Reference Guide

18 Fabric OS FCIP Administrator’s Guide
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FCIP trunking
2
FIGURE 5 Link loss and retransmission over peer lowest metric circuit
NOTE
Modifying a circuit metric disrupts traffic.
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
10GbE lossless failover
Circuit failover is supported between 10GbE circuits on FX8-24 blades when both 10GbE ports are
on the same logical switch and are operating in 10 Gbps mode. Besides configuring secondary
circuits for failover, you can configure a set of IP addresses for circuit failover on crossports.
Crossports are addresses (and routes) that belong to the other 10GbE port’s DP or VE group. In
other words, the crossport for xge0 is xge1 and for xge1, the crossport is xge0. For more
information on crossports and configuring crossports, refer to “Crossports” on page 13.
The benefits of 10GbE lossless failover include the following:
• Provides failover to protect against link or network failure and 10GbE port disable.
• Data will not be lost due to failover.
• Failover supports active-passive and active-active configurations.
• Supported in 10 Gbps mode only.
7800
7800
Circuit 1 - Metric 0 - Active
Circuit 2 - Metric 0 - Active
213
X
13 ?
Resend 2
7800
7800
Circuit 1 - Metric 0 - Active
Circuit 2 - Metric 1 - Standby