LAG formation rules
- A port can be a member of only a single LAG, which can be a static, dynamic, or keep-alive LAG.
- Flexible LAG membership: Brocade ICX 7750, Brocade ICX 7450, and Brocade ICX 7250 devices support a maximum of 256 LAGs and each LAG supports a maximum of 16 member ports. However,
Ruckus ICX 7150 device supports a maximum of 128 LAGs and each LAG supports a maximum of 8 member ports. The maximum number of LAG ports is checked when adding ports to a LAG. Ports in a LAG can be on different line card modules in a chassis or on different units in a stack.
NOTEThe Brocade ICX 7750, Brocade ICX 7450 and Brocade ICX 7250 devices can scale only up to a maximum of 2048 LAG ports. The maximum number of LAG ports supported on Ruckus ICX 7150 is 1024 and is also limited to the number of ports on the device.
- Brocade FastIron devices cannot form a LAG between two stacks using a Brocade optical breakout cable because the cable is not supported on a stack.
- All ports configured in a LAG must be of equal bandwidth, for example, all 10 GbE ports.
- All ports configured in a LAG must be configured with the same port attributes.
- LAG formation rules are checked when a static or dynamic LAG is deployed.
- A LAG must have its primary port selected before it can be deployed.
- All ports configured in a LAG must be configured in the same VLAN.
- 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
- Do not share the same protocol-VLAN configuration
- Are configured as mainly primary and secondary interfaces
- Layer 3 requirements:
The LAG is rejected if any of the secondary LAG port has any Layer 3 configurations, such as IPv4 or IPv6 address, OSPF, RIP, RIPng, IS-IS, and so on.
- Layer 4 (ACL) requirements:
All LAG ports must have the same ACL configurations; otherwise, the LAG is rejected.
- All LAG member properties must match the primary port of the LAG with respect to the following parameters:
- Port tag type (untagged or tagged port)
- Port dual-mode
- Default port speed and duplex
- Configured port speed and duplex
- TOS-based configuration: During deployment, the configuration on the primary port is replicated to all ports. On undeployment, each port inherits the same TOS-based QoS configuration.
To change port parameters, you must change them on the primary port. 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 combination of copper and fiber ports, even if they are of the same speed, cannot be members of the same LAG.
- A LAG is supported on 1 GbE,10 GbE, or 40 GbE ports.
- 1 GbE and 10 GbE ports cannot be combined in the same LAG.
- 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).
- Although the FastIron devices have port ranges, they do not apply to LAGs.
- You can select any port to be the primary port of the LAG.
- All the ports must be connected to the same physical or logical device at the other end.
- The sFlow configuration enabled on the primary port of a LAG is applicable to all the LAG ports. Disabling the sFlow on the primary port of a LAG removes the configuration from all the LAG ports.
- Brocade FastIron 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 un-deploy the LAG and maintain the same speed on all ports in the LAG.
NOTEIf 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 un-deploying the LAG where 25 is part of.