162 BigIron RX Series Configuration Guide53-1001810-01Configuring IP parameters7Tunnel mode gre ipTunnel loopback is 1/3No port nameMTU 1476 BytesSyntax: show interface tunnel The parameter indicates the tunnel interface number for which you want to displayinformation.IPv6 over IPv4 tunnels in hardwareTo enable communication between the isolated IPv6 domains using the IPv4 infrastructure, youcan configure IPv6 over IPv4 tunnels.Brocade supports the following IPv6 over IPv4 tunneling in hardware mechanisms:• Manually configured tunnelsIn general, a manually configured tunnel establishes a permanent link between routers in IPv6domains. A manually configured tunnel has explicitly configured IPv4 addresses for the tunnelsource and destination.This tunneling mechanism requires that the router at each end of the tunnel run both IPv4 and IPv6protocol stacks. The routers running both protocol stacks, or dual-stack routers, can interoperatedirectly with both IPv4 and IPv6 end systems and routers.Configuring a manual IPv6 tunnelYou can use a manually configured tunnel to connect two isolated IPv6 domains. You should deploythis point-to-point tunnel mechanism if you need a permanent and stable connection.Configuration notes• The tunnel mode should be ipv6ip indicating that this is ipv6 manual tunnel• Both source and destination addresses needs to be configured on the tunnel.• On the remote side we need to have exactly opposite source or destination pair.• The tunnel destination should be reachable through the ipv4 backbone.• The ipv6 address on the tunnel needs to be configured for the tunnel to come up• Both static and dynamic IPv6 routing protocols on top of the tunnel are supported• The tunnel source can be ip address or interface name• Manual tunnels provide static point-point connectivty
