246 | Interfaces
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Merging SFP+ Ports to QSFP 40G Ports
To remove FANOUT mode in 40G QSFP Ports, use the following commands:
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.
Command Syntax Command Mode Purpose
no stack-unit stack-unit port
number portmode quad
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 <port number>: 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
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