Reference Guide

Fabric OS FCIP Administrator’s Guide 17
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FCIP trunking
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• Tunnel and circuit requirements for 7800 extension switches:
- You can define up to eight IP addresses for a GbE port.
- The 7800 switch contains up to six GbE ports. You can configure up to six circuits per
tunnel spread out over any of these ports.
- Total circuits per switch cannot exceed 24 (total of four circuits for all GbE ports).
- Each circuit requires a unique IP address.
- A single FCIP circuit cannot exceed 1 Gbps capacity.
• Tunnel and circuit requirements for FX8-24 extension blades:
- You can define up to eight IP addresses for a GbE port.
- You can configure up to ten circuits for an FCIP tunnel.
- The FX8-24 blade contains two 10GbE ports. You can define up to ten circuits per FCIP
tunnel spread across the 10GbE ports.
- The FX8-24 blade contains ten 1GbE ports. You can define up to ten circuits per FCIP
tunnel spread across the 1GbE ports.
- A limit of four FCIP circuits can be configured on a single 1 GbE port.
- A limit of ten FCIP circuits can be configured on a single 10 GbE port.
- A limit of twenty FCIP circuits can be configured per VE port group (12 through 21 or 22
through 31) when using a 10G port. For the twenty circuits, ten are configured on local
ports and ten on crossports
- 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 primary circuits cannot exceed 10 Gbps. This same limit
applies to secondary circuits.
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.
- For Adaptive Rate Limiting (ARL), you can configure a maximum rate of 10 Gbps combined
for all tunnels over a single 10 GbE port and 10 Gbps for any single circuit.
FCIP circuit failover capabilities
Each FCIP circuit is assigned a metric, either 0 or 1, which is used in managing failover for FC
traffic. If a circuit fails, FCIP trunking first tries to retransmit any pending send traffic over another
lowest metric circuit. In Figure 5 on page 18, circuit 1 and circuit 2 are both lowest metric circuits.
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.