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GbE2c Ethernet Blade Switch Trunk Numbering Issues

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stanley.chiu
Advisor

GbE2c Ethernet Blade Switch Trunk Numbering Issues

Hi there, we have eight of these GbE2c c-Class Blade switches, and we have the following issue on all of them.

Here is a sample config output:

>> Main# info/l2/trunk

Trunk group 1: Enabled
Protocol - Static
port state:
17: STG 1 forwarding
18: STG 1 forwarding

Trunk group 13: Enabled
Protocol - LACP
port state:
20: STG 1 forwarding

Trunk group 14: Enabled
Protocol - LACP
port state:
21: STG 1 forwarding

Trunk group 15: Enabled
Protocol - LACP
port state:
22: STG 1 forwarding

Trunk group 16: Enabled
Protocol - LACP
port state:
23: STG 1 forwarding

You can see that there are trunk groups 1, 13, 14, 15 and 16 defined. The issue is that the switch only allows trunk numbers 1-12 to be modified.

>> Main# cfg/l2/trunk 13
Error: bad trunk group number 13; must be between 1 and 12

If you try to modify trunk group 1, there's no problem:

>> Main# cfg/l2/trunk 1
------------------------------------------------------------
[Trunk group 1 Menu]
add - Add port to trunk group
rem - Remove port from trunk group
ena - Enable trunk group
dis - Disable trunk group
del - Delete trunk group
cur - Display current Trunk Group configuration

We don't know how these trunk groups higher than 12 ever happened, but the real question is what we can do to get rid of them and recreate them with a number 12 or lower.

Thanks!
4 REPLIES
HEM_2
Honored Contributor

Re: GbE2c Ethernet Blade Switch Trunk Numbering Issues

those are dynamic port trunks that were created because lacp is enabled on the ports.

to get rid of them, turn off lacp on the ports.

then you can create a static port trunk if that is what is desired.

make sure that the upstream switch config matches, i.e. is it running dynamic LACP or a static port trunk?
stanley.chiu
Advisor

Re: GbE2c Ethernet Blade Switch Trunk Numbering Issues

Thanks for your reply!

How would we go about making a single LACP trunk group with ports 20-24 included?

Right now, all of our 8 switches has a different configuration. Some have each port in its own trunk group, some have three ports in one trunk group, and one of the switches has it more or less correct, such as the following:

>> Main# info/l2/trunk

Trunk group 13: Enabled
Protocol - LACP
Port State:
21: STG 1 forwarding
22: STG 1 forwarding
23: STG 1 forwarding
24: STG 1 forwarding

How do we add port 20 to that, and then make it the same on all the switches?
HEM_2
Honored Contributor
Solution

Re: GbE2c Ethernet Blade Switch Trunk Numbering Issues

here is the cfg to create a 5 port LACP channel, ports 20-24:

/c/l2/lacp/port 20/mode active
/c/l2/lacp/port 20/adminkey 20
/c/l2/lacp/port 21/mode active
/c/l2/lacp/port 21/adminkey 20
/c/l2/lacp/port 22/mode active
/c/l2/lacp/port 22/adminkey 20
/c/l2/lacp/port 23/mode active
/c/l2/lacp/port 23/adminkey 20
/c/l2/lacp/port 24/mode active
/c/l2/lacp/port 24/adminkey 20

apply
save

then assuming the proper lacp channel config on the upstream switch, a 5 port channel will be formed and trunk 13 will be created on the gbe2c.
stanley.chiu
Advisor

Re: GbE2c Ethernet Blade Switch Trunk Numbering Issues

Thanks for your help. Much appreciated!