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Nexus シリーズ : LACP max-bundle と min-links

Kenji Takahagi
Cisco Employee
Cisco Employee

‎2019-12-13 04:11 PM ‎2020-04-09 10:35 AM 更新

 

 

はじめに

LACP で提供される機能の max-bundle と min-links の機能について記述します。

設定の矛盾を回避するため、max-bundle や min-links で指定するポート数や、bundle されるポートの lacp port-priority は接続されるポートの間(例: switch A の eth 1/1 と switch B の eth 1/1) で同じ値を設定する必要があります。

  

 

LACP max-bundle

port-channel として含まれる最大の物理ポート数を指定します。

 

Switch(config)# int po 1
Switch(config-if)# lacp max-bundle 1
Switch(config-if)# end
Switch#
Switch# show run int po 1

interface port-channel1
  switchport
  switchport mode trunk
  lacp max-bundle 1

 

この例では、ethernet 1/1 と 1/2 が port-channel 1 として接続し、max-bundle を 1 と設定しています。
接続されているポートが 2 つであるのに対し、max-bundle が 1 と設定されているため、1 つのポートは
Hot-Standby となります。

 

Switch# show port-channel summary
Flags:  D - Down        P - Up in port-channel (members)
        I - Individual  H - Hot-standby (LACP only)
        s - Suspended   r - Module-removed
        b - BFD Session Wait
        S - Switched    R - Routed
        U - Up (port-channel)
        p - Up in delay-lacp mode (member)
        M - Not in use. Min-links not met
--------------------------------------------------------------------------------
Group Port-       Type     Protocol  Member Ports
      Channel
--------------------------------------------------------------------------------
1     Po1(SU)     Eth      LACP      Eth1/1(P)    Eth1/2(H)

 

どのポートが hot-standby になるかは、lacp port-priority に応じて決定されます。

 

矛盾を避けるため、lacp port-priority の値は接続されるポート双方で同じ値に設定します。

以下の例では、eth1/1 に lacp priority 2 を、eth1/2 に lacp port-priority 1 を設定し、数値の低い eth1/2 が優先的に接続されるよう調整しています。

 

Switch# show run int e 1/1-2

interface Ethernet1/1
  lacp port-priority 2
  switchport
  switchport mode trunk
  channel-group 1 mode active
  no shutdown

interface Ethernet1/2
  lacp port-priority 1
  switchport
  switchport mode trunk
  channel-group 1 mode active
  no shutdown

Switch# show port-channel summary
Flags:  D - Down        P - Up in port-channel (members)
        I - Individual  H - Hot-standby (LACP only)
        s - Suspended   r - Module-removed
        b - BFD Session Wait
        S - Switched    R - Routed
        U - Up (port-channel)
        p - Up in delay-lacp mode (member)
        M - Not in use. Min-links not met
--------------------------------------------------------------------------------
Group Port-       Type     Protocol  Member Ports
      Channel
--------------------------------------------------------------------------------
1     Po1(SU)     Eth      LACP      Eth1/1(H)    Eth1/2(P)

 

このとき、Hot-standbyとなっているポートの LACP state は 0x5 となっています。 LACP state の詳細は、Nexus シリーズ : LACP Data Unit に記載しています。

 

Switch# show lacp interface e 1/1
Interface Ethernet1/1 is hot-standby
  Channel group is 1 port channel is Po1
  PDUs sent: 74
  PDUs rcvd: 71
  Markers sent: 0
  Markers rcvd: 0
  Marker response sent: 0
  Marker response rcvd: 0
  Unknown packets rcvd: 0
  Illegal packets rcvd: 0
Lag Id: [ [(8000, 0-be-75-18-f3-f7, 8000, 2, 101), (8000, 0-be-75-19-36-d7, 8000, 2, 101)] ]
Operational as aggregated link since Thu Dec 12 07:07:36 2019

