Technical data

20 Fabric OS FCIP Administrator’s Guide

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FCIP trunking

3. Create a tunnel with one circuit going over xge0.

portcfg fciptunnel 8/22 create 192.168.11.20 192.168.11.21 1000000 -–metric 0

4. Add another circuit, going over crossport xge1, to the tunnel.

portcfg fcipcircuit 8/22 create 1 192.168.10.10 192.168.10.11 1000000 -–metric

NOTE

If the source and destination addresses are on different subnets, you must configure IP routes for

the crossport addresses. Refer to “Configuring IP routes with crossports” on page 14.

Failover in TI zones

In Traffic Isolation (TI) zone configurations with failover enabled, non-TI zone traffic will use the

dedicated path if no other E_Port or VE_Port paths exist through the fabric or if the non-dedicated

paths are not the shortest paths. Note that a higher bandwith tunnel with multiple circuits will

become the shortest path compared to a tunnel with one 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. Following is an example.

Assume the following configurations for circuits 0 through 3:

• 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.

The following actions occur during circuit failures:

• 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.