PingingLab传世经典系列《CCNA完全配置宝典》-3.14 L2 Etherchannel基本配置

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 - 2SW1(config-if-range)#switchport trunk encapsulation dot1qSW1(config-if-range)#switchport mode trunkSW1(config-if-range)#channel-group 1 mode on[PL1]SW1(config-if-range)#exitSW2上SW2(config)#int range f0/1 - 2SW2(config-if-range)#switchport trunk encapsulation dot1qSW2(config-if-range)#switchport mode trunkSW2(config-if-range)#channel-group 1 mode onSW2(config-if-range)#exit此时查看以太通道信息，如下：SW1#show etherchannel summaryFlags: 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 aggregatedd - default portNumber of channel-groups in use: 1Number of aggregators: 1Group 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 1Port-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 – 2SW1(config-if-range)#switchport trunk encapsulation dot1qSW1(config-if-range)#switchport mode trunkSW1(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 – 2SW2(config-if-range)#switchport trunk encapsulation dot1qSW2(config-if-range)#switchport mode trunkSW2(config-if-range)#channel-protocol pagpSW2(config-if-range)#channel-group 1 mode auto查看以太通道状态，如下：SW1#show etherchannel summaryFlags: 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 portNumber of channel-groups in use: 1Number of aggregators: 1Group 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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