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Configuration Guide - MPLS

S7700 and S9700 V200R011C10

This document describes MPLS configurations supported by the switch, including the principle and configuration procedures of static LSPs, MPLS LDP, MPLS TE, MPLS QoS, MPLS OAM, Seamless MPLS, and MPLS common features, and provides configuration examples.
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Licensing Requirements and Limitations for MPLS TE

Licensing Requirements and Limitations for MPLS TE

Involved Network Elements

Other network elements are not required.

License Requirements

You can use the MPLS TE feature only after the MPLS function is enabled. The MPLS function is controlled by a license. By default, MPLS is disabled on a new device. To use the MPLS function, apply for and purchase the license from the equipment supplier.

For details about how to apply for a license, see S Series Switch License Use Guide.

Version Requirements

Table 5-25  Products and versions supporting MPLS TE

Product

Product Model

Software Version

S7700

S7703, S7706, S7712

V100R003C01, V100R006C00, V200R001(C00&C01), V200R002C00, V200R003C00, V200R005C00, V200R006C00, V200R007C00, V200R008C00, V200R009C00, V200R010C00, V200R011C10

S9700

S9703, S9706, S9712

V200R001(C00&C01), V200R002C00, V200R003C00, V200R005C00, V200R006C00, V200R007(C00&C10), V200R008C00, V200R009C00, V200R010C00, V200R011C10

NOTE:
To know details about software mappings, see Hardware Query Tool.

Feature Limitations

When configuring MPLS TE on the switch, pay attention to the following points:
  • The SA series cards do not support MPLS TE.

  • In V200R006 and earlier versions, the X1E series cards do not support MPLS TE. In V200R007 and later versions, the X1E series cards support MPLS TE.

  • The XGE interface connected to ACU2, ET1D2IPS0S00, ET1D2FW00S00, ET1D2FW00S01, or ET1D2FW00S02 card does not support MPLS TE.

  • In V200R003 and earlier versions, only VLANIF interfaces support MPLS TE. In V200R005 and later versions, both VLANIF interfaces and Layer 3 Ethernet interfaces support MPLS TE.

When configuring TE FRR on the switch, pay attention to the following points:
  • Dynamic TE tunnels using bandwidth reserved in Shared Explicit (SE) style support TE FRR, but static TE tunnels do not.

  • For E series, B series, SC series, and F series cards, if TE FRR is enabled in a scenario where MPLS TE tunnels transmit VPN services, you must configure PHP when the MP node is the egress node of the primary CR-LSP.

  • When TE FRR and card removal protection are used on the PLR, ensure that the bypass CR-LSPs' tunnel interfaces and the bypass CR-LSP's outbound interface are configured on an LPU different from the LPU to be removed. Configuring the bypass TE tunnel interface on an MPU of the PLR is recommended.
    NOTE:
    After an interface connected to an LSR or a CR-LSP is deleted or its card is removed, the interface enters the stale state. If the number of stale interfaces on a node reaches the maximum number, the node does not implement FRR for the primary tunnel if the LPU where the physical outbound interface of the primary CR-LSP resides is removed or faulty.
  • On the device, TE FRR can be performed during the RSVP GR process. This protects traffic on the primary tunnel and speeds up troubleshooting in the situation where a traffic switchover or a reboot is triggered after a fault occurs on a PLR, the PLR's upstream node, an MP, or the MP's downstream node, while the outbound interface of a primary tunnel on the PLR fails. During the RSVP GR process, FRR switching is triggered if the outbound interface of a primary tunnel on the PLR goes Down.

When configuring tunnel protection groups on the switch, pay attention to the following points:
  • A tunnel protection group works in either 1:1 or N:1 mode. The 1:1 mode enables a protection tunnel to protect only one working tunnel. The N:1 mode enables a protection tunnel to protect multiple working tunnels. In a tunnel protection group, a maximum of 16 primary tunnels can be protected.
  • Tunnel-specific attributes in a tunnel protection group are independent from each other. For example, a protection tunnel with the bandwidth 50 Mbit/s can protect a working tunnel with the bandwidth 100 Mbit/s.
  • Besides configuring a tunnel protection group to protect the working tunnel, you can configure TE FRR on the working tunnel in the protection group for dual protection to the working tunnel.
    NOTE:

    A tunnel protection group and TE FRR cannot be configured simultaneously on the ingress node of a primary tunnel.

  • A protection tunnel cannot be protected by other tunnels or be enabled with TE FRR.
When configuring BFD for MPLS TE on the switch, pay attention to the following points:
  • BFD can detect faults in static and dynamic CR-LSPs.
  • BFD for LSP can function properly even if the forward and backward forwarding modes are different. (For example, the forward path is an LSP and the backward path is an IP link.) The forward path and the backward path must be established over the same link; otherwise, if a fault occurs, BFD cannot identify the faulty path. Before deploying BFD, ensure that the forward and backward paths are over the same link so that BFD can correctly identify the faulty path.

  • For the same CR-LSP, MPLS OAM and BFD cannot be configured simultaneously.

  • For the same TE tunnel, MPLS OAM and BFD cannot be configured simultaneously.

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Updated: 2019-10-18

Document ID: EDOC1000178315

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