[ovs-discuss] Two GRE tunnels with same src/dst

[Frank]

Thanks Romain. That's a typo, with type "gre" it will be still failed. 
And the log complains "File exists"

[root at xenserver-frank1 ~]# ovs create interface name=test 
options:"remote_ip=192.168.152.22 key=2" type=gre
e0f8369c-bd5c-41b9-8e22-8d6b58e11429

[root at xenserver-frank1 ~]# ovs create port name=test 
interfaces=[e0f8369c-bd5c-41b9-8e22-8d6b58e11429]
13abaf54-155c-4954-951f-4e7da1f48b8e

[root at xenserver-frank1 ~]# ovs add bridge xapi7 ports 
13abaf54-155c-4954-951f-4e7da1f48b8e

The log says:

Jan 18 10:57:23|11332|bridge|INFO|created port test on bridge xapi7
Jan 18 10:57:23|11333|bridge|WARN|could not create iface test: File exists
Jan 18 10:57:23|11334|bridge|WARN|bridge xapi7: port test has no 
interfaces, dropping



On 01/16/2011 04:25 PM, Romain Lenglet wrote:
> Hi Frank,
>
> You don't create the GRE ports correctly.
> The options and type are incorrect. See below.
>
> On Fri, Jan 14, 2011 at 7:22 AM, Frank <frank at cloud.com 
> <mailto:frank at cloud.com>> wrote:
>
>     On 01/04/2011 02:34 PM, Jesse Gross wrote:
>
>         On Thu, Dec 30, 2010 at 6:00 PM, Frank<frank at cloud.com
>         <mailto: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.
>
>
>     I am sorry for late reply. I create tunnels as below (ovs is alias
>     of ovs-vsctl):
>
>     [root at xenserver-frank4 ~]# ovs list interface 1-2
>     _uuid               : ebc0d114-d258-4670-9965-8a5a0491b0b9
>     external_ids        : {}
>     ingress_policing_burst: 0
>     ingress_policing_rate: 0
>     mac                 : []
>     name                : "1-2"
>     ofport              : 8
>     options             : {remote_ip="192.168.152.22 key=1"}
>
>
> Those options should read {remote_ip="192.168.152.22", key="1"}.
>
>     statistics          : {collisions=0, rx_bytes=894703,
>     rx_crc_err=0, rx_dropped=0, rx_errors=0, rx_frame_err=0,
>     rx_over_err=0, rx_packets=12083, tx_bytes=28882506, tx_dropped=0,
>     tx_errors=0, tx_packets=21760}
>     status              : {}
>     type                : gre
>     [root at xenserver-frank4 ~]# ovs create interface name=test
>     options:"remote_ip=192.168.152.22 key=2"
>
>
> So I suggest trying something like:
> ovs create interface name=test 'options:remote_ip="192.168.152.22", 
> key="2"'
> to create the interface with correct options.
>
>     74c1e2e3-da43-4ae4-86e7-048de205f974
>
>     [root at xenserver-frank4 ~]# ovs create port name=test
>     interfaces=[74c1e2e3-da43-4ae4-86e7-048de205f974]
>     3dc08a5c-102c-45c6-9891-9692d2d4a8e3
>
>     [root at xenserver-frank4 ~]# ovs add bridge xapi7 ports
>     3dc08a5c-102c-45c6-9891-9692d2d4a8e3
>
>     [root at xenserver-frank4 ~]# ovs list interface test
>     _uuid               : 74c1e2e3-da43-4ae4-86e7-048de205f974
>     external_ids        : {}
>     ingress_policing_burst: 0
>     ingress_policing_rate: 0
>     mac                 : []
>     name                : test
>     ofport              : []
>     options             : {remote_ip="192.168.152.22 key=2"}
>     statistics          : {}
>     status              : {}
>     type                : ""
>
>
> This type is wrong. It should be "gre" for a GRE port.
> You have to pass the correct type when creating the interface above.
>
>
>
>     Actually I already had a tunnel to "192.168.152.22" with key = 1.
>     we can see the secondary creation was failed even I set the key=2.
>     In ovs-vswitchd.log, here are:
>
>     Jan 13 14:18:31|02259|netdev|WARN|failed to get flags for network
>     device test: No such device
>     Jan 13 14:18:31|02260|bridge|WARN|could not create iface test: No
>     such device
>     Jan 13 14:18:31|02261|bridge|WARN|bridge xapi7: port test has no
>     interfaces, dropping
>
>
>
>
>
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>
>

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