Static Trunks; Before Configuring Static Trunks; Static Trunk Group Configuration Rules - Lenovo Flex System Fabric CN4093 Application Manual

Static Trunks

Before Configuring Static Trunks

Static Trunk Group Configuration Rules

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CN4093 Application Guide for N/OS 8.2
When you create and enable a static trunk, the trunk members (switch ports) take
on certain settings necessary for correct operation of the trunking feature.
Before you configure your trunk, you must consider these settings, along with
specific configuration rules, as follows:
 Read the configuration rules provided in the section, "Static Trunk Group
Configuration Rules" on page
Determine which switch ports are to become trunk members (the specific ports

making up the trunk).
 Ensure that the chosen switch ports are set to enabled.
 Ensure all member ports in a trunk have the same VLAN configuration.
 Consider how the existing Spanning Tree will react to the new trunk
configuration. See "Spanning Tree Protocols" on page
guidelines.
Consider how existing VLANs will be affected by the addition of a trunk.

The trunking feature operates according to specific configuration rules. When
creating trunks, consider the following rules that determine how a trunk group
reacts in any network topology:
 All trunks 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 trunk group.
 Any physical switch port can belong to only one trunk group.
 Depending on port availability, the switch supports up to 16 ports in each trunk
group.
 Internal ports (INTx) and external ports (EXTx) cannot become members of the
same trunk group.
Trunking from third‐party devices must comply with Cisco

technology.
 All trunk member ports must be assigned to the same VLAN configuration
before the trunk can be enabled.
 If you change the VLAN settings of any trunk member, you cannot apply the
change until you change the VLAN settings of all trunk members.
 When an active port is configured in a trunk, the port becomes a trunk member
when you enable the trunk. The Spanning Tree parameters for the port then
change to reflect the new trunk settings.
 All trunk 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 trunk ports can belong to multiple STGs.
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145 for configuration
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EtherChannel