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NE20E-S2 V800R010C10SPC500 Configuration Guide - IP Services 01

This is NE20E-S2 V800R010C10SPC500 Configuration Guide - IP Services
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Configure L2VPN MTU Negotiation

Configure L2VPN MTU Negotiation

As defined in relevant standards, nodes negotiate MTU values before they establish virtual circuits (VCs) or pseudo wires (PWs) on Layer 2 virtual private networks (L2VPNs), such as pseudo wire emulation edge-to-edge (PWE3), virtual leased line (VLL), and virtual private LAN service (VPLS) networks. An MTU inconsistency will cause two nodes to fail to establish a VC or PW.

Type MTU Configuration Methods MTU Value Selection Rules
PWE3
  • Specify MTU parameter in the mpls switch-l2vc command.
  • Configure the mtu mtu-value command in the PW template view.
One of the following MTUs with priorities in descending order is selected:
  1. Mtu parameter specified in the mpls l2vc command or mpls switch-l2vc command
  2. MTU configured in PW template
  3. Interface MTU of the AC interface
  4. Default MTU value (1500 bytes)
Kompella VLL Configure the mtu mtu-value command in MPLS-L2VPN instance view. One of the following MTUs with priorities in descending order is selected:
  1. MTU configured in MPLS-L2VPN instance view
  2. Default MTU value (1500 bytes)
VPLS Configure the mtu mtu-valuecommand in VSI view. One of the following MTUs with priorities in descending order is selected:
  1. MTU configured in VSI instance view
  2. Default MTU value (1500 bytes)

By default, Huawei routers implement MTU negotiation for VCs or PWs. Two nodes must use the same MTU to ensure that a VC or PW is established successfully. L2VPN MTUs are only used to establish VCs and PWs and do not affect packet forwarding.

To communicate with non-Huawei devices that do not verify L2VPN MTU consistency, L2VPN MTU consistency verification can be disabled on NE20E. This allows NE20E to establish VCs and PWs with the non-Huawei devices.

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Updated: 2019-01-02

Document ID: EDOC1100055376

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