Fcip Circuit Failover Capabilities - Brocade Communications Systems StoreFabric SN6500B Administrator's Manual

FCIP circuit failover capabilities

Each FCIP circuit is assigned a metric, either 0 or 1, which is used in managing failover from one
circuit to another. FCIP Trunking with metrics uses LLL, and no in flight data is lost during the
failover. If a circuit fails, FCIP Trunking first tries to retransmit any pending send traffic over another
lowest metric circuit. In
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 5
NOTE
Modifying a circuit metric disrupts traffic.
In Figure
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.
Fabric OS FCIP Administrator's Guide
53-1002748-01
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A limit of 10 FCIP circuits can be configured on a single 10 GbE port.
-
A limit of 20 FCIP circuits can be configured per VE port group (12 through 21 or 22
through 31) when using a 10G port. For the 20 circuits, 10 are configured on local ports
and 10 on crossports
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For a FX8-24 blade with a VE_Port group on a 10GbE port, the sum of the maximum
committed rates of that group's circuits cannot exceed 10 Gbps.
NOTE
For any FCIP circuit going over the 10GbE ports, the back-end limit is rounded to the
nearest 1 Gbps increments for each VE_Port group. As an example, a circuit defined as 1.5
Gbps is actually going to consume 2 Gbps of back-end bandwidth. The maximum
aggregate amount is 10 Gbps total.
-
For Adaptive Rate Limiting (ARL), you can configure a maximum rate of 10 Gbps for all
tunnels over a single 10 GbE port and 10 Gbps for any single circuit.
Figure 5
7800
3 2 1
Link loss and retransmission over peer lowest metric circuit
6, circuit 1 is assigned a metric of 0, and circuit 2 is assigned a metric of 1. Both circuits
on page 19, circuit 1 and circuit 2 are both lowest metric circuits.
Circuit 1 - Metric 0 - Active
X
Circuit 2 - Metric 0 - Active
2
FCIP Trunking
7800
3 ? 1
Resend 2
19