3Com Switch 8800 Advanced Software V5 Configuration Guide

Configuring Automatic IPv4-Compatible IPv6 Tunnel 385
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For the configuration of the tunnel interface MTU, refer to the ipv6 mtu
command in the Switch 8800 Command Reference Guide.
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CAUTION:
■ For automatic IPv4-compatible IPv6 tunnels, 6to4 tunnels, or ISATAP tunnels,
their tunnel interfaces must have different source addresses.
■ No destination address needs to be configured for an automatic
IPv4-compatible IPv6 tunnel.
■ 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 detailed configuration, refer to
“IP
Routing and Routing Table” on page 187.
■ Automatic IPv4-compatible IPv6 tunnels support only BGP4+.
■ 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.
Configuration Example Network requirements
Between Switch A and Switch B is an IPv4 network. It is required that an IPv6
connection be established through an automatic IPv4-compatible IPv6 tunnel
between the two dual-stack switches.
Configure an automatic IPv4-compatible
IPv6 tunnel
tunnel-protocol
ipv6-ipv4 auto-tunnel
Required
By default, the tunnel is
a GRE tunnel. The same
tunnel type should be
configured at both ends
of the tunnel. Otherwise,
packet delivery will fail.
Configure a source address for the
tunnel
source { ip-address |
ipv6-address |
interface-type
interface-number }
Required
By default, no source
address or interface is
configured for the
tunnel.
Configure a link aggregation group ID
to be referenced by the tunnel interface
aggregation-group
aggregation-group-id
Required
Enable the expedite termination
function
expediting enable Optional
By default, the expedite
termination function is
disabled.
Configure an address and mask for the
expedite termination subnet
expediting subnet
ip-address mask
Optional
By default, no expedite
termination subnet is
configured for a tunnel.
Configure a tunnel interface MTU mtu mtu-size Optional
To do... Use the command... Remarks