Setting the Maximum Number of FIP Login Sessions per FC Fabric
When the QFX Series acts an FCoE-FC gateway, you configure at least one local FC fabric on the gateway. A gateway FC fabric creates associations that connect FCoE devices on an Ethernet network to an FC switch on a Fibre Channel network. Each FC fabric on a gateway includes native FC interfaces (NP_Ports) that connect the gateway to the FC switch. When FCoE devices want to log in to the FC switch, the gateway sends the FIP login requests to the FC switch on the NP_Port links.
You can limit the maximum number of FIP login sessions permitted on a gateway FC fabric. If a QFX3500 switch or QFabric system Node device has more than one FC fabric, limiting the number of login sessions on an FC fabric can prevent one FC fabric from using all of the login sessions available on the device.
The maximum number of FIP sessions depends on whether the gateway FC fabric is trusted or untrusted. When the FC fabric is untrusted, FIP snooping filter overhead restricts the total number of FC fabric FIP sessions to 376 sessions. (This is the combined total of all VN2VF_Port and VN2VN_Port sessions on the system.) When the FC fabric is trusted (fcoe-trusted is configured on the fabric), FIP snooping filters are not created for the sessions, so the number of sessions can be increased.
 | Note: If an FC fabric is untrusted, even if you configure a max-login-sessions value that is higher than 376 for that fabric, the system overrides the configuration and limits the total number of session logins for that FC fabric to 376. |
There are also configurable FIP login session limits that you can apply to the FC fabric NP_Port interfaces and to the QFX3500 switch or QFabric system Node device. To prevent unexpected FIP login rejections:
- The sum of the maximum FIP login sessions on all of the NP_Port interfaces that belong to an FC fabric should not exceed the maximum number of sessions the FC fabric supports or the device supports.
- The sum of the maximum FIP login sessions on all of the FC fabrics on a device should not exceed the maximum number of sessions per device.
- To set a maximum number of FIP login sessions on an FC
fabric using the CLI:
[edit fc-fabrics fc-fabric-name]
user@switch# set max-login-sessions max-login-sessionsFor example, to configure an FC fabric named sanfab1 with a maximum FIP login session limit of 2000 sessions:
[edit fc-fabrics sanfab1]
user@switch# set fc-fabrics sanfab1 max-login-sessions 2000
