Ethernet Switches & Routers

Occasional Contributor
Posts: 18
Registered: ‎03-30-2011

Problem with adding new 1G link to static LAG


I have problem with adding new 1Gb link to existing 3x1Gb LAG (trunk). Switch don't want to accept below command:

BR-telnet@sw03(config)#trunk ethe 0/1/21 to 0/1/24
Error - Trunk/Port does not match: Port 0/1/21 -> Trunk Id 21 But Port
0/1/24 -> Trunk Id 2049

Is any solution to my problem ?

My configuration:

Ports 0/1/21 to 0/1/23 - ports currently active in LAG
Port 0/1/24 - new port which I would like to add to above LAG

Config file:

trunk ethe 0/1/21 to 0/1/24
interface ethernet 0/1/21
port-name r01
load-interval 30
spanning-tree 802-1w admin-pt2pt-mac
no flow-control

Output of 'show trunk' command:

>Configured trunks:

Trunk ID: 21
Hw Trunk ID: 2
Ports_Configured: 3
Primary Port Monitored: Jointly

Ports         0/1/21  0/1/22  0/1/23
Port Names    none    none    none
Port_Status   enable  enable  enable
Monitor       off     off     off
Rx Mirr Port  N/A     N/A     N/A
Tx Mirr Port  N/A     N/A     N/A
Monitor Dir   N/A     N/A     N/A

>Operational trunks:

Trunk ID: 21
Hw Trunk ID: 2
Duplex: Full
Speed: 1G
Tag: Yes
Priority: level0
Active Ports: 3

Ports         0/1/21  0/1/22  0/1/23
Link_Status   active  active  active
port_state    Forward Forward Forward


Copyright (c) 1996-2010 Brocade Communications Systems, Inc.
   UNIT 1: compiled on Feb 16 2011 at 05:19:32 labeled as FGSL07202a
               (3165658 bytes) from Primary FGSL07202a.bin
       SW: Version 07.2.02aT7e1
Boot-Monitor Image size = 416213, Version:05.0.00T7e5 (Fev2)
HW: Stackable FLS624


Super Contributor
Posts: 1,087
Registered: ‎12-13-2009

Re: Problem with adding new 1G link to static LAG

Hi Robert,

     You need to remove the trunk config and re add it, as this mode does not support dynamic insertion of a trunk member.

Follow the procedure below to recreate your 4 port trunk. NOTE - you require DOWNTIME.


Follow the steps given below to configure a trunk group.

1. Disconnect the cables from those ports on both systems that will be connected by the trunk

group. Do not configure the trunk groups with the cables connected.

NOTE If you connect the cables before configuring the trunk groups and then rebooting, the traffic on the ports can create a spanning tree loop.

2. Configure the trunk group on one of the two Layer 2 Switches or Layer 3 Switches involved in the configuration.

NOTE Downtime is incurred when adding a new port to a trunk group. It is suggested that you schedule the addition of ports to a trunk group to minimize downtime and its impact to the production network.

3. Save the configuration changes to the startup-config file.

4. Dynamically place the new trunk configuration into effect by entering the trunk deploy

command at the global CONFIG level of the CLI.

5. If the device at the other end of the trunk group is another Layer 2 Switch or Layer 3 Switch, repeat Steps 2 – 4 for the other device.

6. When the trunk groups on both devices are operational, reconnect the cables to those ports that are now configured as trunk groups, starting with the first port (lead port) of each trunk group.

7. To verify the link is operational, use the show trunk command.



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