[OPNFLWPLUG-528] [GROUP RECONCILIATION]Groups pointing to ports donot reconcile if ports come up late

Mon, 27 Sep 2021 09:01:37 +0000

Description:

In most case we havea broadcast flow whose actions were set to broadcast group ID.
So the configuration would be a flow --> group --> List

{port}

(as different actions)

The group configuration is given below:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<group xmlns="urn:opendaylight:flow:inventory">
<group-type>group-ff</group-type>
<buckets>
<bucket>
<action>
<output-action>
<output-node-connector>openflow:1:1</output-node-connector>
</output-action>
<order>2</order>
</action>
<action>
<output-action>
<output-node-connector>openflow:1:4</output-node-connector>
</output-action>
<order>0</order>
</action>
<action>
<output-action>
<output-node-connector>openflow:1:3</output-node-connector>
</output-action>
<order>1</order>
</action>
<action>
<output-action>
<output-node-connector>openflow:1:5</output-node-connector>
</output-action>
<order>6</order>
</action>
<action>
<output-action>
<output-node-connector>openflow:1:6</output-node-connector>
</output-action>
<order>7</order>
</action>

<bucket-id>1</bucket-id>
<watch_port>2</watch_port>
</bucket>
</buckets>
<barrier>false</barrier>
<group-name>Foo7</group-name>
<group-id>7</group-id>
</group>

Now if when my switch connects with just 1 port, the group mod fails as OFPBAC_BAD_OUT_PORT, but a little later all my ports come up, but the group doesnot reconcile ever.

Hence this can lead to traffic loss in heavy traffic scenario. Hence marking it as critical

OpenDaylight JIRA

[OPNFLWPLUG-528] [GROUP RECONCILIATION]Groups pointing to ports donot reconcile if ports come up late