neutron

provider network vlan tag numbers

Asked by sudhakar

I am using devstack single node installation with quantum enabled for my openstack learning and quantum plugin development. When I create provider vlan networks with particular segment number and some ports on them, I observed tag numbers on br-int are not same as my network segment numbers. Am I missing something here or my configuration for provider networks is wrong?
My localrc:

disable_service n-net
enable_service q-svc
enable_service q-agt
enable_service q-dhcp
enable_service q-l3
enable_service q-meta
enable_service quantum

ENABLE_TENANT_VLANS=True
TENANT_VLAN_RANGE=1:1999
PHYSICAL_NETWORK=default
OVS_PHYSICAL_BRIDGE=br-Test

mysql> select * from ovs_network_bindings;
+--------------------------------------+--------------+------------------+-----------------+
| network_id | network_type | physical_network | segmentation_id |
+--------------------------------------+--------------+------------------+-----------------+
| 9414d425-0bba-4d01-92da-11a725143cea | vlan | default | 2 |
| d14e28b5-715c-42c3-b8f0-ba53538c05f3 | vlan | default | 50 |
| d8852047-435e-485e-8bd6-c82d487d0992 | vlan | default | 1 |
+--------------------------------------+--------------+------------------+-----------------+

root@ubuntu:/opt/stack/devstack# ovs-vsctl show
3a7b5c2c-539b-4325-99a3-32cea4acf646
    Bridge br-Test
        Port br-Test
            Interface br-Test
                type: internal
        Port phy-br-Test
            Interface phy-br-Test
    Bridge br-ex
        Port br-ex
            Interface br-ex
                type: internal
        Port "qg-06a68938-de"
            Interface "qg-06a68938-de"
                type: internal
    Bridge br-int
        Port "tap72d47fb2-fa"
            tag: 2
            Interface "tap72d47fb2-fa"
                type: internal
        Port br-int
            Interface br-int
                type: internal
        Port "qvo1caa86ef-9a"
            tag: 3
            Interface "qvo1caa86ef-9a"
        Port "tapd73218b5-d2"
            tag: 1
            Interface "tapd73218b5-d2"
                type: internal
        Port int-br-Test
            Interface int-br-Test
        Port "qvo87646ffd-1a"
            tag: 2
            Interface "qvo87646ffd-1a"
        Port "qr-777e5d43-f8"
            tag: 1
            Interface "qr-777e5d43-f8"
                type: internal
    ovs_version: "1.4.3"

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Solved by:
dan wendlandt
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Best dan wendlandt (danwent) said : 		#1

no, this is expected behavior. the VLAN that exists on br-int will be mapped to the correct vlan when the packet is sent out a particular external bridge. This is done for two reasons:

1) its possible that the same vlan ID is being used on two different bridges
2) vlans are used within br-int even when tunneling is used for communcation between hosts.

Revision history for this message
sudhakar (sudhakaroq) said : 		#2

Thanks dan wendlandt, that solved my question.