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Creating port channel from a VSS 4500x pair to a DELL VLT pair

darant
Level 1
Level 1
Hello,
 

We are currently trying to install a pair of DELL S4128F-ON configured as VLT peers  and trying to connect them to the core 4500x VSS pair to act as access switches for a proxmox infra (to be able to create linux bonded interfaces) . I configured 1 port-channel (one link each switch) on the VLT pair and connected these 2 interfaces to one port-channel on the VSS switch but i can't ping the DELL switch.

like this

Capture d’écran 2023-01-11 à 09.11.00.png

here's my config on the Cisco VSS cluster

interface Port-channel23

 description *** Lien vers DELL peer ***

 switchport

 switchport trunk allowed vlan 100,200

 switchport mode trunk

 storm-control broadcast level 5.00

 

interface TenGigabitEthernet1/1/23

description *** trunk link to DELL peer 1***

 switchport trunk allowed vlan 100,200

 switchport mode trunk

 storm-control broadcast level 5.00

 channel-group 23 mode on

 

interface TenGigabitEthernet2/1/23

description *** trunk link to DELL peer 2***

 switchport trunk allowed vlan 100,200

 switchport mode trunk

 storm-control broadcast level 5.00

 channel-group 23 mode on

 My config on the DELL VLT peers is working so i won't put it, just the uplinks

#ConfigureUplinks_To_Core  on peer 1
interface port-channel 27

description ToCore1

switchport mode trunk
switchport trunk allowed vlan 100,200

vlt-port-channel 27

no shutdown

interface ethernet1/1/27
description ToCore1 cisco LACP


channel-group 27 mode active


no shutdown

 #ConfigureUplinks_To_Core  on peer 2

 

interface port-channel 27

description ToCore2

switchport mode trunk
switchport trunk allowed vlan 100,200

vlt-port-channel 27

no shutdown

interface ethernet1/1/27
description ToCore1 cisco LACP


channel-group 27 mode active


no shutdown

My questions :

- is my config ok?

- If so, Can it be that i don't declare "channel-protocol lacp" on the cisco side and so they can't communicate on the port-channel?

 

Thank you for your help

 

 

 

 

2 Accepted Solutions

Accepted Solutions

Reza Sharifi
Hall of Fame
Hall of Fame

Hi,

Mode "on" is static. So, try configuring LACP on the Cisco side as well and test.

To make things simpler, you can use the same PO number on both Cisco and Dell.

HTH

 

 

View solution in original post

Hello
The DELL and VSS have mismatching port channels so the connection will not come up.
Dell  = LACP
VSS = static PC ( no LACP negotiation) <---change this to be LACP



Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

View solution in original post

4 Replies 4

marce1000
VIP
VIP

 

                            >...but i can't ping the DELL switch.
 - A better test might be to try to ping a host on the dell switch over a common vlan (subnet). Also when the port channel is configured and connected check the logs on the 4500 and the Dell equipment too.

 M.



-- ' 'Good body every evening' ' this sentence was once spotted on a logo at the entrance of a Weight Watchers Club !

Reza Sharifi
Hall of Fame
Hall of Fame

Hi,

Mode "on" is static. So, try configuring LACP on the Cisco side as well and test.

To make things simpler, you can use the same PO number on both Cisco and Dell.

HTH

 

 

Hello
The DELL and VSS have mismatching port channels so the connection will not come up.
Dell  = LACP
VSS = static PC ( no LACP negotiation) <---change this to be LACP



Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

darant
Level 1
Level 1

Hello and thank you for your help, they were effectively not talking the same language

had to change to active mode on the DELL side instead of "ON" :

interface port-channel27
description ToCore1
no shutdown
switchport mode trunk
switchport trunk allowed vlan 18,23,52,64,444
vlt-port-channel 27

 

interface ethernet1/1/27
description ToCore1_LACP_Cisco
no shutdown
channel-group 27 mode active
no switchport
flowcontrol receive off

 

and on the CISCO side I put also mode active to switch to LACP

 

interface TenGigabitEthernet1/1/23
description *** VERS GREEN-ER-SWD147-1 ***
switchport trunk allowed vlan 18,23,48-64,444,854
switchport mode trunk
storm-control broadcast level 5.00
channel-group 23 mode active

And it's working great !

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