Planet XGS3-24042 User Manual download pdf (Page 676)

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101

81-30

Figure 81-3 Forwarding VPN Packets

1. Site1 sends an IP packet with a destination address of 1.1.1.2, which is sent by CE1 to

PE1.

2. PE1 looks up VPN-instance entries according to the interface receiving the packet and the

destination address, then forwards the packet after adding two layers of label (inner and

outer) to it, if there is a match.

3. The MPLS network will send the packet to PE2 according to the outer layer label (removed

when the packet reaching the last-hop of PE2, leaving only the inner layer) of it.

4. PE1 looks up VPN-instance entries according to the inner layer of label and the destination

address, then forwards the packet to CE2 after determining its egress interface.

5. CE2 forwards the packet to its destination according to the regular IP forwarding process.

81.1.4 BGP/MPLS VPN Networking Resolution

In BGP/MPLS VPN networks, the advertisement and receipt of VPN routes between different sites are

controlled by VPN Target Attribute. The configurations of VPN Export Target and Import Target are

independent, both allowing multiple values, and hence can realize flexible VPN access control and various

VPN networking resolutions.

Basic VPN

In the most basic instance, all users of a VPN form a closed user group, allowing the forwarding of traffic

between them. But no user within the VPN can communicate with outside users.

In such networking, each VPN will obtain an exclusive VPN Target as its Export Target and Import Target,

which should not be used by other VPN.

1.1.1.1/24

1.1.1.2/24

PE2

site1

CE1

PE1

CE2

1.1.1.2

Layer2

Layer1

1.1.1.2

Layer2

1.1.1.2

site2

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