lacp agreement

DYNAMIC LINK

AGGREGATION LINK AGGREGATION CONTROL

PROTOCOL

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LACP FEATURES

AUTOMATIC FAILOVER

FAILED PORT REPLACEMENT WITH HOT-STANDBY PORT

LOAD BALANCING

AUTOMATIC LEARNING OF LAG CAPABILITIES

AUTOMATIC CONFIGURATION VERIFICATION

LACP AGREEMENT PROCESS

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WHAT IS LACP AGREEMENT

Link Aggregation Control Protocol (LACP) enables allows a network device to negotiate an

automatic bundling of links by sending LACP packets to the peer (directly connected device

that also implements LACP).

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STEP 1: SENDING THE FIRST LACPDU

Actor System: 00:01:02:03:04:05 Actor Key: 1000

? Port added to

LAG

Device №1 Device №2

LACPDU

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STEP 1: STRUCTURE OF THE FIRST LACPDU

Actor information TLV

Actor System Priority: 1 Actor System (MAC): 00:01:02:03:04:05 Actor Key: 1000 Actor Port Priority: 1 Actor Port: 1 Actor State: LACP Activity: Active LACP Timeout: Long Aggregation: Aggregatable Synchronization: OUT_OF_SYNC Collecting: Disabled Distributing: Disabled Defaulted: Yes Expired: No

Partner information TLV

Partner System Priority: 0 Partner System (MAC): 00:00:00:00:00:00 Partner Key: 0 Partner Port Priority: 0 Partner Port: 0 Partner State: LACP Activity: Active LACP Timeout: Long Aggregation: Aggregatable Synchronization: OUT_OF_SYNC Collecting: Disabled Distributing: Disabled Defaulted: Yes Expired: No

LACPDU

Actor: Device №1

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STEP 2: SENDING LACPDU. D2 -> D1

Actor System: 00:01:02:03:04:05 Actor Key: 1000

Actor System: 00:06:07:08:09:0A Actor Key: 20 Actor State: Defaulted - No Partner System: 00:01:02:03:04:05 Partner Key: 1000

Device №1 Device №2

LACPDU

Port added to

LAG

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STEP 2: STRUCTURE OF SENT LACPDU

Actor information TLV

Actor System Priority: 50 Actor System (MAC): 00:06:07:08:09:0A Actor Key: 20 Actor Port Priority: 50 Actor Port: 1 Actor State: LACP Activity: Active LACP Timeout: Long Aggregation: Aggregatable Synchronization: OUT_OF_SYNC Collecting: Disabled Distributing: Disabled Defaulted: No Expired: No

Partner information TLV

Partner System Priority: 1 Partner System (MAC): 00:01:02:03:04:05 Partner Key: 1000 Partner Port Priority: 1 Partner Port: 1 Partner State: LACP Activity: Active LACP Timeout: Long Aggregation: Aggregatable Synchronization: OUT_OF_SYNC Collecting: Disabled Distributing: Disabled Defaulted: Yes Expired: No

LACPDU

Actor: Device №2

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STEP 3: SENDING LACPDU. D1 -> D2

Actor System: 00:01:02:03:04:05 Actor Key: 1000 Actor State: Defaulted - No Actor State: Sync – IN_SYNC Partner System: 00:06:07:08:09:0A Partner Key: 20

Actor System: 00:06:07:08:09:0A Actor Key: 20 Partner System: 00:01:02:03:04:05 Partner Key: 1000

Device №1 Device №2

LACPDU

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STEP 3: STRUCTURE OF SENT LACPDU

Actor information TLV

Actor System Priority: 1 Actor System (MAC): 00:01:02:03:04:05 Actor Key: 1000 Actor Port Priority: 1 Actor Port: 1 Actor State: LACP Activity: Active LACP Timeout: Long Aggregation: Aggregatable Synchronization: IN_SYNC Collecting: Disabled Distributing: Disabled Defaulted: No Expired: No

Partner information TLV

Partner System Priority: 50 Partner System (MAC): 00:06:07:08:09:0A Partner Key: 20 Partner Port Priority: 50 Partner Port: 1 Partner State: LACP Activity: Active LACP Timeout: Long Aggregation: Aggregatable Synchronization: OUT_OF_SYNC Collecting: Disabled Distributing: Disabled Defaulted: No Expired: No

