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Bug 2166832

Summary:	Missing Neighbor Advertisements on router failover
Product:	Red Hat Enterprise Linux Fast Datapath	Reporter:	OVN Bot <ovn-bot>
Component:	ovn-2021	Assignee:	Ales Musil <amusil>
Status:	CLOSED ERRATA	QA Contact:	Jianlin Shi <jishi>
Severity:	high	Docs Contact:
Priority:	high
Version:	FDP 22.G	CC:	amusil, ctrautma, jiji, jishi, mmichels
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	ovn-2021-21.12.0-116.el8fdp	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-03-16 10:05:03 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OVN Bot 2023-02-03 05:08:13 UTC

This is an automatically-generated clone of issue https://bugzilla.redhat.com/show_bug.cgi?id=2131676

Comment 4 Jianlin Shi 2023-02-16 07:45:03 UTC

reproduced on ovn-2021-21.12.0-103.el8:

+ tcpdump -r ext1.pcap -nnle -v
reading from file ext1.pcap, link-type EN10MB (Ethernet)
dropped privs to tcpdump
02:40:03.430060 d6:1b:a8:9a:be:4d > 33:33:ff:9a:be:4d, ethertype IPv6 (0x86dd), length 86: (hlim 255, next-header ICMPv6 (58) payload length: 32) :: > ff02::1:ff9a:be4d: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has fe80::d41b:a8ff:fe9a:be4d
          unknown option (14), length 8 (1): 
          0x0000:  c1cc 6746 4427
02:40:03.478041 d6:1b:a8:9a:be:4d > 33:33:ff:00:00:02, ethertype IPv6 (0x86dd), length 86: (hlim 255, next-header ICMPv6 (58) payload length: 32) :: > ff02::1:ff00:2: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has fd12:3456:789a:1::2
          unknown option (14), length 8 (1): 
          0x0000:  b587 e14c 5f82
02:40:03.494030 d6:1b:a8:9a:be:4d > 33:33:00:00:00:16, ethertype IPv6 (0x86dd), length 110: (hlim 1, next-header Options (0) payload length: 56) :: > ff02::16: HBH (rtalert: 0x0000) (padn) [icmp6 sum ok] ICMP6, multicast listener report v2, 2 group record(s) [gaddr ff02::1:ff00:2 to_ex, 0 source(s)] [gaddr ff02::1:ff9a:be4d to_ex, 0 source(s)]
02:40:04.470096 d6:1b:a8:9a:be:4d > 33:33:00:00:00:16, ethertype IPv6 (0x86dd), length 110: (hlim 1, next-header Options (0) payload length: 56) fe80::d41b:a8ff:fe9a:be4d > ff02::16: HBH (rtalert: 0x0000) (padn) [icmp6 sum ok] ICMP6, multicast listener report v2, 2 group record(s) [gaddr ff02::1:ff00:2 to_ex, 0 source(s)] [gaddr ff02::1:ff9a:be4d to_ex, 0 source(s)]
02:40:04.470121 d6:1b:a8:9a:be:4d > 33:33:00:00:00:02, ethertype IPv6 (0x86dd), length 70: (hlim 255, next-header ICMPv6 (58) payload length: 16) fe80::d41b:a8ff:fe9a:be4d > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 16
          source link-address option (1), length 8 (1): d6:1b:a8:9a:be:4d
02:40:05.430037 d6:1b:a8:9a:be:4d > 33:33:00:00:00:16, ethertype IPv6 (0x86dd), length 110: (hlim 1, next-header Options (0) payload length: 56) fe80::d41b:a8ff:fe9a:be4d > ff02::16: HBH (rtalert: 0x0000) (padn) [icmp6 sum ok] ICMP6, multicast listener report v2, 2 group record(s) [gaddr ff02::1:ff00:2 to_ex, 0 source(s)] [gaddr ff02::1:ff9a:be4d to_ex, 0 source(s)]
02:40:08.310077 d6:1b:a8:9a:be:4d > 33:33:00:00:00:02, ethertype IPv6 (0x86dd), length 70: (hlim 255, next-header ICMPv6 (58) payload length: 16) fe80::d41b:a8ff:fe9a:be4d > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 16
          source link-address option (1), length 8 (1): d6:1b:a8:9a:be:4d
02:40:16.246078 d6:1b:a8:9a:be:4d > 33:33:00:00:00:02, ethertype IPv6 (0x86dd), length 70: (hlim 255, next-header ICMPv6 (58) payload length: 16) fe80::d41b:a8ff:fe9a:be4d > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 16
          source link-address option (1), length 8 (1): d6:1b:a8:9a:be:4d
+ sleep 2
+ ip netns exec ext1 tcpdump -i ext1 -w ext1_2.pcap -nnle
dropped privs to tcpdump
tcpdump: listening on ext1, link-type EN10MB (Ethernet), capture size 262144 bytes
+ ovn-nbctl --wait=hv set logical_router lr0 options:chassis=hv0
+ sleep 2
+ ovn-nbctl set logical_router lr0 options:chassis=hv1
+ sleep 5
+ pkill tcpdump
+ sleep 2
0 packets captured
1 packet received by filter
0 packets dropped by kernel
+ tcpdump -r ext1_2.pcap -nnle -v
reading from file ext1_2.pcap, link-type EN10MB (Ethernet)
dropped privs to tcpdump
[root@wsfd-advnetlab16 bz2131676]# rpm -qa | grep -E "openvswitch2.17|ovn-2021"
python3-openvswitch2.17-2.17.0-60.el8fdp.x86_64
ovn-2021-central-21.12.0-103.el8fdp.x86_64
openvswitch2.17-2.17.0-60.el8fdp.x86_64
ovn-2021-host-21.12.0-103.el8fdp.x86_64
ovn-2021-21.12.0-103.el8fdp.x86_64

