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Feature Description - VPN 01

NE05E and NE08E V300R003C10SPC500

This is NE05E and NE08E V300R003C10SPC500 Feature Description - VPN
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VPWS Basic Functions

VPWS Basic Functions

Basic VPWS Architecture

As shown in Figure 6-1, the VPWS architecture consists of ACs, PWs, and tunnels.

Figure 6-1 Basic VPWS architecture

Functional Modules

VPWS has the following functional modules:

  • AC: An independent physical or virtual circuit connecting a CE and a PE. An AC interface can be a physical interface or a virtual interface. The AC attributes include the encapsulation type, maximum transmission unit (MTU), and interface parameters of the specified link type.

  • PW: A virtual link or path between two nodes on a network. In this document, it is a virtual connection between two PEs.

  • Tunnel: A virtual link used to transparently transmit service data.

  • PW signaling: A type of signaling for PW negotiation.

Figure 6-1 uses the flow direction of VPN1 packets from CE1 to CE3 as an example to show data transmission.

  • CE1 sends user packets to PE1 over an AC.

  • Upon receipt, PE1 selects a PW to forward the packets.

  • PE1 generates double MPLS labels (one private network label and one public network label) according to the PW forwarding entry. The private network label identifies a PW, and the public network label identifies a public network tunnel.

  • After user packets travel along the public network tunnel to PE2, PE2 removes the private network label. The public network label is removed by means of penultimate hop popping (PHP) on the P.

  • PE2 selects an AC and forwards these packets to CE3.

Figure 6-2 shows label changes in packet forwarding over a VPWS network.

Figure 6-2 VPWS label processing

In Figure 6-2:

  • L2PDU: Layer 2 protocol data unit, a type of link-layer packet.

  • T: a tunnel label.

  • V: a VC label.

  • T': a substitute tunnel label during packet forwarding.

Updated: 2019-01-14

Document ID: EDOC1100058940

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