HP Brocade BladeSystem 4/12 Brocade Network Advisor SAN User Manual v11.1x (53 - Page 679

FCIP trunking 20 Document Title xx-xxxxxxx-01 FCIP Circuits 10.0.0.2 10.0.0.3 10.0.0.4 10.0.0.5 IP Router 10.0.0.1 FIGURE 282 FCIP tunnel and FCIP circuits WAN IP Router 10.0.1.1 FCIP Tunnel FCIP Circuits 10.0.1.2 10.0.1.3 10.0.1.4 10.0.1.5 Design for redundancy and fault tolerance Multiple FCIP tunnels can be defined between pairs of 8 Gbps extension switches and 8 Gbps extension Blades, but doing so defeats the concept of a multiple circuit FCIP tunnel. Defining two tunnels between a pair of switches or blades rather than one tunnel with two circuits is not as redundant or fault tolerant as having one multiple circuit tunnel. FCIP tunnel restrictions for FCP and FICON emulation features Multiple FCIP tunnels are not supported between pairs of 8 Gbps extension Switches and 8 Gbps extension Blades when any of the FICON or FCP emulation features are enabled on the tunnel unless TI Zones or LS/LF configurations are used to provide deterministic flows between the switches. The emulation features require deterministic FC Frame routing between all initiators and devices over multiple tunnels. If there are non-controlled parallel (equal cost) tunnels between the same SID/DID pairs, emulation (Fast Write, Tape Pipelining, IBM z/OS Global Mirror (z Gm) or FICON Tape Pipelining) will fail when a command is routed via tunnel 1 and the responses are returned via tunnel 2. Therefore multiple equal cost tunnels are not supported between the switch pairs when emulation is enabled on any one or more tunnels without controlling the routing of SID/DID pairs to individual tunnels using TI Zones or LS/LF configurations. FCIP Trunk configuration considerations There are several points to consider when configuring an FCIP trunk: • Each FCIP circuit is assigned a pair of IP addresses, one source IP address, and one destination IP address. • The source IP address is used to determine which GbE interface to use. The GbE IP address must be on the same IP subnet as the source IP address. IP subnets cannot span across the GbE interfaces. • The destination IP address is used to determine routing. If the destination IP address is also on the same subnet as the GbE interface, packets are routed over that subnet. If the destination IP address is on a different subnet, traffic must be routed to an IP gateway address. • An FCIP circuit can have a maximum commit rate of 1,000,000 Kbps. 635