Problem with LACP between SX550X and C3750

[Inaki Kortazar]

Hi!

I´m trying to connect two Cisco stack through 1 LACP of 4 Ten Gigabit Ethernet fiber ports (2 ports on each device)

One stack is made of 3 C3750X-48 devices and the other one is made of 2 SX550Z-16FT.

I tried to connect them through a port channel but I am having problems with the SX550Z side.

Are CLI commands different in this type of switches? it does not recognice commands like show ip int brief.

(config)#interface range TenGigabitEthernet2/0/9-10

(config-if-range)#channel-group 11 mode auto

sw-be-CPD1(config)#interface port-channel 11
sw-be-CPD1(config-if)#switchport mode trunk
sw-be-CPD1(config-if)#exit

I get this information when show run (show etherchannel summary does not work in this device..)

interface TenGigabitEthernet2/0/9
channel-group 11 mode on
!
interface TenGigabitEthernet2/0/10
channel-group 11 mode on
!
interface Port-Channel11
spanning-tree link-type point-to-point
switchport mode trunk
macro description switch
!next command is internal.
macro auto smartport dynamic_type switch

#show interfaces status

Ch Type Duplex Speed Neg control State
-------- ------- ------ ----- -------- ------- -----------
Po11 10G Full 10000 Enabled Off Up          -----SPEED SHOULD BE 20000, DOESNT IT?

Thank you and Regards

[balaji.bandi]

if you want to EtherChannel to be LACP make below change.

channel-group 11 mode active

show EtherChannel 11 summary will give you how many port up and participated in Port-channel.

[Inaki Kortazar]

Hello BB
Thank you for your help
channel-group 11 mode has justo two modes on and auto..

[balaji.bandi]

Sorry maybe some limitation - then I go with control

channel-group 11 mode on both the side.

also, post-show EtherChannel 11 summary to look

[Inaki Kortazar]

Hello

Both sides has channel group 11 mode on on their ports ,but the message is new for me..

sw-be-034(config-if-range)#channel-group 11 mode on
18-Jun-2019 05:41:54 %2SWTRUNK-I-TRNKPORTPARAM: auto-negotiation/adv. capabilities of port te2/0/9 differ from auto-negotiation/adv. capabilities of Po11
18-Jun-2019 05:41:54 %TRUNK-I-PORTADDED: Port te2/0/9 added to Po11
18-Jun-2019 05:41:54 %STP-W-PORTSTATUS: te2/0/10: STP status Forwarding
18-Jun-2019 05:41:54 %2SWTRUNK-I-TRNKPORTPARAM: auto-negotiation/adv. capabilities of port te2/0/9 differ from auto-negotiation/adv. capabilities of Po11
18-Jun-2019 05:41:54 %LINK-I-Up: Po11
18-Jun-2019 05:41:54 %2SWTRUNK-I-TRNKPORTPARAM: auto-negotiation/adv. capabilities of port te2/0/10 differ from auto-negotiation/adv. capabilities of Po11
18-Jun-2019 05:41:54 %TRUNK-I-PORTADDED: Port te2/0/10 added to Po11
sw-be-034(config-if-range)#18-Jun-2019 05:41:55 %STP-W-PORTSTATUS: Po11: STP status Forwarding

show Etherchannel 11 summary command does not work in these devices  (at least,not in console connection)

I can see something similar in the following command:

sw-be-035#show interfaces port-channel

Load balancing: src-dst-mac.

Gathering information...
Channel Ports
------- -----
Po11 Active: te1/0/9-10

sw-be-035#show interfaces status

Port Type Duplex Speed Neg ctrl State Pressure Mode
-------- ------------ ------ ----- -------- ---- ----------- -------- -------
te1/0/9 10G-Fiber Full 10000 Disabled Off Up Disabled Off
te1/0/10 10G-Fiber Full 10000 Disabled Off Up Disabled Off

Ch Type Duplex Speed Neg control State
-------- ------- ------ ----- -------- ------- -----------
Po11 10G Full 10000 Enabled Off Up   -----  should it be 20000 I guess

Thank you and Regards

[Deepak Kumar]

Hi,

As you are looking at is Speed 10000.  It is showing correctly. If you will look at the bandwidth then it will show you the double or multiply with your interfaces and interface speed.

sho interfaces port-channel 5
Port-channel5 is up, line protocol is up (connected)
Hardware is EtherChannel, address is xxx.xxx.xxx (bia xxx.xxx.xxx)
Description: ToCore
MTU 1500 bytes, BW 20000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 10Gb/s, link type is auto, media type is

Example copied from the 10G links but the method will be the same.

[balaji.bandi]

Sorry, I was more referring to the command on Cat 3750 model, you are right, the command is different in SMB switches.

here is a guide :

https://www.cisco.com/c/en/us/support/docs/smb/switches/cisco-550x-series-stackable-managed-switches/smb5848-configuring-lag-settings-on-a-switch-through-cli.html#LAGConfigurationProcedure

can you post-show interface port-channel 11 - should give you output what you looking for