Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 248

www.dell.com | support.dell.com Merging SFP+ Ports to QSFP 40G Ports To remove FANOUT mode in 40G QSFP Ports, use the following commands: Command Syntax no stack-unit stack-unit port number portmode quad Command Mode Purpose CONFIGURATION Merge 4-10G ports to a single 40G port. stack-unit: Enter the stack member unit identifier of the stack member to reset. Range: 0 to 5 To display the stack-unit number, enter the show system brief command. port : Enter the port number of the 40GbE QSFP+ port. Valid values on base module: 33 or 37; OPTM SLOT 0: 41 or 45; OPTM SLOT 1: 49 or 53. portmode quad: Identifies the uplink port as a split 10GbE SFP+ port. Then save the configuration and reload the switch. FTOS# write memory FTOS#reload Important Points • You cannot use split ports as stack-link to stack an MXL Switch. • Split ports cannot be a part of any stacked system. • The quad port must be in a default configuration before it can be split into 4x10G ports. • The 40G port is lost in the configuration when the port is split, so be sure the port is also removed from other L2/L3 feature configurations. • The system must be reloaded after issuing the CLI for the change to take effect. MTU Size on an Interface The link MTU is the frame size of a packet. The IP MTU size is used for IP fragmentation. If the system determines that the IP packet must be fragmented as it leaves the interface, FTOS divides the packet into fragments no bigger than the size set in the ip mtu command. In FTOS, MTU is defined as the entire Ethernet packet (Ethernet header + FCS + payload) Because different networking vendors define MTU differently, check their documentation when planning MTU sizes across a network. 246 | Interfaces