Posted on March 12, 2015 2:24 pm
 |  Asked by Peter
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I am configuring a pair of new Arista 7050T switches in MLAG.  My question relates to port configurations for the ports that will connect to the 6 x ESX hosts.  Each host has 2 dual port NICS and 2 vDS (1 for VM and 1 for IPStorage). Each vDS has a single uplink to each NIC(2 in total) and each NIC is connected to both switches.

1. When using vmtracer is the only config I need on the port “vmtracer vmware-esx” and this implements best practices regarding spanning-tree, switchport mode, flow control etc on each port or is this command simply a dynamic replacement for “switchport trunk allowed vlan 10,20,30, 40,…”



Posted by Andrei Dvornic
Answered on March 12, 2015 3:48 pm

vmtracer vmware-esx simply enables interfaces to send discovery packets to the connected vSwitch.

It will also allow the dynamic assignment and pruning of VLANs when a VM attached to the ESX connected to the switch is created, deleted, or moved to a different ESX host, unless autovlan disable is configured.

Posted by Andrei Dvornic
Answered on March 12, 2015 3:50 pm

See Chapter39 in the EOS User Manual for more details and examples.

Answered on March 13, 2015 8:58 pm

Hi Peter,

In addition to ’vmtracer vmware-esx’, you would also need the following commands to allow for dynamic assignment and pruning of VLANs on the trunk:

switchport mode trunk
switchport trunk allowed vlan none


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