Technical data

12 Fabric OS FCIP Administrator’s Guide

53-1002474-01

FX8-24 blade license options

Bandwidth allocation and restrictions

You cannot configure more than 10 Gbps of dedicated bandwidth on a 10GbE port. This includes

both primary and secondary circuits. Following are two examples to clarify these requirements.

NOTE

In the following examples, configuring VE_Port 12 on xge0 is a crossport configuration. For more

information on crossports, refer to “Configuring crossports” on page 13.

NOTE

The terms “XGE port” and “GbE port” may be used interchangeably in this document.

• VE_Port 12 has two 10 Gbps circuits. Circuit 0 has a metric of 0 on xge1 and circuit 1 has a

metric 1 on xge0. With this configuration, no other tunnels or circuits would be allowed on this

blade because both XGE ports have 10 Gbps of configured bandwidth.

• VE_Port 12 has two 10 Gbps circuits. Circuit 0 has a metric of 0 on xge1, and circuit 1 has a

metric of 1 on xge0. In this case, the configuration is allowed, but you could not create

additional circuits for either VE port group. For the VE_Port 12-21 port group, VE_Port 12 is

consuming 10 Gbps of back end port bandwidth, so additional circuits from another tunnel

could not be created. For the VE_Port 22-31 group, the bandwidth would exceed either the

front end port bandwidth or the crossport bandwidth. Again VE_Port 12 circuit 1 is consuming

10 Gbps of crossport bandwidth and 10 Gbps of front end port bandwidth for xge0, so you

cannot create additional circuits for VE_Port 22-31 group.

Note that there can only be a maximum of 10 Gbps defined over the crossport configuration.

Therefore, in the preceding example, since VE_Port 12 is configured with a single 10 Gbps

circuit over xge0 (which would be the crossport for VE_Port 12-21 group), there can be no other

crossport configurations. You could not configure a crossport for VE_Port 22-31 port group

because VE_Port 12 is using all 10 Gbps bandwidth for xge0. This would also restrict you from

configuring any circuits for VE_Ports 22-31 at all. Therefore, consuming the crossport

bandwidth for primary metric 0 circuits is not recommended. Refer to “Crossport bandwidth

allocation” on page 15 for more information.

Back-end bandwidth

Back-end port bandwidth allocation is calculated as follows:

• Back-end bandwidths are always rounded up to the nearest 1 Gbps. For example, 1.5 Gbps

actually consumes 2 Gbps of back-end bandwidth.

• Each VE_Port group is allocated 10 Gbps of back-end bandwidth (10 Gbps for the VE_Port

12-21 group and 10 Gbps for the VE_Port 22-31 group).

• The total back-end port bandwidth allocation is calculated by adding up the consumed

bandwidth for each FCIP tunnel in the VE_Port group.

• The consumed bandwidth for a given FCIP tunnel is calculated by adding the maximum

committed rates (rounded to the nearest 1 Gbps) for all metric 0 circuits, adding up the

maximum committed rates (also rounded to the nearest 1 Gbps) for all metric 1 circuits, then

taking the greater of the two values.