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.

[bfaltys]

MY-SWITCH:1(config)#show run mod mlt
Preparing to Display Configuration...
#
# Wed Feb 10 14:06:04 2021 CST
# box type             : VSP-7254XSQ
# software version     : 7.1.0.0
# cli mode             : ECLI
#

#Card Info :

#  Slot 1-2 :
#       CardType          : 7254XSQ
#       CardDescription   : 7254XSQ
#       CardSerial#       : ########
#       CardPart#         : EC720001X-E6
#       CardAssemblyDate  : 20151117
#       CardHWRevision    : 02
#       CardHWConfig      :
#       AdminStatus       : up
#       OperStatus        : up

config terminal

#

# MLT CONFIGURATION
#

mlt 22 enable name "MY-MLT"

#
# VIRTUAL IST CONFIGURATION
#

virtual-ist  peer-ip 192.168.xxx.xxx vlan xxxx

#
# MLT INTERFACE CONFIGURATION
#

interface mlt 22
smlt
lacp enable key 22
exit

end

MY-SWITCH:1(config)#

[Miguel-Angel_RO]

bfaltys,

can you share a show run modu mlt?

For the lacp key, you should use the SMLT id, just for the OPSEC 😉

I would let it as :

mlt 141 enable name Cisco-SMLT

mlt 141 encapsulation dot1q

interface mlt 141

smlt

lacp enable key 141

exit
 

interface GigabitEthernet 1/41

encapsulation dot1q

no shutdown

lacp key 141 aggregation enable

lacp enable

no spanning-tree mstp  force-port-state enable

sflow sampling-rate 8192

no shutdown
exit

Mig

[bfaltys]

When I try to set the mlt encapsulation I get an error (I do have it set on the actual interface though):

MY-SWITCH:1(config)#mlt 22 encapsulation dot1q

Error: Operation not allowed

MY-SWITCH(config)#sh run | b 1/41
interface GigabitEthernet 1/41
encapsulation dot1q

Regarding naming conventions, I just changed them for the sake of OPSEC. 🙂

How can I run a debug for this? I still see the “churn” message showing up in the log file.

Here is what my interfaces look like now:

interface GigabitEthernet 1/41
default-vlan-id 2222
untag-port-default-vlan enable
no shutdown
lacp key 22 aggregation enable
lacp enable
no spanning-tree mstp  force-port-state enable
sflow sampling-rate 8192
exit

[Miguel-Angel_RO]

bfaltys,

SMLT requires to disable the spanning tree on the port:

interface GigabitEthernet 1/41

no spanning-tree mstp force-port-state enable

exit

I think that you forgot the encapsulation:

mlt 22 encapsulation dot1q

Here a working config with a Cisco router:

#

# MLT CONFIGURATION

#

mlt 203 enable name Router

mlt 203 encapsulation dot1q

interface mlt 203

smlt

lacp enable key 203

exit

#

# VLAN CONFIGURATION

#

vlan mlt 100 203

vlan mlt 101 203

vlan mlt 102 203

vlan mlt 103 203

vlan mlt 104 203

# PORT CONFIGURATION - PHASE II

#

interface GigabitEthernet 2/3

lacp key 203 aggregation enable

lacp enable

exit

Try also to follow a naming convention for the MLTs to ease the debug.

MLT on port 1/41 is MLT-141, on port 2/1 is MLT-201, etc.

Regards

Mig

[EXTR_Paul]

Before enabling LACP on the interface…..

Make sure you the VLAN and default VLAN is set on the port.

interface GigabitEthernet 1/41

name "MLT22"
no shutdown
lacp key 22 aggregation enable
lacp enable
sflow sampling-rate 8192
exit