Deleting LACP without Impact beween two Switches (2626 & 2610)

[Snotmann]

Hello guys,

i got a problem. So i have to free a port on one of two siwtches. As you all know the devices called above only got 2 uplink ports per device. In this time there is configured LACP with 2 ethernet connection in a trunk between both switches, but as I told, I need one free GBIC port for a SFP to put another Switch on it.

What is the best way to delete the whole LACP construct, to keep a free port ? Is it possible without customer impact ?

PS: LACP is configured only at the uplink ports 25 & 26 on both devices !

Im happy to hear from you.

Regards,

Daniel

[Richard Litchfield]

Example process (from a 5400, but it is essentially the same):

switch1(config)# sh lacp

LACP

PORT LACP    TRUNK   PORT    LACP    LACP
NUMB ENABLED GROUP   STATUS  PARTNER STATUS
---- ------- ------- ------- ------- -------
B5   Active  Trk4    Up      Yes     Success
B6   Active  Trk4    Up      Yes     Success
B17  Active  Trk3    UP      Yes     Success
B18  Active  Trk3    Up      Yes     Success

switch1(config)# sh vlans ports trk3

Status and Counters - VLAN Information - for ports Trk3

VLAN ID Name | Status Voice Jumbo
------- -------------------------------- + ---------- ----- -----
101 Storage                              | Port-based No Yes

--> Physically disconnect port B17

switch1(config)# sh lacp

LACP

PORT LACP TRUNK PORT LACP LACP
NUMB ENABLED GROUP STATUS PARTNER STATUS
---- ------- ------- ------- ------- -------
B5 Active Trk4 Up Yes Success
B6 Active Trk4 Up Yes Success
B17 Active Trk3 Down No Success
B18 Active Trk3 Up Yes Success

switch1(config)# no trunk b17
switch1(config)# sh lacp

LACP

PORT LACP TRUNK PORT LACP LACP
NUMB ENABLED GROUP STATUS PARTNER STATUS
---- ------- ------- ------- ------- -------
B5 Active Trk4 Up Yes Success
B6 Active Trk4 Up Yes Success
B18 Active Trk3 Up Yes Success

switch1(config)# sh vlans ports b17

Status and Counters - VLAN Information - for ports B17

VLAN ID Name | Status Voice Jumbo
------- -------------------------------- + ---------- ----- -----
1 DEFAULT_VLAN | Port-based No No

Easy! Note the port B17 is now returned to the default VLAN, with extra features like Jumbo turned off.

[Snotmann]

I saw a quit easy way to kill LACP:

#config
no int all lacp

But im not sure if the uplink ports went to the default vlan 1 or it they still stay in trunk mode after that.

And i dont know if it has a traffic impact if i do so, but i think i could disconnect one of the two cable beween the switches, without a traffic effect, because LCAP is active right ?

and then i could configure the disconnected port out of LACP ?!

Here the configs:

Switch 1:

trunk 25-26 Trk1 LACP
ip default-gateway 192.168.124.1
snmp-server community "public" Unrestricted
vlan 1
   name "DEFAULT_VLAN"
   untagged 1-24,Trk1
   ip address 192.168.124.10 255.255.255.0
   exit
fault-finder bad-driver sensitivity high
fault-finder bad-transceiver sensitivity high
fault-finder bad-cable sensitivity high
fault-finder too-long-cable sensitivity high
fault-finder over-bandwidth sensitivity high
fault-finder broadcast-storm sensitivity high
fault-finder loss-of-link sensitivity high
spanning-tree Trk1 priority 4
password manager
password operator

------------------------------------------------------------------------------------------------------

Switch 2:

interface 28
   lacp Active
exit
trunk 25-26 Trk1 LACP
ip default-gateway 192.168.124.1
snmp-server community "public" Unrestricted
vlan 1
   name "DEFAULT_VLAN"
   untagged 1-24,27-28,Trk1
   ip address 192.168.124.11 255.255.255.0
   exit
fault-finder bad-driver sensitivity high
fault-finder bad-transceiver sensitivity high
fault-finder bad-cable sensitivity high
fault-finder too-long-cable sensitivity high
fault-finder over-bandwidth sensitivity high
fault-finder broadcast-storm sensitivity high
fault-finder loss-of-link sensitivity high
fault-finder duplex-mismatch-HDx sensitivity high
fault-finder duplex-mismatch-FDx sensitivity high
spanning-tree Trk1 priority 4
password manager
password operator

[Helper]

hi,

If possible, 1)enable GVRP at both side, vlan learning and tagging will be configured automatically, because with E-Series switch as far as i know you can't configured the physical port if it is part of a virtual port.

2) Extract one port from the LACP/Trunk.

--> STP should block the LAG or the orphan port

3) Then disable LACP for the last port

After that you should be able to do what you want with your SFP ports.

Do not forbade that each time a port will change its state (STP block/forward or LACP load-balancing trafic), you will lose the data trafic using the corresponding port.

Bye.

[Snotmann]

Ok so i think i would be easier and faster for me if i delete LACP if no one is working there, so i would not care if i get a disconnect for a few seconds.

If i use "no int all lacp" ... are the trunk port after that further in trunkmode or single part interfaces ? Else if they are further in trunk mode i can delete it with 

switch1(config)# no trunk 25

switch1(config)# no trunk 26

switch2(config)# no trunk 25

 switch2(config)# no trunk 26

... right ?

So the question is, what i have to do, to delete the LACP and get the ports out of the trunk into vlan1 ?

[Mark Wibaux]

You can have a trunk configured with just one port in it.

Disconnect one port from the trunk (at one end of the link). This is just so you can see which ports you need to remove from the trunk

Just do the command "no trunk 25" (or "no trunk 26") to free up one of the ports from the current trunk. Complete this on both switches.

This should then leave the current trunk with just one port in it and all its VLAN asignements still correct.

The port you removed from the trunk should have reverted to being untagged in VLAN 1 and you can now do whatever other configuration you need on it to support whatever system you are connecting to it.

[Snotmann]

Ah ok. I already do so yesterday evening and it works fine. With a disconnect ... but it works fine for me.

Thanks a lot guys !