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Troubleshooting VRRP, The screen frequently displays error prompts., Analysis, Solution

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Troubleshooting VRRP The screen frequently displays error prompts. Analysis This error is probably caused by: • Inconsistent configuration of the devices in the VRRP group. • A device is attempting to send illegitimate VRRP packets. Solution • In the first case, modify the configuration. • In the latter case, resort to non-technical measures. Multiple masters are present in the same VRRP group. Analysis • Multiple masters coexist for a short period: This is normal and requires no manual intervention. • Multiple masters coexist for a long period: This is because devices in the VRRP group cannot receive VRRP packets, or the received VRRP packets are illegal. Solution Ping between these masters, and do the following: • If the ping fails, check network connectivity. • If the ping succeeds, check that their configurations are consistent in terms of number of virtual IP addresses, virtual IP addresses, advertisement interval, and authentication. Frequent VRRP state transition. Analysis The VRRP advertisement interval is set too short. Solution Increase the interval to sent VRRP advertisement or introduce a preemption delay. 174

Section	Page
Title Page	1
High Availability Configuration Guide	3
High availability overview	8
Availability requirements	8
Availability evaluation	8
MTBF	8
MTTR	8
High availability technologies	9
Fault detection technologies	9
Protection switchover technologies	10
Configuring Ethernet OAM	12
Ethernet OAM overview	12
Major functions of Ethernet OAM	12
Ethernet OAMPDUs	12
How Ethernet OAM works	13
Ethernet OAM connection establishment	13
Link monitoring	14
Remote fault detection	15
Remote loopback	15
Standards and protocols	15
Ethernet OAM configuration task list	15
Configuring basic Ethernet OAM functions	16
Configuring link monitoring	16
Configuring errored symbol event detection	16
Configuring errored frame event detection	17
Configuring errored frame period event detection	17
Configuring errored frame seconds event detection	17
Configuring Ethernet OAM remote loopback	17
Enabling Ethernet OAM remote loopback	17
Configuration guidelines	18
Configuration procedure	18
Rejecting the Ethernet OAM remote loopback request from a remote port	19
Displaying and maintaining Ethernet OAM configuration	19
Ethernet OAM configuration example	20
Network requirements	20
Configuration procedure	20
Configuring CFD	22
Overview	22
Basic CFD concepts	22
MD	22
MA	22
MP	23
MEP list	24
CFD functions	24
CC	24
LB	24
LT	25
Protocols and standards	25
CFD configuration task list	25
Configuring basic CFD settings	26
Enabling CFD	26
Configuring the CFD protocol version	26
Configuring service instances	26
Creating a service instance with the MD name	27
Creating a service instance without the MD name	27
Configuring MEPs	27
Configuring MIP generation rules	28
Configuring CFD functions	28
Configuration prerequisites	28
Configuring CC on MEPs	28
Configuration guidelines	28
Configuration procedure	29
Configuring LB on MEPs	29
Configuring LT on MEPs	29
Displaying and maintaining CFD	30
CFD configuration example	31
Network requirements	31
Configuration procedure	32
Verifying the configuration	34
Configuring DLDP	35
DLDP overview	35
Background	35
How DLDP works	36
DLDP link states	36
DLDP timers	36
DLDP mode	37
DLDP authentication mode	38
DLDP processes	39
Link auto-recovery mechanism	41
DLDP neighbor state	41
DLDP configuration task list	42
Configuring the duplex mode and speed of an Ethernet interface	42
Enabling DLDP	43
Setting DLDP mode	43
Setting the interval to send advertisement packets	43
Setting the delaydown timer	44
Setting the port shutdown mode	44
Configuring DLDP authentication	45
Resetting DLDP state	45
Resetting DLDP state in system view	45
Resetting DLDP state in interface view	46
Displaying and maintaining DLDP	46
DLDP configuration examples	46
Automatically shutting down unidirectional links	46
Network requirements	46
Configuration procedure	47
Manually shutting down unidirectional links	50
Network requirements	50
Configuration procedure	50
Troubleshooting DLDP	53
Symptom	53
Analysis	53
Solution	53
Configuring RRPP	54
RRPP overview	54
Background	54
Basic concepts in RRPP	54
RRPP domain	54
RRPP ring	55
Control VLAN and data VLAN	55
Node	55
Primary port and secondary port	56
Common port and edge port	56
