Brocade Network Advisor SAN + IP User Manual v12.3.0 - Manual (Page 1295)

Brocade Network Advisor SAN + IP User Manual 1223
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FCIP trunking
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Examples of circuit failover in groups
Tables Table 116 through Table 118 provide examples of how failover occurs on circuits with
different bandwidths configured in failover groups.
Table 116 illustrates circuit failover in a tunnel with two failover groups, each with two circuits. All
data through the tunnel is initially load balanced over Circuits 1 and 2. The following occurs during
circuit failover:
• If circuit 1 fails, circuit 3 becomes active and data is load balanced over circuit 2 and 3.
• If circuit 2 fails, circuit 4 becomes active and data is load balanced over circuit 1 and 4.
• If both circuit 1 and 2 fail, circuit 3 and.4 become active and data is load balanced over both
circuits.
Table 117 illustrates circuit failover in a tunnel with one failover group containing three circuits, In
this case, failover occurs as if circuits are not part of a failover group. Circuit 2 and 3, both with
metric 1, become active only after circuit 1 with metric 0 fails.
Table 118 illustrates circuit failover in a tunnel with circuits in failover groups and circuits that are
not part of failover groups. In this configuration, all data is initially load balanced over circuit.1,
circuit 2, and circuit 3 (when they are all active). The following occurs during circuit failover:
• If circuit1 fails, circuit 4 becomes active and data is load balanced over circuit 2, circuit 3, and
circuit 4.
Reason: Circuit 1 fails over to circuit 4 (both are in failover group 1) and circuit 3 is active with
500Mb bandwidth.
• If circuit 2 fails, data is load balanced over circuit 1 and circuit 3, and no other circuit becomes
active.
Reason: Circuit 1 and 3 are the only active circuits since circuit 4 and 5 only become active
when circuits 3 or 1 fail.
TABLE 116 Tunnel with two failover groups with two circuits
Circuits in tunnel Failover group ID Circuit bandwidth In use for tunnel data
Circuit 1
Metric 0 1 500Mb If active, yes.
Circuit 2
Metric 0 2 1000Mb If active, yes.
Circuit 3
Metric 1 1 500Mb Only when circuit 1
fails.
Circuit 4
Metric 1 2 1000Mb Only when circuit 2
fails.
TABLE 117 Tunnel with one failover groups with three circuits
Circuits in tunnel Failover group ID Circuit bandwidth In use for tunnel data
Circuit 1
Metric 0 1 1000Mb If active, yes.
Circuit 2
Metric 1 1 500Mb Only when circuit 1
fails.
Circuit 3
Metric 1 1 500Mb Only when circuit 1
fails.