Network Flapping and get connect and dis-connect regularly

Question

Hi, I have design Leaf and Spine with VLTi and VLT domain by using S4148FE-ON switches. Everything is working fine but ESXI hosts side and even end devices have packet loss and it is happening regularly. it gets connect and disconnect frequently. I used port channel to connect for ESXI host. Could you please any one help to fix this issue. Thanks in Advance.

DELL-Josh Cr · Answer

Hi, What version of the OS are you running? Are all of the devices directly connected or are there other switches involved? Is spanning-tree enabled? Are there any errors in the logs?

bkumar100 · Answer

Hi Josh, Thanks for your response. Switch S4148FE-ON with OS 10.3 is directly connected to the ESXI host as VLT domain. There is no switches between them, I enable the Spanning-tree rstp with priority 0 for S1 and 4096 for S2. Do I need to configured any other STP features to the ESXI conected port. No portfast has configured to these ports so could you please guide me. Thanks once again.

bkumar100 · Answer

The commands are below for Switch 1 and only priority is different for 2nd Switch:

spanning-tree mode rstp

spanning-tree rstp priority 0

!

interface range ethernet1/1/9-1/1/25

switchport mode trunk

switchport access vlan 1

no shutdown description "Connecting to EsxiHostConnection"

!

vlt-domain 90

backup destination 10.0.19.2

discovery-interface ethernet1/1/27-1/1/28

DELL-Josh Cr · Answer

You might want to try updating to 10.4.3. Are there any errors with show logging? Instead of show switchport access vlan 1, do switchport trunk allowed vlan 1. Page 197 https://downloads.dell.com/manuals/common/os10_enterprise-ug_en-us.pdf

Dennis_DFR · Answer

Spoiler You might want to try updating to 10.4.3. Are there any errors with show logging? Instead of show switchport access vlan 1, do switchport trunk allowed vlan 1. Page 197 https://downloads.dell.com/manuals/common/os10_enterprise-ug_en-us.pdf-mycfavisit You might want to try updating to 10.4.3. Are there any errors with show logging? Instead of show switchport access vlan 1, do switchport trunk allowed vlan 1. Page 197 https://downloads.dell.com/manuals/common/os10_enterprise-ug_en-us.pdf-mycfavisit Happy to help! Thanks for leaving a comment.

JesperAP · Answer

Sorry for the reply on an old topic. I have exactly the same issue, did you solve it? @bkumar100

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