Local Port: Eth1/1   MAC Address= 0-be-75-19-36-d7
  System Identifier=0x8000,  Port Identifier=0x2,0x101
  Operational key=32768
  LACP_Activity=active
  LACP_Timeout=Long Timeout (30s)
  Synchronization=NOT_IN_SYNC
  Collecting=false
  Distributing=false
  Partner information refresh timeout=Long Timeout (90s)
Actor Admin State=5
Actor Oper State=5
Neighbor: 0x101
  MAC Address= 0-be-75-18-f3-f7
  System Identifier=0x8000,  Port Identifier=0x2,0x101
  Operational key=32768
  LACP_Activity=active
  LACP_Timeout=Long Timeout (30s)
  Synchronization=NOT_IN_SYNC
  Collecting=false
  Distributing=false
Partner Admin State=5
Partner Oper State=5
Aggregate or Individual(True=1)= 1
Switch# show lacp neighbor int po 1
Flags:  S - Device is sending Slow LACPDUs F - Device is sending Fast LACPDUs
        A - Device is in Active mode       P - Device is in Passive mode
port-channel1 neighbors
Partner's information
            Partner                Partner                     Partner
Port        System ID              Port Number     Age         Flags
Eth1/1      32768,0-be-75-18-f3-f7 0x101           534         SA

            LACP Partner           Partner                     Partner
            Port Priority          Oper Key                    Port State
            2                      0x8000                      0x5

Partner's information
            Partner                Partner                     Partner
Port        System ID              Port Number     Age         Flags
Eth1/2      32768,0-be-75-18-f3-f7 0x105           524         SA

            LACP Partner           Partner                     Partner
            Port Priority          Oper Key                    Port State
            1                      0x8000                      0x3d

この状態で、ポートチャネルとしてアップしている Eth1/2 がダウンすると、Hot-standby であった Eth1/1 がポートチャネルとして動作を開始します。

2019 Dec 12 07:20:52 Switch %ETH_PORT_CHANNEL-5-PORT_HOT_STANDBY_DOWN: port-channel1: hot-standby port Ethernet1/1 is down
2019 Dec 12 07:20:53 Switch %ETH_PORT_CHANNEL-5-PORT_UP: port-channel1: Ethernet1/1 is up
2019 Dec 12 07:20:53 Switch %ETH_PORT_CHANNEL-5-PORT_DOWN: port-channel1: Ethernet1/2 is down
2019 Dec 12 07:20:53 Switch %ETH_PORT_CHANNEL-5-FOP_CHANGED: port-channel1: first operational port changed from Ethernet1/2 to Ethernet1/1
2019 Dec 12 07:20:53 Switch %ETHPORT-5-IF_DOWN_INITIALIZING: Interface Ethernet1/2 is down (Initializing)
2019 Dec 12 07:20:53 Switch %ETHPORT-5-IF_UP: Interface Ethernet1/1 is up in mode trunk

Switch#
Switch# show port-channel sum
Flags:  D - Down        P - Up in port-channel (members)
        I - Individual  H - Hot-standby (LACP only)
        s - Suspended   r - Module-removed
        b - BFD Session Wait
        S - Switched    R - Routed
        U - Up (port-channel)
        p - Up in delay-lacp mode (member)
        M - Not in use. Min-links not met
--------------------------------------------------------------------------------
Group Port-       Type     Protocol  Member Ports
      Channel
--------------------------------------------------------------------------------
1     Po1(SU)     Eth      LACP      Eth1/1(P)    Eth1/2(D)

再度、eth1/2 が UP した場合、Hot-standby になるポートの選考が lacp port-priority に応じて行われ、eth 1/1 が再び Hot-standby となります。

2019 Dec 12 07:23:04 Switch %ETHPORT-5-SPEED: Interface Ethernet1/2, operational speed changed to 10 Gbps
2019 Dec 12 07:23:04 Switch %ETHPORT-5-IF_DUPLEX: Interface Ethernet1/2, operational duplex mode changed to Full
2019 Dec 12 07:23:04 Switch %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet1/2, operational Receive Flow Control state changed to off
2019 Dec 12 07:23:04 Switch %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet1/2, operational Transmit Flow Control state changed to off
2019 Dec 12 07:23:07 Switch %ETHPORT-5-IF_DOWN_PORT_CHANNEL_MEMBERS_DOWN: Interface port-channel1 is down (No operational members)
2019 Dec 12 07:23:07 Switch %ETH_PORT_CHANNEL-5-PORT_DOWN: port-channel1: Ethernet1/1 is down
2019 Dec 12 07:23:07 Switch %ETH_PORT_CHANNEL-5-FOP_CHANGED: port-channel1: first operational port changed from Ethernet1/1 to none
2019 Dec 12 07:23:07 Switch %ETHPORT-5-IF_DOWN_INITIALIZING: Interface Ethernet1/1 is down (Initializing)
2019 Dec 12 07:23:07 Switch %ETHPORT-5-IF_DOWN_PORT_CHANNEL_MEMBERS_DOWN: Interface port-channel1 is down (No operational members)
2019 Dec 12 07:23:10 Switch last message repeated 1 time
2019 Dec 12 07:23:10 Switch %ETH_PORT_CHANNEL-5-PORT_HOT_STANDBY: port-channel1: Ethernet1/1 goes to hot-standby
2019 Dec 12 07:23:10 Switch %ETH_PORT_CHANNEL-5-PORT_UP: port-channel1: Ethernet1/2 is up
2019 Dec 12 07:23:10 Switch %ETH_PORT_CHANNEL-5-FOP_CHANGED: port-channel1: first operational port changed from none to Ethernet1/2
2019 Dec 12 07:23:10 Switch %ETHPORT-5-IF_UP: Interface Ethernet1/2 is up in mode trunk
2019 Dec 12 07:23:10 Switch %ETHPORT-5-IF_UP: Interface port-channel1 is up in mode trunk

