一、好處
- 提升頻寬 Bandwidth
- 備援線路 Redundancy
二、作法
將SW1的port1-2和SW2的port1-2作Etherchannel
(一)Static On Mode
1.關閉 SW1的port1-2和SW2的port1-2
- SW1(config)# interface range gi1/0/1-2
- SW1(config)# shutdown
- SW2(config)# interface range gi1/0/1-2
- SW2(config)# shutdown
2.將 port1-2 分別放入Channel-Group
- SW1(config)# interface range gi1/0/1-2
- SW1(config)# channel-group 1 mode on
- Creating a port-channel interface Port-channel 1
- SW2(config)# interface range gi1/0/1-2
- SW2(config)#channel-group 1 mode on
- Creating a port-channel interface Port-channel 1
3.開啟 SW1的port1-2和SW2的port1-2
- SW1(config)# interface range gi1/0/1-2
- SW1(config)# no shutdown
- SW2(config)# interface range gi1/0/1-2
- SW2(config)# no shutdown
4.觀察 Etherchannel 運作
- 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 f - failed to allocate aggregator
M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) - Gi1/0/1(P) Gi1/0/2(P)
5.顯示port-channel 1 介面
- SW1# show interface port-channel 1
Port-channel1 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 64d8.14c0.f009 (bia 64d8.14c0.f009)
MTU 1500 bytes, BW 2000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
(二)PAgP-- Port Aggregation Protocol(Cisco)
除第2步驟不同,必須兩個Switch至少有一方為 desireable,其餘步驟與前述方法相同。
2.將 port1-2 分別放入Channel-Group
- SW1(config)# interface range gi1/0/1-2
- SW1(config)# channel-group 1 mode desireable
- Creating a port-channel interface Port-channel 1
- SW2(config)# interface range gi1/0/1-2
- SW2(config)#channel-group 1 mode auto
- Creating a port-channel interface Port-channel 1
(三)LACP--Ling Aggregation Control Protocol(IEEE 802.3ad)
除第2步驟不同,必須兩個Switch一方為 active,一方為passive,其餘步驟與前述方法相同。
2.將 port1-2 分別放入Channel-Group
- SW1(config)# interface range gi1/0/1-2
- SW1(config)# channel-group 1 mode active
- Creating a port-channel interface Port-channel 1
- SW2(config)# interface range gi1/0/1-2
- SW2(config)#channel-group 1 mode passive
- Creating a port-channel interface Port-channel 1
三、參考資料:
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