链路聚合技术

H3C

link-aggregation load-sharing mode { { destination-ip | destination-port | ip-protocol | source-ip | source-port }

二、 实验

Cisco私有的PAgP的链路聚合协议配置（PT模拟2层）

1. 实验拓扑

说明：

默认情况下，交换机会使用STP协议阻塞其中某个端口，因为上面的网络存在环路。

使用PAgP链路聚合充分利用冗余的链路带宽

2. 配置

Switch>en Switch#conf t

Switch(config)#hostname SW0 SW0(config)#int ra fa 0/1-2 SW0(config-if-range)#no sh

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SW0(config-if-range)#switchport SW0(config-if-range)#channel-protocol lacp Prepare interface for LACP protocol pagp Prepare interface for PAgP protocol SW0(config-if-range)#channel-protocol pagp SW0(config-if-range)#channel-group <1-48> Channel group number

SW0(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

SW0(config-if-range)#channel-group 1 mode desirable //主动进入协商状态

Switch>en Switch#conf t

Switch(config)#hostname SW1 SW1(config)#int ra fa 0/1-2 SW1 (config-if-range)#no sh SW1 (config-if-range)#switchport

SW1 (config-if-range)#channel-protocol pagp

SW1 (config-if-range)#channel-group 1 mode auto //被动进入协商模式 Switch(config-if-range)#

%LINK-5-CHANGED: Interface Port-channel 1, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel 1, changed state to up

Switch(config-if-range)#

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3. 验证

查看聚合组信息

SW0(config-if-range)#do show etherchannel port-channel Channel-group listing: ---------------------- Group: 1 ----------

Port-channels in the group: ---------------------------

Port-channel: Po1 ------------

Age of the Port-channel = 00d:00h:01m:56s Logical slot/port = 2/1 Number of ports = 2 GC = 0x00000000 HotStandBy port = null Port state = Port-channel Protocol = PAGP Port Security = Disabled

Ports in the Port-channel:

Index Load Port EC state No of bits ------+------+------+------------------+----------- 0 00 Fa0/1 Desirable-Sl 0

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0 00 Fa0/2 Desirable-Sl 0

Time since last port bundled: 00d:00h:01m:05s Fa0/2 SW0(config-if-range)#

查看聚合链路的汇总信息

SW0(config-if-range)#do show etherchannel summary Flags: D - down P - in port-channel I - stand-alone s - suspended H - Hot-standby (LACP only) R - Layer3 S - Layer2 //二层

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) SW0(config-if-range)#

4. 测试容错性

配置SW0和SW1的VLAN 1 的IP地址，测试聚合链路的容错 SW0(config-if-range)#int vlan 1

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SW0(config-if)#no shutdown

SW0(config-if)#ip add 192.168.1.1 255.255.255.0 SW0(config-if)#

SW1(config-if-range)#int vlan 1 SW1(config-if)#no sh

SW1(config-if)#ip add 192.168.1.2 255.255.255.0 SW1(config-if)#

测试聚合端口的冗余容错特性

在SW0上向SW1持续发送ICMP数据包 SW0(config-if)#do ping Protocol [ip]: ip

Target IP address: 192.168.1.2 Repeat count [5]: 10000 Datagram size [100]: 100 Timeout in seconds [2]: 2 Extended commands [n]: n Sweep range of sizes [n]: n Type escape sequence to abort.

Sending 10000, 100-byte ICMP Echos to 192.168.1.2, timeout is 2 seconds: !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

然后在SW1上将聚合组中的fa 0/2关掉，观察ping数据包是否中断 SW1(config)#int fa 0/2 SW1(config-if)#no sh SW1(config-if)#no shutdown

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