01-11-2023 12:40 AM
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
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
- 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
Solved! Go to Solution.
01-11-2023 06:59 AM - edited 01-11-2023 08:37 AM
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
01-11-2023 12:40 PM
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
01-11-2023 02:23 AM
>...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.
01-11-2023 06:59 AM - edited 01-11-2023 08:37 AM
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
01-11-2023 12:40 PM
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
01-12-2023 06:10 AM
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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