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NE20E-S V800R010C10SPC500 Feature Description - MPLS 01

This is NE20E-S V800R010C10SPC500 Feature Description - MPLS
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Traffic Forwarding Component

Traffic Forwarding Component

The traffic forwarding component imports traffic to a tunnel and forwards traffic over the tunnel. Although the information advertisement, path selection, and path establishment components are used to establish a CR-LSP in an MPLS TE tunnel, a CR-LSP (unlike an LDP LSP) cannot automatically import traffic. The traffic forwarding component must be used to import traffic to the CR-LSP before it forwards traffic based on labels.

Static Route

Static route is the simplest method for directing traffic to a CR-LSP in an MPLS TE tunnel. A TE static route works in the same way as a common static route and has a TE tunnel interface as an outbound interface.

Auto Route

An Interior Gateway Protocol (IGP) uses an auto route related to a CR-LSP in a TE tunnel that functions as a logical link to calculate a path. The tunnel interface is used as an outbound interface in the auto route. The TE tunnel is considered a P2P link with a specified metric value. The following auto routes are supported:

  • IGP shortcut: A route related to a CR-LSP is not advertised to neighbor nodes, preventing other nodes from using the CR-LSP.

  • Forwarding adjacency: A route related to a CR-LSP is advertised to neighbor nodes, allowing these nodes to use the CR-LSP.

    Forwarding adjacency allows tunnel information to be advertised based on IGP neighbor relationships.

    If the forwarding adjacency is used, nodes on both ends of a CR-LSP must be in the same area.

The following example demonstrates the IGP shortcut and forwarding adjacency.

Figure 4-11 Schematic diagram for IGP shortcut and forwarding adjacency
A CR-LSP over the path LSRG → LSRF → LSRB is established on the network shown in Figure 4-11, and the TE metric values are specified. Either of the following configurations can be used:
  • The auto route is not used. LSRE uses LSRD as the next hop in a route to LSRA and a route to LSRB; LSRG uses LSRF as the next hop in a route to LSRA and a route to LSRB.
  • The auto route is used. Either IGP shortcut or forwarding adjacency can be configured:
    • The IGP shortcut is used to advertise the route of Tunnel 1. LSRE uses LSRD as the next hop in the route to LSRA and the route to LSRB; LSRG uses Tunnel 1 as the next hop in the route to LSRA and the route to LSRB. LSRG, unlike LSRE, uses Tunnel 1 in IGP path calculation.

    • The forwarding adjacency is used to advertise the route of Tunnel 1. LSRE uses LSRG as the next hop in the route to LSRA and the route to LSRB; LSRG uses Tunnel 1 as the next hop in the route to LSRA and the route to LSRB. Both LSRE and LSRG use Tunnel 1 in IGP path calculation.

Policy-based Routing

The policy-based routing (PBR) allows the system to select routes based on user-defined policies, improving security and load balancing traffic. If PBR is enabled on an MPLS network, IP packets are forwarded over specific CR-LSPs based on PBR rules.

MPLS TE PBR, the same as IP unicast PBR, is implemented based on a set of matching rules and behaviors. The rules and behaviors are defined using an apply clause, in which the outbound interface is a specific tunnel interface. If packets do not match PBR rules, they are properly forwarded using IP; if they match PBR rules, they are forwarded over specific CR-LSPs.

Tunnel Policy

Tunnel policies applied to virtual private networks (VPNs) guide VPN traffic to tunnels in either of the following modes:
  • Select-seq mode: The system selects tunnels for VPN traffic in the specified tunnel selection sequence.
  • Tunnel binding mode: A CR-LSP is bound to a destination address in a tunnel policy. This policy applies only to CR-LSPs.
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Updated: 2019-01-03

Document ID: EDOC1100055123

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