Fcip Trunk Configuration Considerations; Fcip Circuit Failover Capabilities - Brocade Communications Systems Brocade BladeSystem 4/24 User Manual

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FCIP Trunk configuration considerations

FCIP Trunk configuration considerations
There are several points to consider when configuring an FCIP trunk:
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FCIP circuit failover capabilities

Each FCIP circuit is assigned a metric, which is used in managing failover for FC traffic. Typically,
the metric will be either 0 or 1. If a circuit fails, FCIP Trunking tries first to retransmit any pending
send traffic over another lowest metric circuit. In
metric circuits. Circuit 1 has failed, and transmission fails over to circuit 2, which has the same
metric. Traffic that was pending at the time of failure is retransmitted over circuit 2. In order
delivery is ensured by the receiving 7800 switch.
FIGURE 150
380
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
failover capabilities".
The maximum bandwidth for a single circuit is 1 Gbps. To utilize the entire bandwidth of an
XGE (10GbE) port, you must create ten 1 Gbps circuits.
7800
3 2 1
Link loss and retransmission over peer lowest metric circuit
Figure 150, circuit 1 and circuit 2 are both lowest
Circuit 1
X
Circuit 2
"FCIP circuit
7800
3 ? 1
Resend 2
DCFM Enterprise User Manual
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