Setting Encapsulation Mode; Specifying Tunnel Source - 3Com 3C13636 Configuration Manual

3Com Router 3000 Ethernet Family
Configuration Guide
card, which can take on the value of 0 or 1; port represents the number of the specified
interface, ranging from 0 to 1023, but the actual number of created tunnels depends on
the total number of interfaces and available memory.
On creating Tunnel interface, it is recommended that the parameter slot should keep in
line with the slot of source end interface configured by the source command. In other
words, slot number specified by slot is the same as that of the actual physical interface
forwarding GRE packets, thus improving the forwarding efficiency.

3.2.2 Setting Encapsulation Mode

Encapsulation protocol and delivery protocol are to be configured on tunnel interface.
You may choose not to configure them on both ends of the tunnel, but if you do
configure them, make sure to use the same encapsulation mode on both ends (by far,
only GRE is available).
Perform the following configuration in tunnel interface view.
Table 3-2 Set encapsulation mode
Set encapsulation mode on the tunnel interface.
Delete the encapsulation mode on the tunnel
interface.
By default, encapsulation protocol is GRE, and delivery protocol is IP.

3.2.3 Specifying Tunnel Source

After the creation of a tunnel interface, the source address of the tunnel, that is, the
actual physical interface address where GRE packets are forwarded also needs to be
specified. A tunnel is uniquely identified by one source address and one destination
address. These configurations are required on both ends of the tunnel, with the source
address at one end being the destination address at the other end and vice versa.
Perform the following configuration in tunnel interface view.
Table 3-3 Specify source address or source interface of the tunnel
Specify
interface of the tunnel.
Delete the source address or source
interface of the tunnel.
Operation
Operation
source address or
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Chapter 3 Configuration of GRE
tunnel-protocol gre
undo tunnel-protocol
source source {
interface-num }
undo source
3-5
Command
Command
ip-addr | interface-type