Viewing and configuring port trunk groups (CLI)

​Syntax:

​Example:

In a switch where ports A4 and A5 belong to Trunk 1 and ports A7 and A8 belong to Trunk 2, you have the options shown in Listing specific ports belonging to static trunks and A show trunk listing without specifying ports for displaying port data for ports belonging to static trunks.

Using a port list specifies, for switch ports in a static trunk group, only the ports you want to view. In this case, the command specifies ports A5 through A7. However, because port A6 is not in a static trunk group, it does not appear in the resulting listing:

HP Switch> show trunks e 5-7

 Load Balancing

  Port | Name                    Type      | Group Type
  ---- + ----------------------- --------- + ----- -----
  5    | Print-Server-Trunk      10/100TX  | Trk1  Trunk
  7    |                         10/100TX  | Trk2  Trunk

The show trunks <port-list> command in the above Example: includes a port list, and thus shows trunk group information only for specific ports that have membership in a static trunk. In A show trunk listing without specifying ports, the command does not include a port list, so the switch lists all ports having static trunk membership.

HP Switch> show trunks

 Load Balancing

 Port | Name                    Type      | Group Type
 ---- + ----------------------- --------- + ----- -----
 4    | Print-Server-Trunk      10/100TX  | Trk1  Trunk
 5    | Print-Server-Trunk      10/100TX  | Trk1  Trunk
 7    |                         10/100TX  | Trk2  Trunk
 8    |                         10/100TX  | Trk2  Trunk

​Syntax:

​Example:

Ports A1 and A2 have been previously configured for a static LACP trunk. (For more on the Active parameter, see LACP port status data.)

HP Switch> show lacp

                          LACP
       LACP     Trunk    Port              LACP     Admin  Oper
Port   Enabled  Group    Status   Partner  Status   Key    Key
----   -------  -------  -------  -------  -------  ------ ------ 
Al     Active   Trkl     Up       Yes      Success  0      250
A2     Active   Trkl     Up       Yes      Success  0      250
A3     Active   A3       Down     No       Success  0      300
A4     Passive  A4       Down     No       Success  0      0
A5     Passive  A5       Down     No       Success  0      0
A6     Passive  A6       Down     No       Success  0      0

For a description of each of the above-listed data types, see LACP port status data.

Dynamic LACP trunking enables you to configure standby links for a trunk by including more than eight ports in a dynamic LACP trunk configuration. When eight ports (trunk links) are up, the remaining link(s) will be held in standby status. If a trunked link that is “Up” fails, it will be replaced by a standby link, which maintains your intended bandwidth for the trunk. (Refer to also the “Standby” entry under “Port Status” in "Table 4-5. LACP Port Status Data".) In the next Example:, ports A1 through A9 have been configured for the same LACP trunk. Notice that one of the links shows Standby status, while the remaining eight links are “Up”.

HP Switch> show lacp
                              LACP
       LACP      Trunk    Port                LACP    Admin    Oper
Port   Enabled   Group    Status   Partner   Status   Key      Key
----   -------   -----    ------   -------   ------   ----    -----
Al     Active     Dyn1     Up        Yes     Success   100      100
A2     Active     Dyn1     Up        Yes     Success   100      100
A3     Active     Dyn1     Up        Yes     Success   100      100
A4     Active     Dyn1     Up        Yes     Success   100      100
A5     Active     Dyn1     Up        Yes     Success   100      100
A6     Active     Dyn1     Up        Yes     Success   100      100
A7     Active     Dyn1     Up        Yes     Success   100      100
A8     Active     Dyn1     Up        Yes     Success   100      100
A9     Active     Dyn1    Standby    Yes     Success   100      100

	IMPORTANT: Configure port trunking before you connect the trunked links between switches. Otherwise, a broadcast storm could occur. (If you need to connect the ports before configuring them for trunking, you can temporarily disable the ports until the trunk is configured. See "Enabling or Disabling Ports and Configuring Port Mode".)

The table on Trunk types used in static and dynamic trunk groups describes the maximum number of trunk groups you can configure on the switch. An individual trunk can have up to eight links, with additional standby links if you’re using LACP. You can configure trunk group types as follows:

The following examples show how to create different types of trunk groups.

​Syntax:

​Example:

This Example: uses ports C4 to C6 to create a non-protocol static trunk group with the group name Trk2.

HP Switch(config)# trunk c4-c6 trk2 trunk

	CAUTION: Removing a port from a trunk can create a loop and cause a broadcast storm. When you remove a port from a trunk where spanning tree is not in use, HPE Switch recommends that you first disable the port or disconnect the link on that port.

​Syntax:

​Example:

To remove ports C4 and C5 from an existing trunk group:

HP Switch(config)# no trunk c4-c5

In the default port configuration, all ports on the switch are set to disabled. To enable the switch to automatically form a trunk group that is dynamic on both ends of the link, the ports on one end of a set of links must be LACP Active. The ports on the other end can be either LACP Activeor ​​LACP Passive. The active command enables the switch to automatically establish a (dynamic) LACP trunk group when the device on the other end of the link is configured for LACP Passive.

​Example:

​

Criteria for automatically forming a dynamic LACP trunk

​

​Syntax:

​Example:

This Example: uses ports C4 and C5 to enable a dynamic LACP trunk group.

HP Switch(config)# interface c4-c5 lacp active

To remove a port from dynamic LACP trunk operation, you must turn off LACP on the port. (On a port in an operating, dynamic LACP trunk, you cannot change between LACP Active and LACP passive without first removing LACP operation from the port.)

	CAUTION: Unless ​ spanning tree is running on your network, removing a port from a trunk can result in a loop. To help prevent a broadcast storm when you remove a port from a trunk where spanning tree is not in use, Hewlett Packard Enterprise recommends that you first disable the port or disconnect the link on that port.

​Syntax:

​Example:

Port C6 belongs to an operating, dynamic LACP trunk. To remove port C6 from the dynamic trunk and return it to passive LACP, do the following:

HP Switch(config)# no interface c6 lacp
HP Switch(config)# interface c6 lacp passive

In the above Example:, if the port on the other end of the link is configured for active LACP or static LACP, the trunked link will be re-established almost immediately.