Brocade Communications Systems Network Advisor 12.3.0, Руководство пользователя

Страница: 989 / 1940

Brocade Network Advisor SAN User Manual 937
53-1003154-01
FCIP trunking
22
FCIP tunnel restrictions for FCP and FICON emulation features
Multiple FCIP tunnels are not supported between pairs of Extension Switches and 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.
•
In a scenario where a FCIP tunnel has multiple circuits of different metrics the data will flow
over the lower metric circuits unless a failover condition occurs, as described in
“FCIP circuit
failover capabilities” .
•
The maximum bandwidth for a single circuit is 1 Gbps. However, a maximum of 10 Gbps per
circuit is allowed between 10 GbE ports on 8 Gbps Extension Blades when both blades are
running Fabric OS 7.0 or greater.