RRPP ring group	56
RRPPDUS	56
RRPP timers	57
How RRPP works	57
Polling mechanism	57
Link down alarm mechanism	58
Ring recovery	58
Broadcast storm suppression mechanism in a multi-homed subring in case of SRPT failure	58
Load balancing	58
RRPP ring group	58
Typical RRPP networking	59
Single ring	59
Tangent rings	59
Intersecting rings	60
Dual homed rings	60
Single-ring load balancing	61
Intersecting-ring load balancing	61
Protocols and standards	62
RRPP configuration task list	62
Creating an RRPP domain	63
Configuring control VLANs	63
Configuration guidelines	63
Configuration procedure	64
Configuring protected VLANs	64
Configuring RRPP rings	65
Configuring RRPP ports	65
Configuration guidelines	65
Configuration procedure	65
Configuring RRPP nodes	66
Specifying a master node	66
Specifying a transit node	66
Specifying an edge node	66
Specifying an assistant-edge node	67
Activating an RRPP domain	67
Configuring RRPP timers	68
Configuring an RRPP ring group	68
Configuration restrictions and guidelines	68
Configuration procedure	69
Displaying and maintaining RRPP	69
RRPP configuration examples	69
Single ring configuration example	69
Networking requirements	69
Configuration procedure	70
Intersecting ring configuration example	72
Networking requirements	72
Configuration procedure	73
Dual homed rings configuration example	77
Networking requirements	77
Configuration procedure	78
Intersecting-ring load balancing configuration example	87
Networking requirements	87
Configuration procedure	88
Troubleshooting	96
Symptom	96
Analysis	96
Solution	96
Configuring Smart Link	97
Smart Link overview	97
Background	97
Terminology	98
Smart link group	98
Master/slave port	98
Master/slave link	98
Flush message	98
Protected VLAN	98
Transmit control VLAN	98
Receive control VLAN	98
How Smart Link works	99
Link backup mechanism	99
Topology change mechanism	99
Role preemption mechanism	99
Load sharing mechanism	99
Smart Link collaboration mechanisms	99
Smart Link configuration task list	100
Configuring a Smart Link device	100
Configuration prerequisites	100
Configuring protected VLANs for a smart link group	100
Configuring member ports for a smart link group	101
In smart link group view	101
In interface view	101
Configuring role preemption for a smart link group	102
Enabling the sending of flush messages	102
Configuring an associated device	103
Configuration prerequisites	103
Enabling the receiving of flush messages	103
Configuration guidelines	103
Configuration procedure	103
Displaying and maintaining Smart Link	103
Smart Link configuration examples	104
Single smart link group configuration example	104
Network requirements	104
Configuration procedure	104
Multiple smart link groups load sharing configuration example	108
Network requirements	108
Configuration procedure	109
Configuring Monitor Link	113
Monitor Link overview	113
Terminology	113
Monitor link group	113
Uplink/Downlink ports	113
Uplink/Downlink	114
How Monitor Link works	114
Configuring Monitor Link	114
Configuration prerequisites	114
Creating a monitor link group	114
Configuring monitor link group member ports	114
In monitor link group view	114
In interface view	115
Displaying and maintaining Monitor Link	115
Monitor Link configuration example	115
Network requirements	115
Configuration procedure	116
Configuring VRRP	119
VRRP overview	119
VRRP standard protocol mode	120
Introduction to VRRP group	120
VRRP priority	120
Operation mode	121
Authentication mode	121
VRRP timers	121
VRRP advertisement interval timer	121
VRRP preemption delay timer	121
Packet format	122
Principles of VRRP	123
VRRP tracking	123
Tracking a specified interface	123
Monitoring a track entry	124
VRRP application (taking IPv4-based VRRP for example)	124
Master/backup	124
Load sharing	124
VRRP load balancing mode	125
Overview	125
Assigning virtual MAC addresses	126
Virtual forwarder	128
Creating a virtual forwarder	128
VF weight and priority	128
VF backup	128
VF timers	129
VF tracking	130
Packet types	130
Configuring VRRP for IPv4	130
VRRP for IPv4 configuration task list	130
Configuring a VRRP operation mode	131
Specifying the type of MAC addresses mapped to virtual IP addresses	131
Configuration guidelines	132
Configuration procedure	132
Creating a VRRP group and configuring virtual IP address	132
Configuration guidelines	132
Configuration prerequisites	133
Configuration procedure	133
Configuring router priority, preemptive mode and tracking function	133
Configuration guidelines	133
