3.14 L2 Etherchannel基本配置
实验目的:
1、掌握L2 Etherchannle的基本配置。
2、理解Etherchannel的协商协议。
实验拓扑:
实验步骤:
1、依据图中拓扑,在SW1和SW2上部署L2 Etherchannel,实现链路捆绑并提供链路带宽,可以通过三种方式部署,如下:
①强制方式:直接绑定,无需任何协商。
②Pagp方式:通过Cisco私有协议Pagp进行协商。
③Lacp方式:通过行业标准协议Lacp进行协商。
2、依据强制方式部署L2 Etherchannel,配置如下:
SW1上
SW1(config)#int range f0/1 - 2
SW1(config-if-range)#switchport trunk encapsulation dot1q
SW1(config-if-range)#switchport mode trunk
SW1(config-if-range)#channel-group 1 mode on[PL1]
SW1(config-if-range)#exit
SW2上
SW2(config)#int range f0/1 - 2
SW2(config-if-range)#switchport trunk encapsulation dot1q
SW2(config-if-range)#switchport mode trunk
SW2(config-if-range)#channel-group 1 mode on
SW2(config-if-range)#exit
此时查看以太通道信息,如下:
SW1#show etherchannel summary
Flags: D - down P - 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
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) - Fa0/1(P) Fa0/2(P)
此时以太通道已经成功建立,查看以太通道物理信息,如下:
SW1#show interfaces port-channel 1
Port-channel1 is up, line protocol is up
Hardware is EtherChannel, address is cc03.0a28.f000 (bia cc03.0a28.f000)
MTU 1500 bytes, BW 200000 Kbit, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s
Members in this channel: Fa0/0 Fa0/1
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:01, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (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 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
可以看到以太通道的带宽为200M。
3、采用Pagp方式进行协商绑定,配置如下:
SW1上
SW1(config)#int range f0/1 �C 2
SW1(config-if-range)#switchport trunk encapsulation dot1q
SW1(config-if-range)#switchport mode trunk
SW1(config-if-range)#channel-protocol pagp[PL2]
SW1(config-if-range)#channel-group 1 mode desirable[PL3]
SW2上
SW2(config)#int range f0/1 �C 2
SW2(config-if-range)#switchport trunk encapsulation dot1q
SW2(config-if-range)#switchport mode trunk
SW2(config-if-range)#channel-protocol pagp
SW2(config-if-range)#channel-group 1 mode auto
查看以太通道状态,如下:
SW1#show etherchannel summary
Flags: D - down P - 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
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) PAgP Fa0/1(P) Fa0/2(P)
可以看到,通过PagP协议实现了L2 Etherchannel的捆绑,同样也可以采用Lacp实现,此处略过。此实验完成。
[PL1]将F0/1和F0/2放入group1,其中group为本地标识,用于区分本地多个捆绑组。
[PL2]可以采用PAGP或者LACP协议。
[PL3]PAGP有desirable和auto模式,LACP有active和passive模式。
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