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Bug 1757715

Summary: [RFE][OVN] [RHEL 7] Static IP multicast flood configuration
Product: Red Hat Enterprise Linux Fast Datapath Reporter: Dumitru Ceara <dceara>
Component: ovn2.11Assignee: Dumitru Ceara <dceara>
Status: CLOSED ERRATA QA Contact: Jianlin Shi <jishi>
Severity: medium Docs Contact:
Priority: unspecified    
Version: FDP 19.GCC: ctrautma, fleitner, jishi, liali, mmichels, nusiddiq, qding
Target Milestone: ---Keywords: FutureFeature
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: ovn2.11-2.11.1-7.el7fdp ovn2.11-2.11.1-7.el8fdp ovn2.12-2.12.0-1.el7fdp ovn2.12-2.12.0-1.el8fdp Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of:
: 1761376 (view as bug list) Environment:
Last Closed: 2019-11-06 05:00:08 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:    
Bug Blocks: 1761376    

Description Dumitru Ceara 2019-10-02 09:11:22 UTC 
Description of problem:
ovn2.11-2.11.1-2 supports IGMP and BZ 1757714 will add support for IGMP Relay. In order to allow IP multicast connectivity to the outside of an OVN (e.g., to a PIM router) we need logical switch/router configuration options to enable flooding of IP multicast traffic and/or reports on given logical ports.
Comment 3 Jianlin Shi 2019-10-17 03:46:59 UTC 
Verified on ovn2.11.1-8 following steps in https://bugzilla.redhat.com/show_bug.cgi?id=1761376#c3:

==Test for mcast_flood and mcast_flood_reports on logical switch:

enable mcast_snoop on ls2:
[root@ibm-x3650m5-03 bz1757714]# ovn-nbctl set Logical_Switch ls2 other_config:mcast_querier=false other_config:mcast_snoop=true

ping multicast on server0 and dump packet on server1:
[root@ibm-x3650m4-01 bz1757714]# ip netns exec server0 ping 224.1.1.1 -c 1 -t 64
PING 224.1.1.1 (224.1.1.1) 56(84) bytes of data.                                                      

--- 224.1.1.1 ping statistics ---                                                                     
1 packets transmitted, 0 received, 100% packet loss, time 0ms
[root@ibm-x3650m4-01 ~]# ip netns exec server1 tcpdump -i any -nnle                                   
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on any, link-type LINUX_SLL (Linux cooked), capture size 262144 bytes                       
^C                                                                                                    
0 packets captured                                                                                    
0 packets received by filter                                                                          
0 packets dropped by kernel

<==== multicast not received

set mcast_flood as true on port connected to server1:
[root@ibm-x3650m5-03 bz1757714]# ovn-nbctl set Logical_Switch_Port ls2p2 options:mcast_flood=true 

[root@ibm-x3650m4-01 ~]# ip netns exec server1 tcpdump -i any -nnle                                   
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode                            
listening on any, link-type LINUX_SLL (Linux cooked), capture size 262144 bytes                       
23:36:42.492458   M 1a:bc:b4:2c:c8:65 ethertype IPv4 (0x0800), length 100: 1.1.2.2 > 224.1.1.1: ICMP echo request, id 13120, seq 1, length 64
^[^C                                                                                                  
1 packet captured                                                                                     
1 packet received by filter                                                                           
0 packets dropped by kernel

<=== multicast received

join multicast group on server0 and dump packet on server1:
[root@ibm-x3650m4-01 bz1757714]# ip netns exec server0 join_group -f 4 -g 224.1.1.1 -i veth0_s0 &     
[1] 13126                                                                                             
[root@ibm-x3650m4-01 bz1757714]# ip netns exec server0 ip maddr                                       
1:      lo                                                                                            
        inet  224.0.0.1                                                                               
        inet6 ff02::1                                                                                 
        inet6 ff01::1                                                                                 
17:     veth0_s0                                                                                      
        link  33:33:00:00:00:01                                                                       
        link  01:00:5e:00:00:01                                                                       
        link  33:33:ff:2c:c8:65                                                                       
        link  01:00:5e:01:01:01                                                                       
        inet  224.1.1.1                                                                               
        inet  224.0.0.1
        inet6 ff02::1:ff2c:c865
        inet6 ff02::1
        inet6 ff01::1

[root@ibm-x3650m4-01 ~]# ip netns exec server1 tcpdump -i any -nnle
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode                            
listening on any, link-type LINUX_SLL (Linux cooked), capture size 262144 bytes
^C
0 packets captured                                                                                    
0 packets received by filter                                                                          
0 packets dropped by kernel

<=== no multicast report received

enable mcast_flood_reports:
[root@ibm-x3650m5-03 bz1757714]# ovn-nbctl set Logical_Switch_Port ls2p2 options:mcast_flood_reports=true

[root@ibm-x3650m4-01 ~]# ip netns exec server1 tcpdump -i any -nnle
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode                            
listening on any, link-type LINUX_SLL (Linux cooked), capture size 262144 bytes                       
23:42:12.582491   M 1a:bc:b4:2c:c8:65 ethertype IPv4 (0x0800), length 56: 1.1.2.2 > 224.0.0.22: igmp v3 report, 1 group record(s)
23:42:13.377413   M 1a:bc:b4:2c:c8:65 ethertype IPv4 (0x0800), length 56: 1.1.2.2 > 224.0.0.22: igmp v3 report, 1 group record(s)
^C                                                                                                    
2 packets captured                                                                                    
2 packets received by filter                                                                          
0 packets dropped by kernel

<==== multicast report received

==Test for mcast_flood on logical router:

disable mcast_snoop on ls1 and ls2:
[root@ibm-x3650m5-03 bz1757714]# ovn-nbctl set Logical_Switch ls2 other_config:mcast_querier="false" other_config:mcast_snoop="false"
[root@ibm-x3650m5-03 bz1757714]# ovn-nbctl set Logical_Switch ls1 other_config:mcast_querier="false" other_config:mcast_snoop="false"

enable igmp_relay on lr1:
[root@ibm-x3650m5-03 bz1757714]# ovn-nbctl set logical_router lr1 options:mcast_relay="true"

send multicast on server0 and dump packet on client0:
[root@ibm-x3650m4-01 bz1757714]# ip netns exec server0 ping 224.1.1.1 -c 1 -t 64                      
PING 224.1.1.1 (224.1.1.1) 56(84) bytes of data.

--- 224.1.1.1 ping statistics ---                                                                     
1 packets transmitted, 0 received, 100% packet loss, time 0ms
[root@ibm-x3650m5-03 ~]# ip netns exec client0 tcpdump -i any -nnle                                   
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on any, link-type LINUX_SLL (Linux cooked), capture size 262144 bytes                       
^C
0 packets captured
0 packets received by filter                                                                          
0 packets dropped by kernel

<=== no multicast received

enable mcast_flood on ls1 port connected to router:

[root@ibm-x3650m5-03 bz1757714]# ovn-nbctl set Logical_Router_Port lr1-s1 options:mcast_flood=true 

[root@ibm-x3650m5-03 ~]# ip netns exec client0 tcpdump -i any -nnle
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on any, link-type LINUX_SLL (Linux cooked), capture size 262144 bytes                       
23:46:11.344679   M 00:de:ad:ff:01:01 ethertype IPv4 (0x0800), length 100: 1.1.2.2 > 224.1.1.1: ICMP echo request, id 13141, seq 1, length 64
^C
1 packet captured
1 packet received by filter
0 packets dropped by kernel

<==== multicast received

set VERIFIED
Comment 5 errata-xmlrpc 2019-11-06 05:00:08 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-2019:3718