Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 558

www.dell.com | support.dell.com FTOS Behavior: Stacking configuration is handled as follows on an MXL 10/40GbE Switch: • If a stack unit goes down and is removed from the stack, the logical provisioning configured for the stack-unit number is saved on the master and standby switches. • When you add a new unit to the stack and the stack already has an existing member unit with the same stack-unit number, the new unit is assigned the smallest available unit number (0 to 5). A configuration mismatch between the newly added unit and a logically provisioned unit occurs in the following situations: • The logical provisioning for the unit number configures FlexIO module ports for 4x10GbE operation and the added unit has FlexIO Module ports operating in 40GbE mode. • 'The logical provisioning for the unit number and the added unit have different stack groups configured. When a configuration mismatch occurs, the newly added switch enters into a Card-Problem state and is disabled. A syslog error message is generated. To restore a stacked switch in a Card-Problem state, refer to Stack Unit in Card-Problem State Due to Configuration Mismatch. • A stack unit can also enter a Card-Problem state after a split-stack reload in which a unit that was previously neither the master nor standby is elected as the new master and has logical stack-unit provisioning configured for a stack-unit number that creates a mismatch with the stack-unit numbering on other units. Converting 4x10GbE Ports to 40GbE for Stacking Stacking is supported only on 40GbE links by connecting 40GbE ports on the base module or a 2-Port QSFP+ module. However, on a 2-Port 40GbE QSFP+ module, the ports operate by default in 4x10GbE (quad) mode with breakout cables as eight 10GbE ports. To change a port from 4x10GbE to 40GbE mode of operation for stacking, use the no stack-unit port portmode quad command (Figure 31-7). After you convert the 4x10GbE ports to 40GbE, you must save the configuration and reload the stack for the change to take effect. Figure 31-7. no stack-unit port portmode quad Command Example FTOS(conf)# no stack-unit unit-number port port-number portmode quad Where: stack-unit unit-number is the unit ID number in the stack unit. Valid values: 0 to 5. To display the stack-unit number, use the show system brief command. port port-number specifies the port number of the QSFP+ port to be converted to 40GbE mode. Valid values are: base-module ports: 33 or 37; slot 0: 41 or 45; slot 1: 49 or 53 (refer to Figure 31-5). portmode quad identifies the port as a split 10GbE SFP+ port. Removing a Port from the Stacking Mode To remove a 40GbE port from the stack, use the no form of the stack-unit unit-number stack-group number command. After entering the command, save the configuration and reload the stack for the change to take effect. 556 | Stacking