3Com Switch 8800 Advanced Software V5 Configuration Guide

Configuring ISATAP Tunnel 393
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CAUTION:
■ For automatic IPv4-compatible IPv6 tunnels, 6to4 tunnels, or ISATAP tunnels,
their tunnel interfaces must have different source addresses.
■ If the tunnel interface addresses at the two ends of a tunnel are not in the
same network segment, a forwarding route through the tunnel to the peer
must be configured so that the encapsulated packet can be forwarded. You
can configure static or dynamic routes. A forwarding route needs to be
configured at both ends of the tunnel. For the detailed configuration, refer to
“IP Routing and Routing Table” on page 187.
■ When you configure a static route, you need to configure a route to the
destination address (the destination IP address of the packet, instead of the
IPv4 address of the tunnel destination) and set the next-hop to the tunnel
interface number or network address at the local end of the tunnel. A static
route must be configured at both ends of the tunnel.
■ Protocol packets can be processed properly only after expedite termination is
enabled on the tunnel interface.
Configuration Example Network requirements
The destination address of a tunnel is an ISATAP address. It is required that IPv6
hosts in the IPv4 network can access the IPv6 network via an ISATAP tunnel.
Network diagram
Figure 119 Network diagram for an ISATAP tunnel
Configuration procedure
The following example shows how to configure an ISATAP tunnel between the
switch and the ISATAP host, which allows a separate ISATAP host to access the
IPv6 network.
1 Configure the switch
# Enable the IPv6 forwarding function.
<Switch> system-view
[Switch] ipv6
# Configure addresses for interfaces.
[Switch] vlan 100
[Switch-vlan100] port GigabitEthernet 1/1/1
[Switch-vlan100] quit
[Switch] interface vlan-interface 100
[Switch-Vlan-interface100] ipv6 address 3001::1/64
[Switch-Vlan-interface100] quit
[Switch] vlan 101
IPv6 network
Vlan-int101
2.1.1 .1/8
Vlan-int100
3001::1/64
ISATAP switch
IPv6 host
ISATAP host
IPv4 address :
2.1.1.2/32
IPv6 address :
FE80:5EFE:0201 :0102
2001:5EFE0201 :0102
IPv6 address:
3001::2/64
IPv4 network