Switch#
Switch# show port-ch su
Flags:  D - Down        P - Up in port-channel (members)
        I - Individual  H - Hot-standby (LACP only)
        s - Suspended   r - Module-removed
        b - BFD Session Wait
        S - Switched    R - Routed
        U - Up (port-channel)
        p - Up in delay-lacp mode (member)
        M - Not in use. Min-links not met
--------------------------------------------------------------------------------
Group Port-       Type     Protocol  Member Ports
      Channel
--------------------------------------------------------------------------------
1     Po1(SU)     Eth      LACP      Eth1/1(H)    Eth1/2(P)

 

 

LACP min-links

port-channel として動作するために必要最低限の物理ポート数を指定します。

 

Switch# conf t
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# int po 1
Switch(config-if)# lacp min-links 2
Switch(config-if)#
Switch(config-if)# show run int po 1

interface port-channel1
  switchport
  switchport mode trunk
  lacp min-links 2

上記は、LACP の port-channel として動作するために、最低限 2 つのポートが接続されている必要があることを設定しています。

もし 1 ポートのみの接続であった場合、port-channel は suspend となり、通信を行うことはできません。

 

2019 Dec 12 07:30:06 Switch %ETH_PORT_CHANNEL-5-PORT_DOWN: port-channel1: Ethernet1/1 is down
2019 Dec 12 07:30:06 Switch %ETHPORT-5-IF_DOWN_INITIALIZING: Interface Ethernet1/1 is down (Initializing)
2019 Dec 12 07:30:08 Switch %ETHPORT-5-IF_DOWN_PORT_CHANNEL_MEMBERS_DOWN: Interface port-channel1 is down (No operational members)
2019 Dec 12 07:30:08 Switch %ETH_PORT_CHANNEL-5-PORT_DOWN: port-channel1: Ethernet1/2 is down
2019 Dec 12 07:30:08 Switch %ETH_PORT_CHANNEL-5-FOP_CHANGED: port-channel1: first operational port changed from Ethernet1/2 to none
2019 Dec 12 07:30:08 Switch %ETHPORT-5-IF_DOWN_INITIALIZING: Interface Ethernet1/2 is down (Initializing)
2019 Dec 12 07:30:08 Switch %ETHPORT-5-IF_DOWN_PORT_CHANNEL_MEMBERS_DOWN: Interface port-channel1 is down (No operational members)
2019 Dec 12 07:30:08 Switch last message repeated 1 time
2019 Dec 12 07:30:08 Switch %ETHPORT-5-SPEED: Interface port-channel1, operational speed changed to 10 Gbps
2019 Dec 12 07:30:08 Switch %ETHPORT-5-IF_DUPLEX: Interface port-channel1, operational duplex mode changed to Full
2019 Dec 12 07:30:08 Switch %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface port-channel1, operational Receive Flow Control state changed to off
2019 Dec 12 07:30:08 Switch %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface port-channel1, operational Transmit Flow Control state changed to off
2019 Dec 12 07:30:11 Switch %ETH_PORT_CHANNEL-5-PORT_SUSPENDED: Ethernet1/2: Ethernet1/2 is suspended

