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interface or specify the IPv4 address of the peer tunnel interface as the next hop. Alternatively, you
can enable a dynamic routing protocol on both tunnel interfaces to achieve the same purpose. For
the detailed configuration, see Layer 3—IP Routing Configuration Guide.
• The destination address of the route passing the tunnel interface must not be on the same subnet as
the destination address configured on the tunnel interface.
To configure an IPv4 over IPv4 tunnel:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter IPv4 over IPv4 tunnel
interface view.
interface tunnel number [ mode
ipv4-ipv4 ]
N/A
3. Configure an IPv4 address for
the tunnel interface.
ip address ip-address { mask |
mask-length } [ sub ]
By default, no IPv4 address is
configured for the tunnel interface.
4. Configure a source address or
source interface for the tunnel
interface.
source { ip-address |
interface-type interface-number }
By default, no source address or
source interface is configured for
the tunnel interface.
The specified source address or the
IPv6 address of the specified source
interface is used as the source IP
address of tunneled packets.
5. Configure a destination
address for the tunnel
interface.
destination ip-address
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.
6. (Optional.) Set the DF bit for
tunneled packets.
tunnel dfbit enable
The DF bit is not set for tunneled
packets by default.
Configuration example
Network requirements
As shown in Figure 90, the two subnets group 1 and group 2 use private IPv4 addresses. Configure an
IPv4 over IPv4 tunnel between Switch A and Switch B so the two subnets can reach each other.
Figure 90 Network diagram
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