Fcip Circuit Failover Capabilities - HP Brocade BladeSystem 4/12 User Manual

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FCIP trunking
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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 83
In Figure
circuit 2 is a standby that is not used unless there are no lowest metric circuits available. If all
lowest metric circuits fail, then the pending send traffic is retransmitted over any available circuits
with the higher metric,
FIGURE 84
248
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
84, circuit 1 is assigned a metric of 0, and circuit 2 is assigned a metric of 1. In this case,
7800
Failover to a higher metric standby circuit
Figure 83, circuit 1 and circuit 2 are both lowest
Circuit 1
X
Circuit 2
Circuit 1 - Metric 0 - Active
Circuit 2 - Metric 1 - Standby
"FCIP circuit
7800
3 ? 1
Resend 2
7800
DCFM Professional User Manual
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