LAG formation rules

  • A port can be a member of only a single LAG, which can be a static, dynamic, or keep-alive LAG.
  • Ruckus ICX devices cannot form a LAG between two stacks using a Ruckus optical breakout cable because the cable is not supported on a stack.
  • All ports configured in a LAG must be of the same configured speed, for example, all AUTO or 1g or 10g and so on.
  • All ports configured in a LAG must be of the same operational speed.
  • LAG formation rules are checked when a static or dynamic LAG is operational.
  • All ports configured in a LAG must be configured in the same VLAN.
  • All ports configured in a LAG must be configured with the same port attributes. Layer 2 , Layer 3 and Layer 4 (ACL) requirements are listed below:
  • Layer 2 requirements:
    The LAG is rejected if the LAG ports:
    • Do not have the same untagged VLAN component
    • Do not share the same VLAN membership or do not share the same uplink VLAN membership
    • Are configured as member ports of another LAG
  • Layer 3 requirements:

    The LAG is rejected if any of the member port has any Layer 3 configurations, such as IPv4 or IPv6 address, OSPF, RIP, RIPng, IS-IS, route-only, and so on.

  • Layer 4 (ACL) requirements:

    All LAG ports must have the same ACL configurations; otherwise, the LAG is rejected.

  • Properties of the member ports that are being added to the LAG must be identical with respect to the following parameters:
    • Port tag type (untagged or tagged port)
    • Port dual-mode
    • Configured port speed and duplex
    • Operational port speed and duplex
    • LAG is formed with different speed capability ports, but the speed change is supported only to the least common speed port.
    • TOS-based configuration: On deletion of the LAG, each port inherits the same TOS-based QoS configuration.

    To change port parameters, you must change them on the LAG virtual interface. The software automatically applies the changes to the other ports in the LAG.

  • The device on the other end of the LAG link must support the same number of ports in the link.
  • A LAG is supported on 1G, 2.5G, 5G, 10G, 40G, and 100G ports.
  • LAG is formed with ports which have different speed capabilties. The speed change is supported to the least common speed possible among the physical port.
  • Port assignment on a module need not be consecutive. The port range can contain gaps. For example, you can configure ports 1, 3, and 4 (excluding 2).
  • All the ports must be connected to the same physical or logical device at the other end.
  • The sFlow configuration can be enabled on an individual port within a LAG. sFlow cannot be configured on LAG virtual interface. sFlow must be configured under LAG mode for each of the member ports separately.
  • LAG virtual interface or any member ports of the LAG cannot be configured as sFlow source.
  • Ruckus ICX 7450 devices do not support change in speed of a 2.5G paired port, if at least one of the port is part of a LAG. To resolve this issue, you need to delete the LAG and maintain the same speed on all ports in the LAG.
    If both the ports are 2.5G, and one of the ports is not part of a LAG, then the device does not allow speed change on this port as well. For example: 25 and 26 is a 2.5G port pair. If 25 is part of a LAG, then the device does not change the speed to 26 without deleting the LAG where 25 is part of.