IT 끄적이는 물고기

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

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#