Huawei S9300 Configuration Manual page 196

S9300&S9300E Terabit Routing Switch
Configuration Guide - IP Service
A manual tunnel is equivalent to a permanent link between two IPv6 networks over an IPv4
backbone network. It is the fixed channel for regular and secure communication between the
two border devices.
The manual tunnel can be used between isolated IPv6 networks. It can also be used between a
border device and a host. In this case, the host and the device on both ends of the tunnel must
support the IPv4 and the IPv6 protocol stacks.
IPv6 GRE Tunnel
An IPv6 GRE tunnel is set up by configuring the border devices of two tunnel ends. The source
IPv4 address and destination IPv4 address of such a tunnel must be configured statically.
A manual tunnel is equivalent to a permanent link between two IPv6 networks over an IPv4
backbone network. It is the fixed channel for regular and secure communication between the
two border devices.
The manual tunnel can be used between isolated IPv6 networks. It can also be used between a
border device and a host. In this case, the host and the device on both ends of the tunnel must
support the IPv4 and the IPv6 protocol stacks.
6to4 Tunnel
A 6to4 tunnel is a mechanism that connects several isolated IPv6 domains to each other over an
IPv4 network. The 6to4 tunnel can be configured on the border device between the isolated IPv6
network and the IPv4 network. The border device on both the ends of the 6to4 tunnel must
support the IPv4 and the IPv6 dual protocol stacks at the same time.
The key difference between the 6to4 tunnel and the manual tunnel is that the former can be a
point-to-multipoint connection, and the latter is only a point-to-point connection. Hence, the
devices of the 6to4 tunnel are not configured in pairs.
The 6to4 tunnel can automatically find another end of the tunnel, like the automatic tunnel. You
need not specify the IPv4-compatible IPv6 address for it.
The 6to4 tunnel uses a kind of special IPv6 address, namely the 6to4 address with the following
format:
2002:IPv4 address: subnet ID:interface ID
The prefix of the 6to4 address is 2002:IPv4 address with the length of 48 bits. Of these, the IPv4
address is a globally unique one requested for an isolated IPv6 domain. This IPv4 address must
be configured on the IPv6/IPv4 border device's physical interface that is connected with the IPv4
network. The length of the subnet ID is 16 bits, and that of the interface ID is 64 bits. Both the
subnet ID and the interface ID are allocated in the isolated IPv6 domains.
As shown in
network are allocated with 6to4 addresses. The IPv4 address contained in the 6to4 address of
the host or device in Site1 is the IPv4 address of the interface through which Switch A accesses
the IPv4 network. Similarly, the IPv4 address contained in the 6to4 address of the host or device
in Site2 is the IPv4 address of the interface through which Switch B accesses the IPv4 network.
Switch A and Switch B are both 6to4 devices.
Issue 01 (2012-03-15)
Figure 11-3, Site1 and Site2 are 6to4 networks, and hosts and devices in the 6to4
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11 IPv6 over IPv4 Tunnel Configuration
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