Valid-stack-port Sets

RUCKUS stacking systems support flexible stacking ports. Most platforms allow users to select stacking ports from a list of ports. The ports that are not used as stacking ports can be used as data ports. The stacking port selection cannot be arbitrary. It must follow rules that respect the defined valid-stack-port set (a/b/c, a/b/d, n), where a/b/c and a/b/d are the starting ports of two directions, and n is the maximum number of ports in a stacking trunk. Some platforms support multiple valid-stack-port sets.

RUCKUS supports linear or ring topologies. A unit has one direction (in a typical linear topology) or two directions (in a ring). Each direction contains one or multiple stacking ports. The command stack-port unit/slot/port contains one port, and the command stack-trunk unit/slot/port to unit/slot/port uses multiple contiguous ports.

In FastIron 08.0.90 or later, you must observe the following rules to configure the stack-port or stack-trunk command related to the valid-stack-port set.

Note:
Because this section uses examples for ICX 7750 devices, it needs to be revised to use another model.
The examples given apply to ICX 7750 devices. Valid-stack-port sets for different ICX models differ and are provided in the stacking overview for each device. Every ICX 7750 device has six valid-stack-port sets. The three most common sets are (x/2/1, x/2/4, 3), (x/3/1, x/3/4, 3), and (x/2/1, x/3/1, 6), where x represents a stack ID, and the third number in each set specifies the maximum number of ports in a stacking trunk.

  • A stack-port must be a port in the valid-stack-port set. For example, the configuration stack-port 1/2/4 is allowed, but stack-port 1/2/2 is not allowed.
  • A stack-trunk must contain contiguous ports starting from one port in the valid-stack-port set. For example, the configuration stack-trunk 1/3/1 to 1/3/5 satisfies the valid-stack-port set (x/2/1, x/3/1, 6), but the configuration stack-trunk 1/3/2 to 1/3/4 is invalid.
  • The number of ports in a stack-trunk configuration cannot exceed the number defined in the valid-stack-port set.
  • The stack-port and the stack-trunk configuration for a unit must originate from the same valid-stack-port set. For example, the configuration stack-port 1/2/1 and stack-trunk 1/3/1 to 1/3/6 satisfies the valid-stack-port set (1/2/1, 1/3/1, 6). The configuration stack-port 1/2/1 and stack-port 1/3/4 is invalid because the two stacking ports originate in different valid-stack-port sets.
  • Adding stack-port or stack-trunk configuration may cause the removal of existing stack-port or stack-trunk configuration if the new configuration is not contained in the same valid-stack-port set. For example, suppose a unit configuration contains stack-port 1/2/1 and stack-port 1/2/4. If you configure stack-port 1/3/1, the system removes stack-port 1/2/4 and keeps 1/2/1 because port 1/2/1 and port 1/3/1 satisfy the valid-stack-port set (1/2/1, 1/3/1, 6). If you configure stack-port 1/3/4, the system removes both old stack-ports because no valid-stack-port set contains both the ports in the new configuration, 1/2/x and 1/3/4.
  • If adding stack-port or stack-trunk configuration would cause the removal of a live stacking port or stacking trunk, the command entry is denied. For example, suppose a unit has a live link 1/3/1 to another unit. If you were to configure stack-port 1/2/4, it would cause the removal of 1/3/1 because the port combination (1/2/4, 1/3/1) is not contained in any valid-stack-port set. In this case, the system prints an error message and denies the configuration as shown in the following example. 
    ICX7750-26Q Router# configure terminal
ICX7750-26Q Router(config)# stack unit 1
ICX7750-26Q Router(config-unit-1)# stack-port 1/2/4
Error! It may break the link 1/3/1 -- 2/3/1.
If the link is not needed, please unplug cables and remove the configuration of both ends.
stack-port 1/2/4 would remove stack-port 1/3/1 to satisfy (1/2/1, 1/2/4, 3).

Parent topic: Changes to Stacking in FastIron Release 08.0.90