Technical data

Fabric OS FCIP Administrator’s Guide 33
53-1002474-01
Configuration preparation
2
• The Neighbor Discovery ICMPv6 Solicitations and Advertisements are transmitted to the Layer
2 Ethernet multicast MAC address derived from the IPv6 source address (RFC 2464).
• ICMPv6 message types in RFC 4443 and ICMPv6 message types used for Neighbor Discovery
are supported.
• Path MTU Discovery (RFC 1981) is not supported on this implementation, requiring static
configuration of MTU size. The maximum MTU supported is 1500 bytes (including the 40-byte
fixed IPv6 header), the same as for IPv4. The minimum MTU allowed is 1280 bytes (including
the 40-byte fixed IPv6 header). Any network used for IPv6 FCIP circuits must support an MTU of
1280 bytes or larger. IPv6 fragmentation is not supported. The Layer 4 protocol ensures that
the PDU is less than the MTU (including headers).
• The IPv6 addressing currently cannot be used when implementing IPsec.
IPv6 with embedded IPv4 addresses
Only IPv4-compatible IPv6 addresses are supported. Only the low-order 32 bits of the address can
be used as an IPv4 address (high-order 96 bits must be all zeros). This allows IPv6 addresses to be
used on an IPv4 routing infrastructure that supports IPv6 tunneling over the network. Both
endpoints of the circuit must be configured with IPv4-compatible IPv6 addresses. IPv4-to-IPv6
connections are not supported. IPv4-mapped IPv6 addresses are not supported, because they are
intended for nodes that support IPv4 only when mapped to an IPv6 node.
Configuration preparation
Before you begin to configure FCIP, do the following:
• Determine the amount of bandwidth that will be required for the RDR, FICON, or tape
application to be deployed.
• The WAN link has been provisioned and tested for integrity.
• Cabling within the data center has been completed.
• Equipment has been physically installed and powered on.
• Make sure you have admin access to all switches and blades you need to configure.
• For the 7800 switch, determine if copper or optical ports will be used for GbE ports 0 and 1.
• For the FX8-24 blade, determine which of the three possible GbE port operating modes will be
used.
• Determine which 10GbE crossports on FX8-24 blades should get active versus passive or
active versus active configurations.
• Obtain IP addresses for each GbE port you intend to use, plus the netmask and MTU size.
NOTE
The 7800 switch and FX8-24 blade support a maximum MTU size of 1500.
• Determine the gateway IP address and netmask as needed for each route across the WAN.
• Determine if there is any reason to turn off selective acknowledgement (SACK). Because SACK
improves performance for most installations, it is turned on by default.
• Determine the VE_Port numbers you want to use. The VE_Port numbers serve as tunnel IDs.