[ovs-discuss] Two GRE tunnels with same src/dst
jesse at nicira.com
Tue Jan 4 22:34:42 UTC 2011
On Thu, Dec 30, 2010 at 6:00 PM, Frank <frank at cloud.com> wrote:
> Hi guys:
> I just try to create two GRE tunnels between two hosts, the result is I
> can't do this.
> vswitch complains "could not create iface test: File exists" when
> creating second tunnel.
> I did set different GRE keys for tunnels.
> I google and get some articles said it's possible to create multiple GRE
> tunnels with same src/dst.
> I am curious what technical barrier prevents our doing since GRE key is
> an natural tag to distinguish different tunnels.
You can have multiple tunnels between the same endpoints if they are
distinguished by key. Please post your interface config.
> BTW: when the interface created failed, ovs-vsctl also returns a uuid as
> if it succeeds. This is very puzzle, the real result in log is:
> Dec 30 14:40:06|04201|bridge|INFO|created port test on bridge test
> Dec 30 14:40:06|04202|bridge|WARN|could not create iface test: File exists
> Dec 30 14:40:06|04203|bridge|WARN|bridge test: port test has no interfaces,
> cloud we have more graceful way to report such failure?
It's not as straightforward as it might seem while maintaining good
abstraction. ovs-vsctl writes into the database, which only enforces
some basic constraints. ovs-vswitchd then picks up the config, does
the actual port creation, and generates those log messages.
Patches are, of course, welcome.
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