Static Lags; Before Configuring Static Lags; Static Lag Configuration Rules - Lenovo CN4093 Application Manual

Static LAGs

Before Configuring Static LAGs

Static LAG Configuration Rules

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CN4093 Application Guide for N/OS 8.3
When you create and enable a static LAG, the LAG members (switch ports) take on
certain settings necessary for correct operation of the aggregation feature.
Before you configure your LAG, you must consider these settings, along with
specific configuration rules, as follows:
 Read the configuration rules provided in the section,
Rules" on page 142."
Determine which switch ports are to become LAG members (the specific ports

making up the LAG).
Ensure that the chosen switch ports are set to enabled.

 Ensure all member ports in a LAG have the same VLAN configuration.
 Consider how the existing Spanning Tree will react to the new LAG
configuration. See "Spanning Tree Protocols" on page 151
guidelines.
Consider how existing VLANs will be affected by the addition of a LAG.

The aggregation feature operates according to specific configuration rules. When
creating LAGs, consider the following rules that determine how a LAG reacts in
any network topology:
 All LAGs must originate from one network entity (a single device or multiple
devices acting in a stack) and lead to one destination entity. For example, you
cannot combine links from two different servers into one LAG.
 Any physical switch port can belong to only one LAG.
 Depending on port availability, the switch supports up to 16 ports in each LAG.
 Internal ports (INTx) and external ports (EXTx) cannot become members of the
same LAG.
 Aggregation from third-party devices must comply with Cisco
technology.
 All LAG member ports must be assigned to the same VLAN configuration
before the LAG can be enabled.
 If you change the VLAN settings of any LAG member, you cannot apply the
change until you change the VLAN settings of all LAG members.
 When an active port is configured in a LAG, the port becomes a LAG member
when you enable the LAG. The Spanning Tree parameters for the port then
change to reflect the new LAG settings.
 All LAG members must be in the same Spanning Tree Group (STG) and can
belong to only one Spanning Tree Group (STG). However if all ports are tagged,
then all LAG ports can belong to multiple STGs.
"Static LAG Configuration
for configuration
®
EtherChannel
®