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@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@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@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@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@NONE: <NOARP> mtu 1452 qdisc noop state DOWN mode DEFAULT group 
default qlen 1
link/tunnel6 :: brd ::


Thanks
L.J.
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