Bug 1445502

Summary:	On a single-node cluster, multicast is never correctly set up.
Product:	OpenShift Container Platform	Reporter:	Ben Bennett <bbennett>
Component:	Networking	Assignee:	Ben Bennett <bbennett>
Status:	CLOSED ERRATA	QA Contact:	Meng Bo <bmeng>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	3.5.0	CC:	aos-bugs, bmeng, hongli, smunilla
Target Milestone:	---
Target Release:	3.5.z
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	Cause: The code to set up multicast was not run when only one node was in the cluster. Consequence: Multicast traffic was dropped when on a single-node cluster. Fix: Change the rules so the multicast setup is performed for a single-node. Result: Multicast works for single-node clusters.	Story Points:	---
Clone Of:	1445501	Environment:
Last Closed:	2017-05-18 09:28:50 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1445501
Bug Blocks:

Description Ben Bennett 2017-04-25 19:58:32 UTC

+++ This bug was initially created as a clone of Bug #1445501 +++

Description of problem:

On a single-node cluster, multicast packets are not delivered.


Version-Release number of selected component (if applicable):

3.5.0

How reproducible:

Always

Steps to Reproduce:
1. Create a single node cluster
2. Create a pod to receive multicast packets
3. Create a pod to send multicast packets
4. Watch for multicast delivery

Actual results:

At step 4, no packets are delivered.

Expected results:

At step 4, packets should be delivered.

Additional info:

Comment 2 Hongan Li 2017-04-28 07:33:20 UTC

verified in atomic-openshift-3.5.5.10-1.git.0.9290eec.el7.x86_64 and the bug has been fixed. Multicast works well on single node cluster.



# ovs-ofctl dump-flows br0 -O openflow13 | grep table=111
 cookie=0x0, duration=7463.021s, table=111, n_packets=78, n_bytes=7062, priority=100 actions=goto_table:120

Comment 4 errata-xmlrpc 2017-05-18 09:28:50 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:1235