LACPDU

Actor: Device №1

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STEP 4: SENDING LACPDU. D2 -> D1

Actor System: 00:01:02:03:04:05 Actor Key: 1000 Partner System: 00:06:07:08:09:0A Partner Key: 20

Actor System: 00:06:07:08:09:0A Actor Key: 20 Actor State: Sync – In_Sync Partner System: 00:01:02:03:04:05 Partner Key: 1000

Device №1 Device №2

LACPDU

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STEP 4: STRUCTURE OF SENT LACPDU

Actor information TLV

Actor System Priority: 50 Actor System (MAC): 00:06:07:08:09:0A Actor Key: 20 Actor Port Priority: 50 Actor Port: 1 Actor State: LACP Activity: Active LACP Timeout: Long Aggregation: Aggregatable Synchronization: IN_SYNC Collecting: Disabled Distributing: Disabled Defaulted: No Expired: No

Partner information TLV

Partner System Priority: 1 Partner System (MAC): 00:01:02:03:04:05 Partner Key: 1000 Partner Port Priority: 1 Partner Port: 1 Partner State: LACP Activity: Active LACP Timeout: Long Aggregation: Aggregatable Synchronization: IN_SYNC Collecting: Disabled Distributing: Disabled Defaulted: No Expired: No

LACPDU

Actor: Device №2

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STEP 5: SENDING LACPDU. D1 -> D2

Actor System: 00:01:02:03:04:05 Actor Key: 1000 Actor State: Collecting Enabled Distributing Enabled Partner System: 00:06:07:08:09:0A Partner Key: 20

Actor System: 00:06:07:08:09:0A Actor Key: 20 Partner System: 00:01:02:03:04:05 Partner Key: 1000

Device №1 Device №2

LACPDU

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STEP 5: STRUCTURE OF SENT LACPDU

Actor information TLV

Actor System Priority: 1 Actor System (MAC): 00:01:02:03:04:05 Actor Key: 1000 Actor Port Priority: 1 Actor Port: 1 Actor State: LACP Activity: Active LACP Timeout: Long Aggregation: Aggregatable Synchronization: IN_SYNC Collecting: Enabled Distributing: Enabled Defaulted: No Expired: No

Partner information TLV

Partner System Priority: 50 Partner System (MAC): 00:06:07:08:09:0A Partner Key: 20 Partner Port Priority: 50 Partner Port: 1 Partner State: LACP Activity: Active LACP Timeout: Long Aggregation: Aggregatable Synchronization: IN_SYNC Collecting: Disabled Distributing: Disabled Defaulted: No Expired: No

LACPDU

Actor: Device №1

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STEP 6: SENDING LACPDU. D2 -> D1

Actor System: 00:01:02:03:04:05 Actor Key: 1000 Partner System: 00:06:07:08:09:0A Partner Key: 20

Actor System: 00:06:07:08:09:0A Actor Key: 20 Actor State: Collecting Enabled Distributing Enabled Partner System: 00:01:02:03:04:05 Partner Key: 1000

Device №1 Device №2

LACPDU

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STEP 6: STRUCTURE OF SENT LACPDU

Actor information TLV

Actor System Priority: 50 Actor System (MAC): 00:06:07:08:09:0A Actor Key: 20 Actor Port Priority: 50 Actor Port: 1 Actor State: LACP Activity: Active LACP Timeout: Long Aggregation: Aggregatable Synchronization: IN_SYNC Collecting: Enabled Distributing: Enabled Defaulted: No Expired: No

Partner information TLV

Partner System Priority: 1 Partner System (MAC): 00:01:02:03:04:05 Partner Key: 1000 Partner Port Priority: 1 Partner Port: 1 Partner State: LACP Activity: Active LACP Timeout: Long Aggregation: Aggregatable Synchronization: IN_SYNC Collecting: Enabled Distributing: Enabled Defaulted: No Expired: No

LACPDU

Actor: Device №2

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BE WARNED

In addition to IEEE standard where LACP operations are described, vendors have their

own proprietary aggregation schemes. However, the main principles remain the same.

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