HP 1606 Fabric OS FCIP Administrators Guide v6.4.0 (53-1001766-01, November 20 - Page 27

Bandwidth calculation during failover, If both circuit 0 and circuit 1 fail

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FCIP trunking 2 In Figure 6, circuit 1 is assigned a metric of 0, and circuit 2 is assigned a metric of 1. Both circuits are in the same FCIP tunnel. In this case, 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 Failover between like metric circuits or between different metric circuits is lossless. 7800 Circuit 1 - Metric 0 - Active Circuit 2 - Metric 1 - Standby 7800 FIGURE 6 Failover to a higher metric standby circuit Bandwidth calculation during failover The bandwidth of higher metric circuits is not calculated as available bandwidth on an FCIP tunnel until all lowest metric circuits have failed. For example, assume the following: • Circuits 0 and 1 are created with a metric of 0. Circuit 0 is created with a maximum transmission rate of 1 Gbps, and Circuit 1 is created with a maximum transmission rate of 500 Mbps. Together, Circuits 0 and 1 provide an available bandwidth of 1.5 Gbps. • Circuits 2 and 3 are created with a metric of 1. Both are created with a maximum transmission rate of 1 Gbps, for a total of 2 Gbps. This bandwidth is held in reserve. • If either circuit 0 or circuit 1 fails, traffic flows over the remaining circuit while the failed circuit is being recovered. The available bandwidth is still considered to be 1.5 Gbps. • If both circuit 0 and circuit 1 fail, there is a failover to circuits 2 and 3, and the available bandwidth is updated as 2 Gbps. • If a low metric circuit becomes available again, the high metric circuits go back to standby status, and the available bandwidth is updated again as each circuit comes online. For example, if circuit 0 is recovered, the available bandwidth is updated as 1 Gbps. If circuit 1 is also recovered, the available bandwidth is updated as 1.5 Gbps. Fabric OS FCIP Administrator's Guide 13 53-1001766-01

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Fabric OS FCIP Administrator’s Guide
13
53-1001766-01
FCIP trunking
2
In
Figure 6
, circuit 1 is assigned a metric of 0, and circuit 2 is assigned a metric of 1. Both circuits
are in the same FCIP tunnel. In this case, 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 Failover between like metric circuits
or between different metric circuits is lossless.
FIGURE 6
Failover to a higher metric standby circuit
Bandwidth calculation during failover
The bandwidth of higher metric circuits is not calculated as available bandwidth on an FCIP tunnel
until all lowest metric circuits have failed. For example, assume the following:
•
Circuits 0 and 1 are created with a metric of 0. Circuit 0 is created with a maximum
transmission rate of 1 Gbps, and Circuit 1 is created with a maximum transmission rate of 500
Mbps. Together, Circuits 0 and 1 provide an available bandwidth of 1.5 Gbps.
•
Circuits 2 and 3 are created with a metric of 1. Both are created with a maximum transmission
rate of 1 Gbps, for a total of 2 Gbps. This bandwidth is held in reserve.
•
If either circuit 0 or circuit 1 fails, traffic flows over the remaining circuit while the failed circuit
is being recovered. The available bandwidth is still considered to be 1.5 Gbps.
•
If both circuit 0 and circuit 1 fail, there is a failover to circuits 2 and 3, and the available
bandwidth is updated as 2 Gbps.
•
If a low metric circuit becomes available again, the high metric circuits go back to standby
status, and the available bandwidth is updated again as each circuit comes online. For
example, if circuit 0 is recovered, the available bandwidth is updated as 1 Gbps. If circuit 1 is
also recovered, the available bandwidth is updated as 1.5 Gbps.
7800
7800
Circuit 1 - Metric 0 - Active
Circuit 2 - Metric 1 - Standby