Configuration Example - HPE FlexNetwork 10500 Series Configuration Manual

•
The IPv4 address of the local tunnel interface cannot be on the same subnet as the destination
address configured on the tunnel interface.
•
To ensure correct packet forwarding, identify whether the destination IPv4 network and the IPv4
address of the local tunnel interface are on the same subnet. If they are not, configure a route
reaching the destination IPv4 network through the tunnel interface. You can configure the route
by using one of the following methods:
Configure a static route, and specify the local tunnel interface as the egress interface or

specify the IPv4 address of the peer tunnel interface as the next hop.
Enable a dynamic routing protocol on both tunnel interfaces to achieve the same purpose.

For more information about route configuration, see Layer 3—IP Routing Configuration Guide.
•
The destination address of the route passing the tunnel interface cannot be on the same subnet
as the destination address configured on the tunnel interface.
To configure an IPv4 over IPv4 tunnel:
Step
1. Enter system view.
2. Enter IPv4 over IPv4 tunnel
interface view.
3. Configure an IPv4 address
for the tunnel interface.
4. Configure a source address
or source interface for the
tunnel interface.
5. Configure a destination
address for the tunnel
interface.
6. (Optional.) Set the DF bit for
tunneled packets.

Configuration example

Network requirements
As shown in
Configure an IPv4 over IPv4 tunnel between Switch A and Switch B to make the two subnets
reachable to each other.
Figure 95, the two subnets IPv4 group 1 and IPv4 group 2 use private IPv4 addresses.
Command
system-view
interface tunnel number [ mode
ipv4-ipv4 ]
ip address ip-address { mask |
mask-length } [ sub ]
source { ipv4-address |
interface-type interface-number }
destination ipv4-address
tunnel dfbit enable
256
Remarks
N/A
N/A
By default, no IPv4 address is
configured for the tunnel interface.
By default, no source address or
source interface is configured for
the tunnel interface.
If you specify a source address, it
is used as the source IP address
of tunneled packets.
If you specify a source interface,
the primary IP address of this
interface is used as the source IP
address of tunneled packets.
By default, no destination address
is configured for the tunnel
interface.
The tunnel destination address
must be the IP address of the
receiving interface on the tunnel
peer. It is used as the destination
IP address of tunneled packets.
By default, the DF bit is not set for
tunneled packets.