # interface GigabitEthernet0/0/3  port default vlan 20 # return

• Switch3 configuration file

  # sysname Switch3 # vlan batch 10 20 # interface GigabitEthernet0/0/1  port trunk allow-pass only-vlan 10 20 # interface GigabitEthernet0/0/2  port trunk allow-pass only-vlan 10 20 # return

Interoperation and Replacement Solution 2: Replacement Solution of a Single Device

Topic contents:

• Overview
• Configuration Notes
• Networking Requirements
• Configuration Roadmap
• Procedure

Overview

When replacing a single device, you need to configure the connected interface of the Cisco device as non-negotiation.

Configuration Notes

• This example applies to all versions of S series switches.
• During interworking and replacement of Cisco switches and Huawei switches, the encapsulation mode must be IEEE 802.1Q.

Networking Requirements

In Figure 2-70, three Cisco devices use DTP to dynamically negotiate link types of interfaces. One device is replaced by a Huawei S series switch, and the three switches need to implement Layer 2 connectivity.

Figure 2-70  Interworking of Huawei switches and Cisco switches 

Configuration Roadmap

1. Manually configure link types of interfaces. DTP on Cisco switches and LNP on Huawei switches are both proprietary protocols, and cannot interwork. When Huawei switches are connected to Cisco switches, the link type of an interface cannot be negotiated dynamically.
2. Manually configure link types of interfaces on two switches as trunk and specify the packet encapsulation mode on Cisco switches as IEEE 802.1Q.

Procedure

1. Manually change the link type of Fa0/2 on the Cisco switch to trunk. The configuration of two Cisco switches is the same.

   CiscoA# configure terminal CiscoA(config)# interface fastEthernet 0/2 CiscoA(config-if)# switchport trunk encapsulation dot1q CiscoA(config-if)# switchport mode trunk  //An interface on a Cisco switch joins all VLANs by default, and does not need to be configured manually.

2. Configure the link type of the interface on the Huawei S series switch as trunk.

   <Huawei> system-view [Huawei] interface GigabitEthernet0/0/2 [Huawei-GigabitEthernet0/0/2] port link-type trunk [Huawei-GigabitEthernet0/0/2] port trunk allow-pass vlan 2 to 4094  //When the link type of an interface of a Huawei S series switch is configured as trunk, the interface joins VLAN 1 by default. You need to manually add the interface to VLANs 2 to 4094. 

3. Verify the configuration.
   • Run the show interfaces fastEthernet 0/2 switchport command to check whether the link type field on the Cisco switch is Administrative Mode: trunk.
   • Run the display interface gigabitethernet 0/0/2 command to check whether the link type field on the Cisco switch is Link-type: trunk(configured).

See more please click 

https://support.huawei.com/enterprise/en/doc/EDOC1000069520/9aadccc0/comprehensive-configuration-examples