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Configuring a GRE/IPv6 tunnel
The following matrix shows the feature and hardware compatibility:
Hardware GRE/IPv6 tunnel compatibility
MSR954(JH296A/JH297A/JH298A/JH299A/JH373A) No
MSR958(JH300A/JH301A) No
MSR1002-4/1003-8S Yes
MSR2003 Yes
MSR2004-24/2004-48 Yes
MSR3012/3024/3044/3064 Yes
MSR4060/4080 Yes
Perform this task to configure a GRE tunnel on an IPv6 network.
Configuration guidelines
Follow these guidelines when you configure a GRE/IPv6 tunnel:
• You must configure the tunnel source address and destination address at both ends of a tunnel.
The tunnel source or destination address at one end must be the tunnel destination or source
address at the other end.
• As a best practice, do not configure the same tunnel source and destination addresses for local
tunnel interfaces that use the same tunnel mode.
• You can enable or disable GRE checksum at each end of a tunnel. If GRE checksum is enabled
at a tunnel end, the tunnel end sends packets carrying the checksum to the peer end. A tunnel
end checks the GRE checksum of a received packet if the packet carries a GRE checksum,
whether or not the tunnel end is enabled with GRE checksum.
• To ensure correct packet forwarding, identify whether the destination network of packets and
the IP address of the local tunnel interface are on the same subnet. If they are not, configure a
route reaching the destination network through the tunnel interface. You can configure the route
by using the following methods:
{ Configure a static route, using the local tunnel interface as the outgoing interface of the
route.
{ Enable a dynamic routing protocol on both the tunnel interface and the interface connecting
the private network. This allows the dynamic routing protocol to establish a routing entry
with the tunnel interface as the outgoing interface.
• The IP address of the tunnel interface and the tunnel destination address configured on the
tunnel interface must be in different subnets.
For information about tunnel interfaces, the interface tunnel, source, destination, and tunnel
discard ipv4-compatible-packet commands, and additional configuration commands on a tunnel
interface, see "Configuring tunneling."
Configuration procedure
To configure a GRE/IPv6 tunnel:
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