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w.kuhn
Beginner

STP loop with LACP channel between Cisco switches

need some help here...

Trying to setup 4 ports lacp channeled between 6500 (CATOS) and 3560 but ports keep going into errdisable.

Here's config with some show output attatched...

Switch_6509

set port lacp-channel 9/26-29 839

set port lacp-channel 9/26-29 mode active

9/26 Switch_3560 gig0/25 errdisable 19 full 1000 10/100/1000

9/27 Switch_3560 gig0/26 errdisable 19 full 1000 10/100/1000

9/28 Switch_3560 gig0/27 errdisable 19 full 1000 10/100/1000

9/29 Switch_3560 gig0/28 errdisable 19 full 1000 10/100/1000

Switch_3560

interface Port-channel1

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 10,19

switchport mode trunk

interface GigabitEthernet0/25

description Uplink to 6509 9/26

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 10,19

switchport mode trunk

speed 1000

duplex full

channel-protocol lacp

channel-group 1 mode active

!

interface GigabitEthernet0/26

description Uplink to 6509 9/27

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 10,19

switchport mode trunk

speed 1000

duplex full

channel-protocol lacp

channel-group 1 mode active

!

interface GigabitEthernet0/27

description Uplink to 6509 9/28

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 10,19

switchport mode trunk

speed 1000

duplex full

channel-protocol lacp

channel-group 1 mode active

!

interface GigabitEthernet0/28

description Uplink to 6509 9/29

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 10,19

switchport mode trunk

speed 1000

duplex full

channel-protocol lacp

channel-group 1 mode active

14 REPLIES 14
Diego Vargas
Cisco Employee

Can you provide the configuration of each one of the ports on the 6509 CATOS?

Everything looks fine on the output but I would need to check that.

Port Name Status Vlan Duplex Speed Type

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

9/26 Switch_3560 gig0/25 errdisable 19 full 1000 10/100/1000

Port AuxiliaryVlan AuxVlan-Status

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

9/26 none none

Port Security Violation Shutdown-Time Age-Time Max-Addr Trap IfIndex

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

9/26 disabled shutdown 0 0 1 disabled 288

Port Flooding on Address Limit Last-Src-Addr Vlan

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

9/26 Enabled - -

Port Num-Addr Secure-Src-Addr Vlan Age-Left Shutdown/Time-Left

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

9/26 0 - - - - -

Port 802.1X Auth-State 802.1X Port-Status

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

9/26 - -

Port Send FlowControl Receive FlowControl RxPause TxPause

admin oper admin oper

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

9/26 desired off off off 0 0

Port Admin Channel LACP Port Ch Partner Oper Partner

key Mode Priority id Sys ID Port

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

9/26 839 active 128 1678 32768:00-23-ea-3f-56-00 25

9/27 839 active 128 1678 32768:00-23-ea-3f-56-00 26

9/28 839 active 128 1678 32768:00-23-ea-3f-56-00 27

9/29 839 active 128 1678 32768:00-23-ea-3f-56-00 28

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

Port Status ErrDisable Reason Port ErrDisableTimeout Action on Timeout

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

9/26 errdisable channel-misconfig Enable No Change

Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize

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

9/26 0 0 0 0 0

Port Single-Col Multi-Coll Late-Coll Excess-Col Carri-Sen Runts Giants

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

9/26 0 0 0 0 0 0 0

Port Last-Time-Cleared

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

9/26 Mon Dec 15 2008, 09:39:03

The other 3 ports show same output.....

set port lacp-channel 9/26-29 839

set port speed 9/26-29 1000

clear trunk 9/26 1-9,11-18,20-4094

set trunk 9/26 nonegotiate dot1q 10,19

clear trunk 9/27 1-9,11-18,20-4094

set trunk 9/27 nonegotiate dot1q 10,19

clear trunk 9/28 1-9,11-18,20-4094

set trunk 9/28 nonegotiate dot1q 10,19

clear trunk 9/29 1-9,11-18,20-4094

set trunk 9/29 nonegotiate dot1q 10,19

set port lacp-channel 9/26-29 mode active

9/26 Switch_3560 gig0/25 errdisable 19 full 1000 10/100/1000

9/27 Switch_3560 gig0/26 errdisable 19 full 1000 10/100/1000

9/28 Switch_3560 gig0/27 errdisable 19 full 1000 10/100/1000

9/29 Switch_3560 gig0/28 errdisable 19 full 1000 10/100/1000

Might try changing the trunk parameter you have nonegotiate on the 6509 side but not on the 3560 side , you would need to add "switchport nonegotiate on the 3560 interfaces. It checks all these parameters . Something to try.

Glen... added switchport nonegotiate to gig0/25-28 on 3560.... enable ports but still same problem.

Cheers

Will

Check your native vlan on both sides looks like it might be 1 on the 3560 side but 19 on the 6500 side. To match them on the 6500 side do a set vlan 1 9/26-29 , then reenable the ports and see what happens.

Thanks Glen...

Having it setup as trunk ports I'd overlooked the need for it to be in same vlan...

Interesting that Trunks are first to be established and no indication of VLAN mismatch (which would have been helpfull).

Thanks for your help...

Cheers

Will

Switch_6509> (enable) set port enable 9/26-29

Ports 9/26-29 enabled.

Switch_6509> (enable) 2009 Jan 15 15:28:27 %DTP-5-TRUNKPORTON:Port 9/26 has become dot1q trunk

2009 Jan 15 15:28:27 %DTP-5-TRUNKPORTON:Port 9/27 has become dot1q trunk

2009 Jan 15 15:28:27 %DTP-5-TRUNKPORTON:Port 9/28 has become dot1q trunk

2009 Jan 15 15:28:27 %DTP-5-TRUNKPORTON:Port 9/29 has become dot1q trunk

2009 Jan 15 15:28:30 %SPANTREE-6-PORTLISTEN: Port 9/26-29 (agPort 14/14) state in VLAN 10 changed to listening

2009 Jan 15 15:28:30 %SPANTREE-6-PORTLISTEN: Port 9/26-29 (agPort 14/14) state in VLAN 19 changed to listening

2009 Jan 15 15:28:44 %SPANTREE-6-PORTLEARN: Port 9/26-29 (agPort 14/14) state in VLAN 10 changed to learning

2009 Jan 15 15:28:44 %SPANTREE-6-PORTLEARN: Port 9/26-29 (agPort 14/14) state in VLAN 19 changed to learning

2009 Jan 15 15:28:59 %SPANTREE-6-PORTFWD: Port 9/26-29 (agPort 14/14) state in VLAN 10 changed to forwarding

2009 Jan 15 15:28:59 %SPANTREE-6-PORTFWD: Port 9/26-29 (agPort 14/14) state in VLAN 19 changed to forwarding

9/26 Switch_3560 gig0/25 connected trunk full 1000 10/100/1000

9/27 Switch_3560 gig0/26 connected trunk full 1000 10/100/1000

9/28 Switch_3560 gig0/27 connected trunk full 1000 10/100/1000

9/29 Switch_3560 gig0/28 connected trunk full 1000 10/100/1000

Might try changing the trunk parameter you have nonegotiate on the 6509 side but not on the 3560 side , you would need to add "switchport nonegotiate on the 3560 interfaces. It checks all these parameters . Something to try.

glen.grant
Advisor

Try bringing down all the ports at once on the 6509 set port disable 9/26-29 and then bring them all up at once set port enable 9/26-29 and see what happens , sometimes if you don't bring up both sides close together on a negotiated etherchannel the switch protects itself by tearing down the channel.

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