[ovs-dev] Question about gretap0 and erspan0 and ip6tnl0 creation

Jin, Liang liangjin at ebay.com
Thu Oct 4 20:13:51 UTC 2018


Because we don't use that module, just curious, they were not found before, is it possible to disable gre and ipv6 module, if we don't want to use it.

Thanks
L.J.

On 10/4/18, 1:09 PM, "Gregory Rose" <gvrose8192 at gmail.com> wrote:

    On 10/4/2018 11:16 AM, Jin, Liang via dev wrote:
    > Hi ovs-dev,
    > After we upgrade ovs 2.10, we found some interface created, why they are created even in bridge scenario?   is it possible not to create them when upgrading?  Is this a bug in ovs 2.10?
    >
    > 24: gretap0 at NONE: <BROADCAST,MULTICAST> mtu 1462 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    >      link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
    > 25: erspan0 at NONE: <BROADCAST,MULTICAST> mtu 1446 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    >      link/ether 12:0e:f1:ea:1d:e0 brd ff:ff:ff:ff:ff:ff
    > 26: gre0 at NONE: <NOARP> mtu 1476 qdisc noop state DOWN mode DEFAULT group default qlen 1
    >      link/gre 0.0.0.0 brd 0.0.0.0
    > 27: ip6gre0 at NONE: <NOARP> mtu 1448 qdisc noop state DOWN mode DEFAULT group default qlen 1
    >      link/gre6 00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00 brd 00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00
    > 28: ip6tnl0 at NONE: <NOARP> mtu 1452 qdisc noop state DOWN mode DEFAULT group default qlen 1
    > link/tunnel6 :: brd ::
    
    This is not a bug - it is intended operation.   They're required as the 
    FB devices for the newly added ipv6 gre tunneling and  ipv4/ipv6 ERSPAN 
    features.
    
    Why do you not want them created?
    
    - Greg
    
    >
    >
    > Thanks
    > L.J.
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