6Pe; 6Vpe; Figure 3-6 Working Principle Of Isatap Tunnel - Zte ZXR10 ZSR V2 Series Product Description

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De-encapsulation principles: the de-encapsulation process of ISATAP tunnel is
exactly the same with that of 6in4. The basic principle works as follows: when IPv4
data packets are received, and the protocol number in IPv4 header is 41, invoke
each protocol number processing function registered to IPv4, and enter 6in4
de-encapsulation. Check the matched tunnel item based on the source address and
destination address of the packet. Peel off the IPv4 header encapsulated by the
tunnel if it is found. The left IPv6 packets are delivered to processing of IPv6 packet
receiving procedure.

Figure 3-6 Working principle of ISATAP tunnel

3.9.5

6PE

6PE implements IPv6/IPv4 dual-stack functions.It exchange labeled IPv6 routes over
MP-BGP sessions running over IPv4.6PE forward IPv6 data over the IPv4-signaled LSP,
outer labels for forwarding packets, inner label for identifying IPv6 packets.
3.9.6

6VPE

6VPE (IPv6 VPN Provider Edge) is a technology that provides IPv6 user network with
BGP MPLS VPN service. The technical principle of 6VPE originates from BGP MPLS
VPN in IPv4. It's especially an expansion of IPv4 BGP MPLS VPN.6VPE doesn't restrict
the IP protocol version that the backbone network adopts. In this way IPv6 VPN traffic
can be transmitted by IPv6 tunnel or IPv4 tunnel.
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