H3c-technologies H3C WX5500E Series Access Controllers Manuel d'utilisateur Page 45
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in the section Aggregating links in static mode or Choosing a reference port in the section Aggregating
links in dynamic mode.
Link aggregation modes
Link aggregation has the following modes: dynamic and static. Dynamic link aggregation uses Link
Aggregation Control Protocol (LACP) and static link aggregation does not. Table 3 c
ompares the two
aggregation modes.
Table 3 A comparison between static and dynamic aggregation modes
Aggregation
mode
LACP status on
member
p
orts
Pros Cons
Static Disabled
Aggregation is stable. Peers do
not affect the aggregation state of
the member ports.
The member ports do not adjust
the aggregation state according
to that of the peer ports. The
administrator must manually
maintain link aggregations.
Dynamic Enabled
The peer systems maintain the
aggregation state of the member
ports automatically.
Aggregation is unstable. The
aggregation state of the member
ports is susceptible to network
changes.
The following points apply to a dynamic link aggregation group:
• A Selected port can receive and send link aggregation control protocol data units (LACPDUs).
• An Unselected port can receive and send LACPDUs only if it is up and has the same class-two
configurations as the aggregate interface.
LACP
The IEEE 802.3ad LACP enables dynamic aggregation of physical links. It uses link aggregation control
protocol data units (LACPDUs) for exchanging aggregation information between LACP-enabled devices.
• LACP functions
The IEEE 802.3ad LACP offers basic LACP functions and extended LACP functions, as described
in Table 4.
Table 4 Basic and ext
ended LACP functions
Category Description
Basic LACP functions
Implemented through the basic LACPDU fields, including the system LACP
priority, system MAC address, port aggregation priority, port number, and
operational key.
Each member port in a LACP-enabled aggregation group exchanges the
preceding information with its peer. When a member port receives an LACPDU,
it compares the received information with the information received on the other
member ports. In this way, the two systems reach an agreement on which ports
should be placed in Selected state.
Extended LACP
functions
Implemented by extending the LACPDU with new TLV fields.
• LACP priorities
LACP priorities have the following types: system LACP priority and port aggregation priority.
- H3C WX5540E Access Controller 1
- Switching Engine 1
- Preface 3
- Symbols 4
- Network topology icons 4
- Port numbering in examples 4
- Obtaining documentation 5
- Technical support 5
- Documentation feedback 5
- Contents 6
- Switch A Switch B 14
- Switch C 14
- Enabling auto power-down 17
- Bulk configuring interfaces 30
- Configuring MAC Information 39
- Operational key 44
- Configuration classes 44
- Reference port 44
- Link aggregation modes 45
- Choosing a reference port 46
- Configuring port isolation 63
- STP protocol packets 65
- Basic concepts in STP 66
- Path cost 67
- STP timers 71
- MSTP features 73
- MSTP basic concepts 73
- MST region 74
- Regional root 75
- Common root bridge 75
- Port roles 75
- How MSTP works 76
- STP configuration task list 78
- RSTP configuration task list 79
- PVST configuration task list 80
- MSTP configuration task list 81
- Configuring an MST region 82
- Configuring edge ports 89
- Performing mCheck 96
- Configuring digest snooping 97
- <DeviceB> system-view 99
- Configuration prerequisites 100
- Configuration procedure 100
- Configuration example 101
- Enabling BPDU guard 101
- Enabling root guard 102
- Enabling loop guard 102
- Enabling TC-BPDU guard 103
- Enabling BPDU drop 104
- MSTP configuration example 105
- PVST configuration example 109
- Configuring BPDU tunneling 113
- Enabling BPDU tunneling 116
- Network requirements 117
- Configuring VLANs 120
- VLAN frame encapsulation 121
- VLAN types 122
- Protocols and standards 122
- Configuring port-based VLANs 125
- Frame handling on a port 126
- Verifying the configuration 130
- Configuring MAC-based VLANs 131
- Configuration considerations 136
- Configuration guidelines 142
- Task Command 143
- Remarks 143
- Configuring super VLANs 144
- Name: VLAN 0005 148
- Tagged Ports: none 148
- Untagged Ports: 148
- Configuring voice VLANs 158
- VLAN assignment mode 162
- Configuring GVRP 169
- GARP timers 170
- GARP PDU format 171
- Introduction to GVRP 172
- GVRP registration modes 172
- GVRP configuration task list 173
- Configuring GVRP functions 173
- Configuring the GARP timers 174
- GVRP configuration examples 176
- Configuring LLDP 181
- LLDPDUs 182
- LLDP-MED TLVs 184
- Working mechanism 185
- LLDP configuration task list 186
- Enabling LLDP polling 188
- Configuring LLDP trapping 193
- LLDP configuration examples 194
- Overview 199
- Configuring MVRP 203
- MRP messages 204
- MRP timers 205
- MVRP configuration task list 206
- Enabling MVRP 207
- Configuring MRP timers 208
- Enabling GVRP compatibility 209
- Configuring Device B 212
- Configuring Device C 213
- Configuring Device D 214
- 1(default), 10 219
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