Switch#
Switch# show port-channel sum
Flags:  D - Down        P - Up in port-channel (members)
        I - Individual  H - Hot-standby (LACP only)
        s - Suspended   r - Module-removed
        b - BFD Session Wait
        S - Switched    R - Routed
        U - Up (port-channel)
        p - Up in delay-lacp mode (member)
        M - Not in use. Min-links not met
--------------------------------------------------------------------------------
Group Port-       Type     Protocol  Member Ports
      Channel
--------------------------------------------------------------------------------
1     Po1(SM)     Eth      LACP      Eth1/1(D)    Eth1/2(s)
Switch#
Switch# show int po 1
port-channel1 is down (suspended(min-links))
admin state is up,
  Hardware: Port-Channel, address: 00be.7519.36d9 (bia 00be.7519.36d9)
  MTU 1500 bytes, BW 100000 Kbit, DLY 10 usec
  reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, medium is broadcast
  Port mode is trunk
  auto-duplex, auto-speed
  Input flow-control is off, output flow-control is off
  Auto-mdix is turned off
  Switchport monitor is off
  EtherType is 0x8100
  Members in this channel: Eth1/1, Eth1/2
  Last clearing of "show interface" counters never
  9 interface resets
  Load-Interval #1: 30 seconds
    30 seconds input rate 824 bits/sec, 0 packets/sec
    30 seconds output rate 296 bits/sec, 0 packets/sec
    input rate 824 bps, 0 pps; output rate 296 bps, 0 pps
  Load-Interval #2: 5 minute (300 seconds)
    300 seconds input rate 536 bits/sec, 0 packets/sec
    300 seconds output rate 88 bits/sec, 0 packets/sec
    input rate 536 bps, 0 pps; output rate 88 bps, 0 pps
  RX
    0 unicast packets  2093 multicast packets  0 broadcast packets
    2093 input packets  171820 bytes
    0 jumbo packets  0 storm suppression bytes
    0 runts  0 giants  0 CRC  0 no buffer
    0 input error  0 short frame  0 overrun   0 underrun  0 ignored
    0 watchdog  0 bad etype drop  0 bad proto drop  0 if down drop
    0 input with dribble  0 input discard
    0 Rx pause
  TX
    0 unicast packets  409 multicast packets  0 broadcast packets
    409 output packets  59256 bytes
    0 jumbo packets
    0 output error  0 collision  0 deferred  0 late collision
    0 lost carrier  0 no carrier  0 babble  0 output discard
    0 Tx pause

このとき、suspend の状態で接続されている eth 1/2 の lacp status は 0x5 となっています。LACP state の詳細は、Nexus シリーズ : LACP Data Unit に記載しています。

Switch# show lacp interface e 1/2
Interface Ethernet1/2 is suspended
  Channel group is 1 port channel is Po1
  PDUs sent: 164
  PDUs rcvd: 163
  Markers sent: 0
  Markers rcvd: 0
  Marker response sent: 0
  Marker response rcvd: 0
  Unknown packets rcvd: 0
  Illegal packets rcvd: 0
Lag Id: [ [(8000, 0-be-75-18-f3-f7, 8000, 1, 105), (8000, 0-be-75-19-36-d7, 8000, 1, 105)] ]
Operational as aggregated link since Thu Dec 12 07:23:10 2019

Local Port: Eth1/2   MAC Address= 0-be-75-19-36-d7
  System Identifier=0x8000,  Port Identifier=0x1,0x105
  Operational key=32768
  LACP_Activity=active
  LACP_Timeout=Long Timeout (30s)
  Synchronization=NOT_IN_SYNC
  Collecting=false
  Distributing=false
  Partner information refresh timeout=Long Timeout (90s)
Actor Admin State=5
Actor Oper State=5
Neighbor: 0x105
  MAC Address= 0-be-75-18-f3-f7
  System Identifier=0x8000,  Port Identifier=0x1,0x105
  Operational key=32768
  LACP_Activity=unknown
  LACP_Timeout=Long Timeout (30s)
  Synchronization=NOT_IN_SYNC
  Collecting=false
  Distributing=false
Partner Admin State=5
Partner Oper State=5
Aggregate or Individual(True=1)= 2
Switch#
Switch# show lacp neighbor int po 1
Flags:  S - Device is sending Slow LACPDUs F - Device is sending Fast LACPDUs
        A - Device is in Active mode       P - Device is in Passive mode
port-channel1 neighbors
Partner's information
            Partner                Partner                     Partner
Port        System ID              Port Number     Age         Flags
Eth1/2      32768,0-be-75-18-f3-f7 0x105           477         SA

