Setting the Maximum Number of FIP Login Sessions per FC Interface
When the switch acts an FCoE-FC gateway, NP_Ports are the native FC interfaces the gateway uses to connect to the FC switch. You can limit the maximum number of FIP login sessions permitted on an NP_Port interface. Limiting the number of login sessions on an interface can prevent login session rejections caused when the connected FC switch port configuration limits the number of FIP login sessions.
 | Tip: A good practice is to configure a maximum number of login sessions on each NP_Port that is less than or equal to the maximum number of login sessions permitted on the connected FC switch port. |
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.) Therefore, the maximum number of FIP login sessions any NP_Port interface in an untrusted fabric can have is 376 sessions. 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 an NP_Port interface in that fabric, the system overrides the configuration and limits the total number of session logins for that interface to 376. |
There are also configurable FIP login session limits that you can apply to the gateway FC fabric 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.
- To set a maximum number of FIP login sessions on an NP_Port
using the CLI:
[edit fc-fabrics fc-fabric-name interface interface-name]
user@switch# set max-login-sessions max-login-sessionsFor example, to configure NP_Port interface fc-0/0/5 with a maximum FIP login session limit of 500 sessions on an FC fabric named sanfab1:
[edit fc-fabrics sanfab1]
user@switch# set interface fc-0/0/5 max-login-sessions 500
