H3C Technologies H3C S10500 Series Switches - Manual (Page 197)

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Configuration guidelines
• Deleting a tunnel interface also removes the functions configured on this tunnel interface.
• The source address and destination address of a tunnel uniquely identify a path. They must be
configured at both ends of the tunnel and the source address at one end must be the destination
address at the other end and vice versa.
• Tunnel interfaces using the same encapsulation protocol must have different source addresses and
destination addresses.
• If you configure a source interface for a tunnel interface, the tunnel interface takes the primary IP
address of the source interface as its source address.
• When configuring a route through the tunnel, you are not allowed to set up a static route whose
destination address is in the subnet of the tunnel interface. Instead, you can do one of the following:
{
Configure a static route, using the address of the network segment the original packet is
destined for as its destination address and the address of the peer tunnel interface as its next
hop.
{
Enable a dynamic routing protocol on both the tunnel interface and the router interface
connecting the private network, so that the dynamic routing protocol can establish a routing
entry that allows the tunnel to forward packets through the tunnel.
Configuration procedure
Follow these steps to configure a GRE over IPv6 tunnel:
To do… Use the command… Remarks
Enter system view system-view —
Enable the IPv6 packet forwarding
function
ipv6
Required
Disabled by default
Create a tunnel interface and enter
tunnel interface view
interface tunnel interface-number
Required
By default, there is no tunnel
interface on a device.
Configure an IPv4 address for the
tunnel interface ip address ip-address { mask |
mask-length }
Required
By default, no IPv4 address is
configured for a tunnel interface.
Set the tunnel mode to GRE over
IPv6
tunnel-protocol gre ipv6
Required
By default, the tunnel is a GRE over
IPv4 tunnel.
You must configure the same tunnel
mode on both ends of a tunnel.
Otherwise, packet delivery will
fail.
Configure the source address or
interface for the tunnel interface
source { ipv6-address |
interface-type interface-number }
Required
By default, no source address or
interface is configured for a tunnel
interface.