Open Stack

GRE and VXLAN packet use 24bit id range. Max number of ID is 1,677,000

and per host max number of subnet is 4094 that is inner VLAN limitation.

 

Hiroki Aramaki

 

From: Robert Kukura [mailto:kukura at noironetworks.com] 
Sent: Tuesday, April 01, 2014 11:17 AM
To: openstack at lists.openstack.org
Subject: Re: [Openstack] Limit of tunnel_id_ranges in Neutron

 

 

On 3/31/14, 1:31 PM, Changbin Liu wrote:

I notice that there are flow_mod flows on OVS which handle 1-to-1
translations between VLAN IDs and GRE/VXLAN tunnel IDs. Does it mean the
range of tunnel_ids is limited by VLAN tags?

These local VLAN IDs on br-int are assigned separately on each compute or
network node by neutron's openvswitch-agent, so you should be able to use
any number of networks simultaneously in your deployment as long as no more
than 4094 networks are active at once on any one node.

-Bob






 

Thanks

 

Changbin

 

On Sun, Mar 30, 2014 at 5:31 PM, Kyle Mestery <mestery at noironetworks.com>
wrote:

On Fri, Mar 28, 2014 at 11:39 PM, Changbin Liu <changbin.liu at gmail.com>
wrote:

Hi All,  

 

Maybe this is a simple question: is there any limit on "tunnel_id_ranges" in
Neutron configuration? Say, can I configured it to e.g., "1:10000" if I have
10000 tenants in the cloud. I know VLAN is limited to 4094 tags.

 

I googled around this issue but found that most commonly it  is configured
to default "1:1000".

 

There should not be a limit here, although the code will verify the tunnel
ID falls within an allowed range for your tunnel protocol (currently GRE or
VXLAN).

 

Thanks,

Kyle

 

Thanks

 

Changbin


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