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Bug 1749739

Summary: [RHEL 7] GARP reply packets from switches are handled on all ovn-controllers
Product: Red Hat Enterprise Linux Fast Datapath Reporter: Numan Siddique <nusiddiq>
Component: ovn2.11Assignee: Numan Siddique <nusiddiq>
Status: CLOSED ERRATA QA Contact: haidong li <haili>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: FDP 19.GCC: ctrautma, jishi, kfida, mmichels, qding
Target Milestone: ---   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: ovn2.11-2.11.1-7 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of:
: 1761371 (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: 1761371    

Description Numan Siddique 2019-09-06 10:48:10 UTC 
Description of problem:
If all the chassis have external connectivity (ovn-bridge-mappings defined) and if the physical switch keeps sending periodic GARP replies (instead of Requests) they are handled by all chassis's.

It's enough if those GARPs are handled only on the gateway chassis where the distributed router port is scheduled.


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


How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info:
Comment 3 haidong li 2019-10-22 07:09:58 UTC 
verified on the latest version:
[root@dell-per740-18 ovn]# rpm -qa | grep openvswitch
openvswitch-selinux-extra-policy-1.0-14.el7fdp.noarch
openvswitch2.11-2.11.0-26.el7fdp.x86_64
kernel-kernel-networking-openvswitch-ovn_ha-1.0-41.noarch
[root@dell-per740-18 ovn]# rpm -qa | grep ovn
ovn2.11-2.11.1-8.el7fdp.x86_64
ovn2.11-central-2.11.1-8.el7fdp.x86_64
ovn2.11-host-2.11.1-8.el7fdp.x86_64
kernel-kernel-networking-openvswitch-ovn_ha-1.0-41.noarch
[root@dell-per740-18 ovn]#
root@dell-per740-18 ovn]# ovn-nbctl show
switch 086e87ca-1eee-4440-9790-6f0d7859360d (s3)
    port hv0_vm00_vnet1
        addresses: ["00:de:ad:00:00:01 172.16.103.11"]
    port hv0_vm01_vnet1
        addresses: ["00:de:ad:00:01:01 172.16.103.12"]
    port s3_r1
        type: router
        addresses: ["00:de:ad:ff:01:03 172.16.103.1"]
        router-port: r1_s3
switch ecc8b593-19fe-4509-8590-a68edcd2185d (public)
    port ln_p1
        type: localnet
        addresses: ["unknown"]
    port public_r1
        type: router
        router-port: r1_public
switch 3827320f-2e1f-4ad2-9394-cfef23e086dc (s2)
    port s2_r1
        type: router
        addresses: ["00:de:ad:ff:01:02 172.16.102.1"]
        router-port: r1_s2
    port hv1_vm01_vnet1
        addresses: ["00:de:ad:01:01:01 172.16.102.12"]
    port hv1_vm00_vnet1
        addresses: ["00:de:ad:01:00:01 172.16.102.11"]
router 5b2f265f-abdd-4f82-b57f-a45ed441f52d (r1)
    port r1_s3
        mac: "00:de:ad:ff:01:03"
        networks: ["172.16.103.1/24"]
    port r1_public
        mac: "40:44:00:00:00:03"
        networks: ["172.16.104.1/24"]
    port r1_s2
        mac: "00:de:ad:ff:01:02"
        networks: ["172.16.102.1/24"]
    nat 599e4d31-0fba-4af3-8dc5-cca7adea2b42
        external ip: "172.16.104.200"
        logical ip: "172.16.102.11"
        type: "dnat_and_snat"
    nat de0cfce7-68c6-4612-bdf8-4eaa5299e6c8
        external ip: "172.16.104.201"
        logical ip: "172.16.103.11"
        type: "dnat_and_snat"
[root@dell-per740-18 ovn]# 

produce a lot of RARP packets on another machine on switch:

from scapy.all import *
>>> for x in range(1000):
...   sendp(Ether(src="00:de:ad:01:00:01",dst="ff:ff:ff:ff:ff:ff")/ARP(op=2,hwsrc="00:de:aq:01:00:01",hwdst="00:de:aq:01:00:01",psrc="172.16.102.99",pdst="172.16.102.99"),iface="ens4f1")

[root@dell-per740-18 ovn]# top

top - 03:07:50 up 23:17,  2 users,  load average: 0.00, 0.04, 0.12
Tasks: 525 total,   1 running, 524 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.0 us,  0.1 sy,  0.0 ni, 99.9 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem : 65280816 total, 57050184 free,  2590292 used,  5640340 buff/cache
KiB Swap: 32767996 total, 32767996 free,        0 used. 62195044 avail Mem 

   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                 
 28062 openvsw+  10 -10 3413452 141204  17936 S   3.4  0.2   0:43.34 ovs-vswitchd                                            
 28333 qemu      20   0 2890084 645860  10252 S   0.4  1.0   1:24.48 qemu-kvm                                                
 60418 root      20   0  162452   2724   1580 R   0.4  0.0   0:00.42 top                                                     
     1 root      20   0  193924   7064   4216 S   0.0  0.0   0:09.94 systemd                                                 
     2 root      20   0       0      0      0 S   0.0  0.0   0:00.03 kthreadd                                                
     4 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker/0:0H                                            
     5 root      20   0       0      0      0 S   0.0  0.0   0:00.00 kworker/u544:0                                          
     6 root      20   0       0      0      0 S   0.0  0.0   0:00.01 ksoftirqd/0                                             
     7 root      rt   0       0      0      0 S   0.0  0.0   0:00.47 migration/0     

[root@dell-per730-42 ovn]# top

top - 03:06:42 up 23:30,  2 users,  load average: 0.00, 0.04, 0.13
Tasks: 512 total,   1 running, 511 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.0 us,  0.0 sy,  0.0 ni,100.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem : 32744248 total, 25134632 free,  1972292 used,  5637324 buff/cache
KiB Swap: 16515068 total, 16515068 free,        0 used. 30344464 avail Mem 

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                  
31606 openvsw+  10 -10 3413444 140940  17936 S   1.3  0.4   0:14.10 ovs-vswitchd                                             
32456 root      20   0  162436   2704   1580 R   0.3  0.0   0:00.06 top                                                      
    1 root      20   0  193896   7052   4216 S   0.0  0.0   0:07.82 systemd                                                  
    2 root      20   0       0      0      0 S   0.0  0.0   0:00.02 kthreadd                                                 
    4 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker/0:0H                                             
    6 root      20   0       0      0      0 S   0.0  0.0   0:00.07 ksoftirqd/0                                              
    7 root      rt   0       0      0      0 S   0.0  0.0   0:01.03 migration/0                                              
    8 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcu_bh                                                   
    9 root      20   0       0      0      0 S   0.0  0.0   0:22.85 rcu_sched                                                
   10 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 lru-add-drain                                            
   11 root      rt   0       0      0      0 S   0.0  0.0   0:00.57 watchdog/0                                               
   12 root      rt   0       0      0      0 S   0.0  0.0   0:00.19 watchdog/1
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