3Com Switch 8800 Advanced Software V5 Configuration Guide

Configuring a GRE over IPv4 Tunnel 409
Note that:
Configure an IPv4 address for
the tunnel interface
ip address ip-address { mask
| mask-length }
Any of the three must be
selected.
By default, no IPv4 address is
configured on a tunnel
interface.
Whether to configure an IPv4
or IPv6 address on a tunnel
interface depends on the
actual needs.
By default, no IPv6 global
unique address or site-local
address is configured on a
tunnel interface.
Configur
e an IPv6
address
for the
tunnel
interface
Configure an IPv6
global unique
address or a
site-local address
ipv6 address { ipv6-address
prefix-length |
ipv6-address/prefix-length }
ipv6 address
ipv6-address/prefix-length
eui-64
Configure an IPv6
link-local address
ipv6 address auto link-local Optional
By default, when an interface
is configured with an IPv6
global unique address or a
site-local address, a link-local
address is created
automatically.
ipv6 address ipv6-address
link-local
Set the tunnel mode to GRE
over IPv4
tunnel-protocol gre Optional
GRE over IPv4 by default
Note that both ends of a
tunnel must be configured
with the same tunnel mode.
Otherwise, packet delivery
will fail.
Configure the source address
for the tunnel interface
source { ip-address |
interface-type
interface-number }
Required
By default, no source address
is configured for a tunnel
interface.
Configure the destination
address for the tunnel
interface
destination ip-address Required
By default, no destination
address is configured for a
tunnel interface.
Specify the service loop group
for the tunnel interface to
reference
aggregation-group
aggregation-group-ID
Required
Configure a route through the
tunnel
Refer to “IP Routing
Overview” on page 187.
Optional
Each end of the tunnel must
have a route (static or
dynamic) through the tunnel
to the other end.
Enable the expedite
termination function for a
tunnel interface
expediting enable Optional
Disabled by default
Moreover, this function has
no effect on GRE IPv4 over
IPv4 tunnels
Set the MTU value for the
tunnel interface
mtu mtu-size Optional
To do... Use the command... Remarks