7.3.2 Stack port and stack link

A stacking port is a port that connects the member switches that make up the stack. The following table describes the port types and port specification ranges for stacking ports for each model.

Table 7-2: Port types and port specification ranges that can be used as stack ports for each model

Model	Port type of stacking port	Stack port specification range
AX2630S-24T4XW	SFP+/SFP shared	29~30
AX2630S-24P4XW
AX2630S-48T4XW		53~54
AX2630S-48P4XW

A stack link is a connection between two member switch stack ports. Connect the stack link directly on the line. Do not connect any other network device between the stacking ports that connect the two member switches.

A stack link is required for two member switches. It is recommended to set two stack links. Redundancy on two stack links ensures that if a particular stack link fails, it continues to operate on the remaining stack links.

If there are two stack links, the stack link load balances communication between the member switches. At this time, if the communication performance between stack links differs, there is a high risk that packets resulting from load balancing are discarded. When configuring two stack links, make sure that the direct attach cable and the transceiver type (SFP+/SFP) used for the stack ports are the same, and that the line speeds are the same.

Refer to the "Hardware Instruction Manual" for the connection specifications of the stack link.

The stack port is set by stack parameter of the configuration command switchport mode.

Ports configured as stacking ports can only be used as stacking ports. Also, ports configured for stacking ports are not included in ports used by other functions.

All functions, including LLDP,UDLD, cannot be used because the functions and stacking ports cannot coexist. Also, the port information by the operation command is not displayed.

For an Ethernet interface used as a stack port, only the following configuration commands can be set.

• bandwidth

• description

• no snmp trap link-status

• shutdown

Configuration commands other than the above are the operation when the command is omitted. However, note that the following configuration commands do not operate when the command is omitted:

• flowcontrol

  Both receive and transmit operations are off.

• link debounce

  The link-down detection time is unique to the stack port.

• mtu

  MTU is stack-specific. It is not affected by the setting of the configuration command system mtu.

• Speed and duplex

  Speed and duplex are fixed as shown in the following table depending on the transceiver to be inserted.

  Table 7-3: speed and duplex settings for each transceiver

  Transceiver	speed	duplex
  SFP	auto	auto
  SFP-T	auto	auto
  SFP+	10G	full