Hi,

On Wed, May 25, 2022 at 8:21 AM tommy <sz_cuitao@163.com> wrote:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel master ovirtmgmt state UP group default qlen 1000
link/ether 08:00:27:94:4d:e8 brd ff:ff:ff:ff:ff:ff
3: ovs-system: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether 9e:5d:8f:94:00:86 brd ff:ff:ff:ff:ff:ff

This is an interface that is installed by openvswitch. AFAIK it shouldn't be used anymore and is there for historical reasons.

4: br-int: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000
link/ether ea:20:e5:c3:d6:31 brd ff:ff:ff:ff:ff:ff

This is OVNs integration bridge, it is used for all traffic that is defined through ovirt-provider-ovn.

5: ovirtmgmt: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether 08:00:27:94:4d:e8 brd ff:ff:ff:ff:ff:ff
inet 10.1.1.7/24 brd 10.1.1.255 scope global noprefixroute ovirtmgmt

Management bridge for oVirt. Depending on the network roles it might be the only network and that will

be passing all oVirt and host related traffic.

valid_lft forever preferred_lft forever
21: ip_vti0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000
link/ipip 0.0.0.0 brd 0.0.0.0

IPSec virtual interface. Created by libreswan.

22: ;vdsmdummy;: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether 1e:cb:bf:02:f7:33 brd ff:ff:ff:ff:ff:ff

Bridge created by oVirt, it is used for VMs that do not have any interface assigned.

what use of the 3/4/5/21/22 ? ( I know the item 5 )
are they all the bridge ?

Not all of them are bridges, and also brctl will show only linux bridges. For example

br-int is an OvS bridge.

The out put of the brctl show appears only the ovirtmgmt and ;vdsmdummy' are bridge.
[root@host1 ~]# brctl show
bridge name bridge id STP enabled interfaces
;vdsmdummy; 8000.000000000000 no
ovirtmgmt 8000.080027944de8 no enp0s3
[root@host1 ~]#

Let us know if you have any further questions.

Regards,

Ales

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Ales Musil

Senior Software Engineer - RHV Network

Red Hat EMEA

amusil@redhat.com IM: amusil