result on ovn-2021-21.12.0-116.el8:

[root@wsfd-advnetlab16 bz2131676]# rpm -qa | grep -E "openvswitch2.17|ovn-2021"
python3-openvswitch2.17-2.17.0-60.el8fdp.x86_64
ovn-2021-central-21.12.0-116.el8fdp.x86_64
ovn-2021-host-21.12.0-116.el8fdp.x86_64
openvswitch2.17-2.17.0-60.el8fdp.x86_64
ovn-2021-21.12.0-116.el8fdp.x86_64

+ tcpdump -r ext1.pcap -nnle -v                                                                       
reading from file ext1.pcap, link-type EN10MB (Ethernet)
dropped privs to tcpdump
02:42:15.702033 a2:4b:11:4d:06:d7 > 33:33:ff:4d:06:d7, ethertype IPv6 (0x86dd), length 86: (hlim 255, next-header ICMPv6 (58) payload length: 32) :: > ff02::1:ff4d:6d7: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has fe80::a04b:11ff:fe4d:6d7
          unknown option (14), length 8 (1):                                                          
          0x0000:  c48a 59ef 38fb                                                                     
02:42:16.006043 a2:4b:11:4d:06:d7 > 33:33:00:00:00:16, ethertype IPv6 (0x86dd), length 110: (hlim 1, next-header Options (0) payload length: 56) :: > ff02::16: HBH (rtalert: 0x0000) (padn) [icmp6 sum ok] ICMP6, multicast listener report v2, 2 group record(s) [gaddr ff02::1:ff00:2 to_ex, 0 source(s)] [gaddr ff02::1:ff4d:6d7 to_ex, 0 source(s)]
02:42:16.566059 a2:4b:11:4d:06:d7 > 33:33:ff:00:00:02, ethertype IPv6 (0x86dd), length 86: (hlim 255, next-header ICMPv6 (58) payload length: 32) :: > ff02::1:ff00:2: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has fd12:3456:789a:1::2                                                        
          unknown option (14), length 8 (1): 
          0x0000:  537a a4f5 9839                                                                     
02:42:16.758100 a2:4b:11:4d:06:d7 > 33:33:00:00:00:16, ethertype IPv6 (0x86dd), length 110: (hlim 1, next-header Options (0) payload length: 56) fe80::a04b:11ff:fe4d:6d7 > ff02::16: HBH (rtalert: 0x0000) (padn) [icmp6 sum ok] ICMP6, multicast listener report v2, 2 group record(s) [gaddr ff02::1:ff00:2 to_ex, 0 source(s)] [gaddr ff02::1:ff4d:6d7 to_ex, 0 source(s)]
02:42:16.758136 a2:4b:11:4d:06:d7 > 33:33:00:00:00:02, ethertype IPv6 (0x86dd), length 70: (hlim 255, next-header ICMPv6 (58) payload length: 16) fe80::a04b:11ff:fe4d:6d7 > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 16                                                                        
          source link-address option (1), length 8 (1): a2:4b:11:4d:06:d7
02:42:17.526015 a2:4b:11:4d:06:d7 > 33:33:00:00:00:16, ethertype IPv6 (0x86dd), length 110: (hlim 1, next-header Options (0) payload length: 56) fe80::a04b:11ff:fe4d:6d7 > ff02::16: HBH (rtalert: 0x0000) (padn) [icmp6 sum ok] ICMP6, multicast listener report v2, 2 group record(s) [gaddr ff02::1:ff00:2 to_ex, 0 source(s)] [gaddr ff02::1:ff4d:6d7 to_ex, 0 source(s)]
02:42:18.706126 f0:00:00:00:00:01 > ff:ff:ff:ff:ff:ff, ethertype Reverse ARP (0x8035), length 42: Ethernet (len 6), IPv4 (len 4), Reverse Request who-is f0:00:00:00:00:01 tell f0:00:00:00:00:01, length 28
02:42:20.708302 f0:00:00:00:00:01 > ff:ff:ff:ff:ff:ff, ethertype Reverse ARP (0x8035), length 42: Ethernet (len 6), IPv4 (len 4), Reverse Request who-is f0:00:00:00:00:01 tell f0:00:00:00:00:01, length 28
02:42:20.790061 a2:4b:11:4d:06:d7 > 33:33:00:00:00:02, ethertype IPv6 (0x86dd), length 70: (hlim 255, next-header ICMPv6 (58) payload length: 16) fe80::a04b:11ff:fe4d:6d7 > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 16                                                                        
