[Network] CISCO - EtherChannel 설정

 

 

 

 

 

 

 

EtherChannel 이란 ?

 

• EtherChannel를 사용하면 여러 물리적 이더넷 링크를 하나의 논리적 채널로 결합하는 기술입니다.
• EtherChannel를 통해 데이터 트래픽 로드를 공유할 수 있습니다.
• EtherChannel를 사용하여 하나 이상의 링크에 장애가 발생할 경우 이중화가 가능합니다.
• EtherChannel을 사용하여 UTP(Unshielded Twisted Pair) 와이어링 또는 단일 모드 및 다중 모드 파이버를 통해 LAN 스위치, 라우터, 서버 및 클라이언트를 연결할 수 있습니다.
• 단일 용어인 EtherChannel을 사용하는 Fast EtherChannel, Gigabit EtherChannel, Port Channel, Channel Group 및 Port Group을 가리킵니다.이 문서의 정보는 이러한 모든 EtherChannel과 같은 기술입니다.

 

 

요구사항

 

EtherChannel을 사용하기전에 해당 스위치와 포트가 지원이 되는지 확인해야합니다.

Switch# show interfaces Gi2/0/23 capabilities GigabitEthernet2/0/23
Model: WS-C3750G-24T
Type: 10/100/1000BaseTX
Speed: 10,100,1000,auto
Duplex: half,full,auto
Trunk encap. type: 802.1Q,ISL
Trunk mode: on,off,desirable,nonegotiate
Channel: yes
Broadcast suppression: percentage(0-100)
Flowcontrol: rx-(off,on,desired),tx-(none)
Fast Start: yes
QoS scheduling: rx-(not configurable on per port basis),tx-(4q2t)
CoS rewrite: yes ToS rewrite: yes
UDLD: yes Inline power: no
SPAN: source/destination
PortSecure: yes
Dot1x: yes
Switch#

 

 

 

 

EtherChannel 협상 프로토콜 종류

 

• PAgP (Cisco 장비만 사용가능)
• LACP (IEEE 802.3ad = 모든 장비 사용가능)

 

 

 

EtherChannel 협상 모드

 

모드	협상 프로토콜	내용
on	None (둘다)	EtherChannel을 항상 활성화합니다. Workstation/Server에서 협상 프로토콜을 지원하지 않는 경우 권장합니다.
off	None (둘다)	EtherChannel을 항상 비활성화합니다.
active	LACP	LACP 패킷을 전송하여 협상을 시작합니다. Workstation/Server가 LACP를 지원하는 경우 권장됩니다.
passive	LACP	연결된 Peer 장비가 LACP 패킷을 전송하면 협상이 시작됩니다.
desirable	PAgP	PAgP 패킷을 전송하여 협상을 시작합니다. Workstation/Server가 PAgP를 지원하는 경우 권장됩니다.
auto	PAgP	연결된 Peer 장비가 PAgP 패킷을 전송하면 협상이 시작됩니다.

서버와 클라이언트 설정과 맞추면서 NIC 어댑터에서 지원하는 협상 프로토콜에 따라 적절한 모드를 사용합니다.

 

 

 

EtherChannel 설정 (L2)

 

SW1

# EtherChannel 생성
SW1(config)# interface range ethernet 1/2-3
SW1(config-if-range)# switchport
SW1(config-if-range)# switchport mode trunk
W1(config-if-range)# channel-group 1 mode ?
active Enable LACP unconditionally
auto Enable PAgP only if a PAgP device is detected
desirable Enable PAgP unconditionally
on Enable Etherchannel only
passive Enable LACP only if a LACP device is detected

SW1(config-if-range)# channel-group 1 mode active
Creating a port-channel interface Port-channel 1

SW1(config-if-range)# no shutdown

# Port-Channel 설정
SW1(config)# interface port-channel 1
SW1(config-if)# switchport 
SW1(config-if)# switchport mode trunk
SW1(config-if)# no shutdown

 

 

SW2

# EtherChannel 생성
SW2(config)# interface range eth1/2-3
SW2(config-if-range)# switchport
SW2(config-if-range)# switchport mode trunk
SW2(config-if-range)# channel-group 1 mode active
Creating a port-channel interface Port-channel 1

SW2(config-if-range)# no shutdown

# Port-Channel 설정
SW2(config)# interface port-channel 1 
SW2(config-if)# switchport 
SW2(config-if)# switchport mode trunk
SW2(config-if)# no shutdown

 

 

 

EtherChannel 상태 확인

SW1

SW1# show interfaces po1
Port-channel1 is up, line protocol is up (connected) 
  Hardware is EtherChannel, address is aabb.cc00.1031 (bia aabb.cc00.1031)
  MTU 1500 bytes, BW 20000 Kbit/sec, DLY 1000 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, Auto-speed, media type is RJ45
  input flow-control is off, output flow-control is unsupported 
  Members in this channel: Et1/2 Et1/3 
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles 
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     966 packets output, 77372 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
SW1#

SW1#  show etherchannel  summary  
Flags:  D - down        P - bundled in port-channel
        I - stand-alone s - suspended
        H - Hot-standby (LACP only)
        R - Layer3      S - Layer2
        U - in use      N - not in use, no aggregation
        f - failed to allocate aggregator

        M - not in use, minimum links not met
        m - not in use, port not aggregated due to minimum links not met
        u - unsuitable for bundling
        w - waiting to be aggregated
        d - default port

        A - formed by Auto LAG


Number of channel-groups in use: 1
Number of aggregators:           1

Group  Port-channel  Protocol    Ports
------+-------------+-----------+-----------------------------------------------
1      Po1(SU)         LACP      Et1/2(P)    Et1/3(P)    

SW1#

 

SW2

SW2# show interfaces po1
Port-channel1 is up, line protocol is up (connected) 
  Hardware is EtherChannel, address is aabb.cc00.2021 (bia aabb.cc00.2021)
  MTU 1500 bytes, BW 20000 Kbit/sec, DLY 1000 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, Auto-speed, media type is RJ45
  input flow-control is off, output flow-control is unsupported 
  Members in this channel: Et1/2 Et1/3 
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     820 packets input, 47560 bytes, 0 no buffer
     Received 820 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles 
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     148 packets output, 24112 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
SW2#

SW2#  show etherchannel summary 
Flags:  D - down        P - bundled in port-channel
        I - stand-alone s - suspended
        H - Hot-standby (LACP only)
        R - Layer3      S - Layer2
        U - in use      N - not in use, no aggregation
        f - failed to allocate aggregator

        M - not in use, minimum links not met
        m - not in use, port not aggregated due to minimum links not met
        u - unsuitable for bundling
        w - waiting to be aggregated
        d - default port

        A - formed by Auto LAG


Number of channel-groups in use: 1
Number of aggregators:           1

Group  Port-channel  Protocol    Ports
------+-------------+-----------+-----------------------------------------------
1      Po1(SU)         LACP      Et1/2(P)    Et1/3(P)    

SW2#