7254XSQ SMLT/LACP to Cisco

[bfaltys]

Hello. I’m trying to get an LACP link to come up to a Cisco. I’ve spent too much time looking on Google without the most helpful of results so I’m hoping someone here can help. Here is some of the relevant configuration…

The interfaces on the Cisco:

interface GigabitEthernet1/1/2

switchport mode trunk

logging event trunk-status

channel-protocol lacp

channel-group 10 mode active

interface GigabitEthernet2/1/2

switchport mode trunk

logging event trunk-status

channel-protocol lacp

channel-group 10 mode active

interface Port-channel10

switchport mode trunk

On the VSP:

# LACP CONFIGURATION
#

vlacp enable
lacp smlt-sys-id d4:78:56:xx:xx:xx
lacp enable

# MLT CONFIGURATION
#

mlt 22 enable name "MY-MLT"

# MLT INTERFACE CONFIGURATION
#

interface mlt 22
smlt
lacp enable key 22
exit

interface GigabitEthernet 1/41
name "MLT22"
no shutdown
lacp key 22 aggregation enable
lacp enable
sflow sampling-rate 8192
exit

MY-SWITCH:1(config)#show mlt 22

===============================================================================
                                    Mlt Info
===============================================================================
                                         PORT    MLT        MLT           PORT         VLAN
MLTID IFINDEX NAME      TYPE   ADMIN CURRENT    MEMBERS       IDS
----------------------------------------------------------------------------------------------------
22         6165  MY-MLT     trunk   smlt        norm                                 2222

                          DESIGNATED   LACP      LACP
MLTID IFINDEX  PORTS            ADMIN     OPER
----------------------------------------------------------------------------------------------------
22       6165       null                  enable    down

                                                                                                                WHICH PORTS
                        WHERE        LOCAL                      REMOTE                   PROGRAMMED
MLTID NAME   CREATED    PORT MEMBERS      PORT MEMBERS      IN DATA PATH
----------------------------------------------------------------------------------------------------
22      MY-MLT   LOC & REM                                      NONE

                          ENCAP                                          PVLAN        VID
MLTID IFINDEX  DOT1Q     LOSSLESS   PVLAN     TYPE         TYPE       FLEX-UNI
----------------------------------------------------------------------------------------------------
22       6165       enable      disable               -              -                -            disable

A message I found in the logs:

MY-SWITCH:1(config)#show log file tail
CP1 [02/10/21 12:41:44.739:CST] 0x000ec5d1 00000000 GlobalRouter LACP INFO A churn condition has been detected for port 1/41 as the  PARTNER is out of sync.

[Miguel-Angel_RO]

bfaltys,

Good to see it coming. What was the issue?

The command “vlan mlt 2222 22” is to add the vlan 2222 to the mlt 22.

You should also be able to just add the vlans to the interface.

Regards

Mig

[bfaltys]

Thanks, Mig! I think we’re now good on our side. The 3rd party will hopefully get sorted out today. I can see MACs for the local & vIST peer now. LACP now shows admin “up” as well.

My related config:

mlt 22 enable name NAME

interface mlt 22

smlt

lacp enable key 22

vlan members add 2222 1/41

interface g 1/41

lacp key 22 aggregation enable

lacp enable

As far as allowing VLANs on the link, I had also entered this command, but don’t see it in the config:

vlan mlt 2222 22

Is that not needed in this scenario? Maybe just for “legacy” mlt?

[Miguel-Angel_RO]

bfaltys,

A machine will only do what you ask him.

FYI:

• lacp partner is the 3rd party device (cisco)
• lacp actor is the VSP on which you type the command
• vist peer is the other VSP

If you want to go to debug level, you’ll find here some commands I entered a year ago to debug issues with a 3rd party device. The teeth came easily

1. clear trace
2. trace screen disable
3. show trace modid-list
   1. and look for LACP, it should be 59
4. trace level 59 3
   1. the second number is the trace level:
      1.  <0-4>   Trace level (0-Disabled; 1-Very terse; 2-Terse; 3-Verbose; 4-Very verbose)
5. Perform a connection with the third party device
6. trace shutdown
7. show trace file | include “what ever you want but probably the interface id 1/xx”

Let me know if this is what your were looking for

Mig

[bfaltys]

They’ve double checked the links. I cannot see their MAC on either switch. I’m not sure why this is so complicated. On a Cisco I’d just debug LACP and probably get useful output in a few seconds, but with the VSP it is like pulling teeth to get relevant output. If there is an issue between the 2 VSPs I assume the link won’t come up. Is the “partner” the other VSP or is it the switch at the other end of the link? Even the description of the command options are not helpful.

1#show lacp ?
  actor-admin    Show port lacp actor administrative info
  actor-oper     Show port lacp actor operational info
  extension      Show port lacp timer info
  interface      Show lacp interface info
  partner-admin  Show port lacp partner administrative info
  partner-oper   Show port lacp partner operational info

[bfaltys]

I’m checking with the other side. We don’t own/manage the Cisco.