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SQL Cluster failover or Internal Load Balancers problems, packet dropped or loss in a Dell EMC VxRack Azure Stack, MTU Size on TOR

After a fresh deployment of an Azure Stack, you probably want to deploy Resource Provider like App Services with SQL Failover Cluster or Internal Load Balancers, if you encounter problems after that please read this.

If the Azs deployment prior version 1905, please check this bellow:

Warning: Please log a SR Ticket with Dell EMC Support to help if you want.

Issue: MTU problems on Internal Load Balancers on Dell EMC Azure stack

In deployments prior to 1905, the VLAN 7 MTU setting defaults to 1500 MTU, however in instances where you are using Internal Load Balancers it is expected that the packet can exceed 1500 bytes for our VXLAN encapsulation headers. In these scenarios where the packet may have exceeded 1500 bytes and Don’t Fragment is set, the packet will be dropped.

To check the current TOR 1&2 configuration setting, run: show running-config interface vlan 7 on each switch

To adjust the VLAN 7 MTU setting, you will need to run the following commands to update VLAN 7 MTU for both TOR devices.

config

interface vlan 7

mtu 9216

copy run start

Et voilà

About Frederic Stefani

Frederic Stefani works as a Solutions Architect at Dell EMC. Frederic is focused on Microsoft Technologies, especially Microsoft Cloud Solutions based on Microsoft System Center, Microsoft Virtualization and Microsoft Azure. This includes Microsoft Hyper-V, Windows Server, Storage, Networking and Azure Pack as well as Service Management Automation. Frederic works closely with Customers and Microsoft to promote Microsoft Technology as speaker for Dell EMC, Microsoft and other Technical events such as Microsoft Experiences or Dell events. Frederic also works ahead of sales with our customers to promote Dell EMC services Specialities: Cloud, Datacenter, Microsoft Azure, Microsoft Azure Stack, Windows Server, Hyper-V, Windows Clients, Disaster Recovery, Powershell, Windows Deployment Services, Windows Unattended Installations, Microsoft Hosting Solutions, Powershell Development, SCVMM, System Center, Datacenter Management, Storage, Networking, Software Defined Datacenter. P-Seller (Partner Seller) within the competences: Core Infrastructure and Azure for Microsoft France

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