3Com S7902E, Configuration Manual

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1-24
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If the addresses of the tunnel interfaces at the two ends of a tunnel are not in the same network
segment, a forwarding route through the tunnel to the peer must be configured so that the
encapsulated packet can be forwarded normally. You need to configure a static or dynamic route at
both ends of the tunnel. For the detailed configuration, refer to Static Routing Configuration or other
routing protocol configuration in the IP Routing Volume .
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The IPv4 address and the destination address of a tunnel interface cannot be in the same network
segment.
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The destination address of a route with a tunnel interface as the egress interface and the
destination address of the tunnel interface must not be in the same network segment.
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Two or more tunnel interfaces using the same encapsulation protocol must have different source
and destination addresses.
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If you specify a source interface instead of a source address for the tunnel, the source address of
the tunnel is the primary IP address of the source interface.
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When you configure dynamic routing at each tunnel end, you need to enable the dynamic routing
protocol on the tunnel interface. For related configurations, refer to related contents in the IP
Routing Volume .
Configuration Example
Network requirements
The two subnets Group 1 and Group 2 running IPv4 are interconnected via an IPv4 over IPv4 tunnel
between Switch A and Switch B.
Figure 1-11 Network diagram for an IPv4 over IPv4 tunnel
Vlan-int101
2.1.1.1/24
Vlan-int100
10.1.3.1/24
Vlan-int100
10.1.1.1/24
Switch A
IPv4 netwok
IPv4
Group 1
Tunnel1
10.1.2.1/24
Vlan-int101
3.1.1.1/24
Tunnel2
10.1.2.2/24
IPv4
Group 2
Switch B
Configuration procedure
Make sure that Switch A and Switch B have the corresponding VLAN interfaces created and are
reachable to each other.
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Configuration on Switch A