          source link-address option (1), length 8 (1): a2:4b:11:4d:06:d7
02:42:24.712480 f0:00:00:00:00:01 > ff:ff:ff:ff:ff:ff, ethertype Reverse ARP (0x8035), length 42: Ethernet (len 6), IPv4 (len 4), Reverse Request who-is f0:00:00:00:00:01 tell f0:00:00:00:00:01, length 28
02:42:28.854102 a2:4b:11:4d:06:d7 > 33:33:00:00:00:02, ethertype IPv6 (0x86dd), length 70: (hlim 255, next-header ICMPv6 (58) payload length: 16) fe80::a04b:11ff:fe4d:6d7 > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 16                                                                        
          source link-address option (1), length 8 (1): a2:4b:11:4d:06:d7                             
+ sleep 2                                                                                             
+ ip netns exec ext1 tcpdump -i ext1 -w ext1_2.pcap -nnle                                             
dropped privs to tcpdump                                                                              
tcpdump: listening on ext1, link-type EN10MB (Ethernet), capture size 262144 bytes                    
+ ovn-nbctl --wait=hv set logical_router lr0 options:chassis=hv0                                      
+ sleep 2                                                                                             
+ ovn-nbctl set logical_router lr0 options:chassis=hv1                                                
+ sleep 5                                                                                             
+ pkill tcpdump                                                                                       
0 packets captured                                                                                    
0 packets received by filter                                                                          
0 packets dropped by kernel                                                                           
+ sleep 2                                                                                             
+ tcpdump -r ext1_2.pcap -nnle -v                                                                     
reading from file ext1_2.pcap, link-type EN10MB (Ethernet)                                            
dropped privs to tcpdump

<=== there is no rarp received when change the chassis setting, Ales, could you help to check?

Comment 5 Ales Musil 2023-02-21 07:53:46 UTC

Hi, 

does it work if you insert: "ovn-appctl inc-engine/recompute" after "ovn-nbctl --wait=hv set logical_router lr0 options:chassis=hv0"?

Unfortunately the datapath is not removed until recompute happens, so the patch port lingers there
and controller does not send new updates because of that.

Comment 6 Jianlin Shi 2023-02-21 10:08:35 UTC

(In reply to Ales Musil from comment #5)
> Hi, 
> 
> does it work if you insert: "ovn-appctl inc-engine/recompute" after
> "ovn-nbctl --wait=hv set logical_router lr0 options:chassis=hv0"?
> 
> Unfortunately the datapath is not removed until recompute happens, so the
> patch port lingers there
> and controller does not send new updates because of that.

yes, after add "ovn-appctl inc-engine/recompute", rarp is received.

Comment 8 errata-xmlrpc 2023-03-16 10:05:03 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 (ovn-2021 bug fix and enhancement update), 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-2023:1289