Open Stack

Hi,

I have four compute nodes in my lab setup. Initially all the four compute
nodes were acting as gateway chassis with priority 1, 2, 3 and 4.

Then I have specifically marked two node as a gateway chassis with below
command on compute nodes.

ovs-vsctl set open . external-ids:ovn-cms-options="enable-chassis-as-gw"

The command ovn-nbctl list gateway_chassis start showing two chassis. I
have checked via tcpdump, the public traffic started flowing from both
nodes. Look like its doing round robin to send packets.

Then I tried to remove one chassis from gateway and used below command.

ovs-vsctl remove open . external-ids ovn-cms-options=enable-chassis-as-gw

The  ovn-nbctl list gateway_chassis started showing one gateway chassis but
I can see from tcpdump that public traffic still flows from both gateway
chassis.

Below is the current status of chassis.

root at network:/etc/neutron# ovn-sbctl list chassis
_uuid               : 532bb9d0-6667-462c-9631-0cb5360bd4dc
encaps              : [358c4a59-0bca-459c-958c-524eb8c385ce]
external_ids        : {datapath-type=system,
iface-types="erspan,geneve,gre,internal,ip6erspan,ip6gre,lisp,patch,stt,system,tap,vxlan",
is-interconn="false",
"neutron:liveness_check_at"="2021-03-16T08:52:41.361302+00:00",
"neutron:metadata_liveness_check_at"="2021-03-16T08:52:41.364928+00:00",
"neutron:ovn-metadata-id"="2ac66785-d0c7-43ee-8c78-5fd6ed6ccc73",
"neutron:ovn-metadata-sb-cfg"="6157",
ovn-bridge-mappings="ext-net1:br-ext", ovn-chassis-mac-mappings="",
ovn-cms-options=""}
hostname            : virtual-hv2
name                : "fdfae005-7473-486a-b331-8a54c53c1279"
nb_cfg              : 6157
transport_zones     : []
vtep_logical_switches: []

_uuid               : a99ab389-96a5-4a58-a301-34618868450a
encaps              : [6e7490ce-3c58-4a1c-999d-ff1638c66feb]
external_ids        : {datapath-type=system,
iface-types="erspan,geneve,gre,internal,ip6erspan,ip6gre,lisp,patch,stt,system,tap,vxlan",
is-interconn="false",
neutron-metadata-proxy-networks="dc917847-f70f-4de0-9865-3e9594c65ef1",
"neutron:liveness_check_at"="2021-03-16T08:52:41.368768+00:00",
"neutron:metadata_liveness_check_at"="2021-03-16T08:52:41.372045+00:00",
"neutron:ovn-metadata-id"="3441fc3c-ca43-4360-8210-8c9ebe4fc13d",
"neutron:ovn-metadata-sb-cfg"="6157",
ovn-bridge-mappings="ext-net1:br-ext", ovn-chassis-mac-mappings="",
ovn-cms-options=""}
hostname            : kvm10-a1-khi01
name                : "87504098-4474-40fc-9576-ac449c1c4448"
nb_cfg              : 6157
transport_zones     : []
vtep_logical_switches: []

_uuid               : b9bdfe12-fe27-4580-baee-159f871c442b
encaps              : [52a8f523-9740-4333-a4a4-69bf5e27117c]
external_ids        : {datapath-type=system,
iface-types="erspan,geneve,gre,internal,ip6erspan,ip6gre,lisp,patch,stt,system,tap,vxlan",
is-interconn="false",
neutron-metadata-proxy-networks="dc917847-f70f-4de0-9865-3e9594c65ef1",
"neutron:liveness_check_at"="2021-03-16T08:52:41.326719+00:00",
"neutron:metadata_liveness_check_at"="2021-03-16T08:52:41.342214+00:00",
"neutron:ovn-metadata-id"="2a751610-97a8-4688-a719-df3616f4f770",
"neutron:ovn-metadata-sb-cfg"="6157",
ovn-bridge-mappings="ext-net1:br-ext", ovn-chassis-mac-mappings="",
ovn-cms-options=""}
hostname            : kvm12-a1-khi01
name                : "82630e57-668e-4f67-a3fb-a173f4da432a"
nb_cfg              : 6157
transport_zones     : []
vtep_logical_switches: []

_uuid               : 669d1ae3-7a5d-4ec3-869d-ca6240f9ae2c
encaps              : [ac8022b3-1ea5-45c7-a7e8-74db7b627df4]
external_ids        : {datapath-type=system,
iface-types="erspan,geneve,gre,internal,ip6erspan,ip6gre,lisp,patch,stt,system,tap,vxlan",
is-interconn="false",
"neutron:liveness_check_at"="2021-03-16T08:52:41.347144+00:00",
"neutron:metadata_liveness_check_at"="2021-03-16T08:52:41.352021+00:00",
"neutron:ovn-metadata-id"="2d5ce6fd-6a9f-4356-9406-6ca91601af43",
"neutron:ovn-metadata-sb-cfg"="6157",
ovn-bridge-mappings="ext-net1:br-ext", ovn-chassis-mac-mappings="",
ovn-cms-options=enable-chassis-as-gw}
hostname            : virtual-hv1
name                : "731e842a-3a69-4044-87e9-32b7517d4f07"
nb_cfg              : 6157
transport_zones     : []
vtep_logical_switches: []

Need help how can I permanently remove a gateway chassis that it should
stop serving public traffic ? also is it something to do with priority ?

- Ammad
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