[ovs-discuss] GRE tunnel not working when interface name lenght > 13 characters

Justin Pettit jpettit at nicira.com
Wed Feb 15 18:02:06 UTC 2012

On Feb 15, 2012, at 9:56 AM, Jesse Gross wrote:

> On Wed, Feb 15, 2012 at 9:52 AM, Salvatore Orlando
> <Salvatore.Orlando at eu.citrix.com> wrote:
>> Hi Jesse,
>> I apologise I did not configure correctly the vswitch on the Ubuntu machine running 1.2.
>> The behaviour seems anyway confirmed in 1.0.99, but I suspect that's unsupported now.
>> Anyway, is the behaviour when the interface name exceeds the 16 character limit documented?
>> Ovs-vsctl did not raise any error message.
> It's a standard limit of network devices in Linux.

Also, the description of the "name" column in the Interface table recommends keeping the length to around 8 bytes:

	name: string (must be unique within table) Interface name. Should be 
	alphanumeric and no more than about 8 bytes long. May be the same 
	as the port name, for non-bonded ports. Must otherwise be unique 
	among the names of ports, interfaces, and bridges on a host. 

Although we're probably not entirely successful, we try not to put too much Linux-specific information in the ovs-vswitchd.conf.db man page, since OVS is ported to other systems.


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