Technical data

154 FastIron Ethernet Switch Administration Guide
53-1002637-02
IPv6 over IPv4 tunnels
5
Configuring a static route in a non-default VRF or User VRF
To configure a static IPv6 route for a destination network with the prefix 2001:DB8::0/32, a
next-hop gateway with the global address 2001:DB8:0:ee44::1, in the non-default VRF named
“blue”, enter the following at the general configuration prompt.
Brocade(config)# ipv6 route vrf blue 2001:DB8::0/32 2001:DB8:0:ee44::1
Syntax: [no] ipv6 route vrf vrf-name dest-ipv6-prefix/prefix-length next-hop-ipv6-address
The dest-ip-addr is the route’s destination. The dest-mask is the network mask for the route’s
destination IPv6 address.
The vrf-name is the name of the VRF that contains the next-hop router (gateway) for the route.
The next-hop-ip-addr is the IPv6 address of the next-hop router (gateway) for the route.
NOTE
The vrf needs to be a valid VRF to be used in this command.
IPv6 over IPv4 tunnels
NOTE
This feature is supported only with the IPv6 Layer 3 license on FSX devices and the full Layer 3 image
on other devices.
To enable communication between isolated IPv6 domains using the IPv4 infrastructure, you can
manually configure IPv6 over IPv4 tunnels that provide static point-point connectivity.
As shown in Figure 1, these tunnels encapsulate an IPv6 packet within an IPv4 packet.
FIGURE 1 IPv6 over an IPv4 tunnel
In general, a manually configured tunnel establishes a permanent link between switches in IPv6
domains. A manually configured tunnel has explicitly configured IPv4 addresses for the tunnel
source and destination.
This tunneling mechanism requires that the Layer 3 switch at each end of the tunnel run both IPv4
and IPv6 protocol stacks. The Layer 3 switches running both protocol stacks, or dual-stack routers,
can interoperate directly with both IPv4 and IPv6 end systems and routers. Refer to “Configuring
IPv4 and IPv6 protocol stacks” section in the FastIron Ethernet Switch Administration Guide.
IPv4 Header IPv6 Header IPv6 Data
IPv6 Header IPv6 Data
IPv6 Header IPv6 Data
Dual-Stack L3 Switch
IPv6 Traffic Over IPv4 Tunnel
IPv6
Network
IPv6
Network
IPv4
Network
Dual-Stack L3 Switch
IPv6 Host
IPv6 Host