3Com Switch 8800 Advanced Software V5 Configuration Guide

396 CHAPTER 33: TUNNELING CONFIGURATION
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CAUTION:
■ If the tunnel interface addresses 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. You
can configure static or dynamic routes. A forwarding route needs to be
configured at both ends of the tunnel. For the detailed configuration, refer to
“IP Routing and Routing Table” on page 187.
■ Two or more tunnel interfaces using the same encapsulation protocol must
have different source and destination addresses.
■ If the tunnel interface is the source interface, the tunnel source address is the
primary IP address of the source interface.
■ IPv4 over IPv4 tunnels do not support expedite termination.
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.
Configure an IPv4 address for
the tunnel interface
ip address ip-address { mask |
mask-length } [ sub ]
Required
By default, no IPv4 address is
configured for the tunnel
interface.
Set the tunnel to an IPv4 over
IPv4 tunnel
tunnel-protocol ipv4-ipv4 Optional
By default, the tunnel is a GRE
tunnel. The same tunnel type
should be configured at both
ends of the tunnel. Otherwise,
packet delivery will fail.
Configure a source address or
source interface for the tunnel
source { ip-address |
ipv6-address | interface-type
interface-number }
Required
By default, no source address
or interface is configured for
the tunnel.
Configure a destination
address for the tunnel
destination ip-address Required
By default, no destination
address is configured for the
tunnel.
Configure a link aggregation
group ID to be referenced by
the tunnel interface
aggregation-group
aggregation-group-id
Required
Configure the tunnel interface
MTU
mtu mtu-size Optional
To do... Use the command... Remarks