            LACP Partner           Partner                     Partner
            Port Priority          Oper Key                    Port State
            1                      0x8000                      0x5

eth1/1 の接続が再度確立されると、port-channel 1 は UP となります。

2019 Dec 12 07:34:59 Switch %ETHPORT-5-SPEED: Interface Ethernet1/1, operational speed changed to 10 Gbps
2019 Dec 12 07:34:59 Switch %ETHPORT-5-IF_DUPLEX: Interface Ethernet1/1, operational duplex mode changed to Full
2019 Dec 12 07:34:59 Switch %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet1/1, operational Receive Flow Control state changed to off
2019 Dec 12 07:34:59 Switch %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet1/1, operational Transmit Flow Control state changed to off
2019 Dec 12 07:35:02 Switch %ETH_PORT_CHANNEL-5-PORT_UP: port-channel1: Ethernet1/1 is up
2019 Dec 12 07:35:02 Switch %ETH_PORT_CHANNEL-5-FOP_CHANGED: port-channel1: first operational port changed from none to Ethernet1/1
2019 Dec 12 07:35:02 Switch %ETHPORT-5-IF_UP: Interface Ethernet1/1 is up in mode trunk
2019 Dec 12 07:35:02 Switch %ETHPORT-5-IF_UP: Interface port-channel1 is up in mode trunk
2019 Dec 12 07:35:05 Switch %ETH_PORT_CHANNEL-5-PORT_UP: port-channel1: Ethernet1/2 is up
2019 Dec 12 07:35:05 Switch %ETHPORT-5-IF_UP: Interface Ethernet1/2 is up in mode trunk

Switch# show int po 1
port-channel1 is up
admin state is up,
  Hardware: Port-Channel, address: 00be.7519.36d8 (bia 00be.7519.36d8)
  MTU 1500 bytes, BW 20000000 Kbit, DLY 10 usec
  reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, medium is broadcast
  Port mode is trunk
  full-duplex, 10 Gb/s
  Input flow-control is off, output flow-control is off
  Auto-mdix is turned off
  Switchport monitor is off
  EtherType is 0x8100
  Members in this channel: Eth1/1, Eth1/2
  Last clearing of "show interface" counters never
  10 interface resets
  Load-Interval #1: 30 seconds
    30 seconds input rate 1176 bits/sec, 0 packets/sec
    30 seconds output rate 1304 bits/sec, 0 packets/sec
    input rate 1.18 Kbps, 0 pps; output rate 1.30 Kbps, 0 pps
  Load-Interval #2: 5 minute (300 seconds)
    300 seconds input rate 96 bits/sec, 0 packets/sec
    300 seconds output rate 128 bits/sec, 0 packets/sec
    input rate 96 bps, 0 pps; output rate 128 bps, 0 pps
  RX
    0 unicast packets  2143 multicast packets  0 broadcast packets
    2143 input packets  178196 bytes
    0 jumbo packets  0 storm suppression bytes
    0 runts  0 giants  0 CRC  0 no buffer
    0 input error  0 short frame  0 overrun   0 underrun  0 ignored
    0 watchdog  0 bad etype drop  0 bad proto drop  0 if down drop
    0 input with dribble  0 input discard
    0 Rx pause
  TX
    0 unicast packets  445 multicast packets  0 broadcast packets
    445 output packets  64516 bytes
    0 jumbo packets
    0 output error  0 collision  0 deferred  0 late collision
    0 lost carrier  0 no carrier  0 babble  0 output discard
    0 Tx pause

Switch# show port-channel sum
Flags:  D - Down        P - Up in port-channel (members)
        I - Individual  H - Hot-standby (LACP only)
        s - Suspended   r - Module-removed
        b - BFD Session Wait
        S - Switched    R - Routed
        U - Up (port-channel)
        p - Up in delay-lacp mode (member)
        M - Not in use. Min-links not met
--------------------------------------------------------------------------------
Group Port-       Type     Protocol  Member Ports
      Channel
--------------------------------------------------------------------------------
1     Po1(SU)     Eth      LACP      Eth1/1(P)    Eth1/2(P)

 

 

関連コンテンツ

Nexus シリーズ : Nexus シリーズ : Link Aggregation Control Protocol (LACP) の設定例

Nexus シリーズ : LACP Data Unit

Nexus シリーズ : LACP suspend-individual

Nexus スイッチ (NX-OS) : 設定例

 

 

参考情報

Cisco Nexus 9000 Series NX-OS Interfaces Configuration Guide, Release 9.3(x)

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