vBlock Tip: Increase Cisco 1000V Max Ports from default of 32


Another post in the vBlock tip series…

VCE use static binding on the Cisco 1000V and this combined with the default of 32 ports per VLAN means most people will soon run out of ports on their DV port groups.

Who knows why 32 is the default. It seems a bit conservative to me. Maybe there is a global port limit but I haven’t been able to confirm this.

Either way, 32 doesn’t seem nearly enough ports in most network designs. The good news is the maximum is 1024, so it makes sense to me to increase it substantially depending on the number of VLANs you have.

As soon as your vBlock lands I would definitely review each DV Port Group and increase the max ports assigned.

Static binding is a pain in the arse – it means that any VM whether a template or whether its powered off will use up a port if it is assigned to the DV Port Group. You may only have 5x running VMs on the VLAN but you won’t be able to add and power on a 6th VM if you have 27x VMs\templates powered off and assigned to that same DV Port Group.

For that reason alone I am not sure why VCE don’t just use ephemeral binding. Anyway I am going off topic.

Instructions from VMware KB1035819 on how to increase your max ports for each VLAN (port-profile).

These are the commands I use:

  1. show port-profile – to find the correct port profile name
  2. conf t – enter configuration
  3. port-profile <DV-port-group-name> – change configuration context to the correct port-profile
  4. vmware max-ports 64 – change max ports to 64
  5. copy run start – copy running config to startup config
  6. exit
  7. exit
  8. exit

 

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