Configuration prerequisites	134
Configuration procedure	134
Configuring VF tracking	134
Configuration guidelines	134
Configuration prerequisites	135
Configuration procedure	135
Configuring VRRP packet attributes	135
Configuration guidelines	135
Configuration prerequisites	136
Configuration procedure	136
Enabling the trap function for VRRP	136
Displaying and maintaining VRRP for IPv4	136
Configuring VRRP for IPv6	137
VRRP for IPv6 configuration task list	137
Specifying the type of MAC addresses mapped to virtual IPv6 addresses	137
Creating a VRRP group and configuring a virtual IPv6 address	138
Configuration guidelines	138
Configuration prerequisites	139
Configuration procedure	139
Configuring router priority, preemptive mode and tracking function	139
Configuration guidelines	139
Configuration prerequisites	139
Configuration procedure	140
Configuring VF tracking	140
Configuration guidelines	140
Configuration prerequisites	140
Configuration procedure	140
Configuring VRRP packet attributes	141
Configuration guidelines	141
Configuration prerequisites	141
Configuration procedure	141
Displaying and maintaining VRRP for IPv6	142
IPv4-based VRRP configuration examples	142
Single VRRP group configuration example	142
Network requirements	142
Configuration procedure	143
VRRP interface tracking configuration example	145
Network requirements	145
Configuration procedure	146
VRRP with multiple VLANs configuration example	149
Network requirements	149
Configuration procedure	149
VRRP load balancing mode configuration example	151
Network requirements	151
Configuration procedure	152
IPv6-based VRRP configuration examples	161
Single VRRP group configuration example	161
Network requirements	161
Configuration procedure	162
VRRP interface tracking configuration example	164
Network requirements	164
Configuration procedure	165
VRRP with multiple VLANs configuration example	168
Network requirements	168
Configuration procedure	169
VRRP load balancing mode configuration example	172
Network requirements	172
Configuration procedure	172
Troubleshooting VRRP	181
The screen frequently displays error prompts.	181
Analysis	181
Solution	181
Multiple masters are present in the same VRRP group.	181
Analysis	181
Solution	181
Frequent VRRP state transition.	181
Analysis	181
Solution	181
Configuring BFD	182
BFD overview	182
How BFD works	182
Operation of BFD	182
BFD detection methods	183
BFD session modes	183
BFD operating modes	184
Dynamic BFD parameter changes	184
Authentication modes	184
BFD packet format	184
Supported features	186
Protocols and standards	186
Configuring BFD basic functions	186
Configuration prerequisites	186
Configuration procedure	186
Displaying and maintaining BFD	188
Configuring track	189
Track overview	189
Introduction to collaboration	189
Collaboration fundamentals	189
Collaboration between the track module and a detection module	189
Collaboration between the track module and an application module	190
Collaboration application example	190
Track configuration task list	190
Associating the track module with a detection module	191
Associating track with NQA	191
Associating track with BFD	191
Configuration prerequisites	192
Configuration procedure	192
Associating track with interface management	192
Associating the track module with an application module	193
Associating track with VRRP	193
Associating track with static routing	195
Displaying and maintaining track entries	196
Track configuration examples	196
VRRP-track-NQA collaboration configuration example (the master monitors the uplink)	196
Network requirements	196
Configuration procedure	197
Configuring BFD for a VRRP backup to monitor the master	200
Network requirements	200
Configuration procedure	200
Configuring BFD for the VRRP master to monitor the uplinks	203
Network requirements	203
Configuration procedure	203
Static routing-track-NQA collaboration configuration example	206
Network requirements	206
Configuration procedure	207
Static routing-Track-BFD collaboration configuration example	211
Network requirements	211
Configuration procedure	211
VRRP-track-interface management collaboration configuration example (the master monitors the uplink interface)	214
Network requirements	214
Configuration procedure	215
Support and other resources	218
Contacting HP	218
Subscription service	218
Related information	218
Documents	218
Websites	218
Conventions	219
Command conventions	219
GUI conventions	219
Symbols	219
Network topology icons	220
Port numbering in examples	220