HCNA-18 Eth-Trunk链路聚合
HCNA-18 Eth-Trunk链路聚合按目前的链路连接方式，交换机到交换机之间的主干线路默认的STP生成树一定会只保留一条，其余两条线丢弃阻塞！display stp brief MSTID Port RoleSTP State Protection 0 GigabitEthernet0/0/1 DESIFORWARDING NONE 0 GigabitEthernet0/0/22 ROOTFORWARDING NONE 0 GigabitEthernet0/0/23 ALTEDISCARDING NONE 0 GigabitEthernet0/0/24 ALTEDISCARDING NONE查看S2的生成树摘要信息，GE 0/0/23和GE 0/0/24的STP状态都是丢弃，干线只有GE0/0/22是转发。下面配置Eth-Trunk链路，增加S1到S2之间的带宽实现冗余链路！interface Eth-Trunk1//创建Eth-Trunk 1接口mode manualload-balance//配置手工负载均衡模式interfaceGigabitEthernet 0/0/22eth-trunk1//接口加入到eth-trunk 1中quitinterfaceGigabitEthernet 0/0/23eth-trunk1quit interface Eth-Trunk 1mode manualload-balanceinterfaceGigabitEthernet 0/0/22eth-trunk1quitinterfaceGigabitEthernet 0/0/23eth-trunk1quit display eth-trunk //查看链路聚合Eth-Trunk1's stateinformation is:WorkingMode: NORMAL Hash arithmetic: According toSIP-XOR-DIP Least Active-linknumber:1Max Bandwidth-affected-linknumber:8 Operate status: up Number Of Up Port In Trunk: 2 --------------------------------------------------------------------------------PortName Status Weight GigabitEthernet0/0/22 Up 1 GigabitEthernet0/0/23 Up 1 查看到GE0/0/22和GE 0/0/23已经加入到Eth-Trunk1中，并且处于UP状态。NORMAL为正常模式（手工负载均衡）display interfaceEth-Trunk 1//查看Eth-Trunk 1接口信息Eth-Trunk1 current state :UPLine protocol current state: UPDescription:Switch Port, PVID : 1, Hash arithmetic : According toSIP-XOR-DIP,Maximal BW: 2G, Current BW: 2G, The Maximum Frame Length is 9216IP Sending Frames' Format isPKTFMT_ETHNT_2, Hardware address is 4c1f-cc81-4bf4Current system time:2020-05-16 18:49:28-08:00 Input bandwidth utilization: 0% Output bandwidth utilization : 0%-----------------------------------------------------PortName Status Weight-----------------------------------------------------GigabitEthernet0/0/22 UP 1GigabitEthernet0/0/23 UP 1-----------------------------------------------------The Number of Ports in Trunk: 2The Number of UP Ports inTrunk : 2查看到当前带宽为2G，GE 0/0/22+GE 0/0/23之和。此时再看STP状态display stp brief MSTID Port RoleSTP State Protection 0 GigabitEthernet0/0/1 DESIFORWARDING NONE 0 GigabitEthernet0/0/24 DESIFORWARDING NONE 0 Eth-Trunk1 DESIFORWARDING NONEdisplay stp brief MSTID Port RoleSTP State Protection 0 GigabitEthernet0/0/1 DESIFORWARDING NONE 0 GigabitEthernet0/0/24 ALTE DISCARDING NONE 0 Eth-Trunk1 ROOT FORWARDING NONE目前的结果是S1和S2的GE 0/0/22和GE0/0/23的接口被捆绑成一个Eth-Trunk接口，并且处理转发状态。配置LACP模式Eth-Trunk目前22+23接口组成的eth-trunk 1若其中一条链路出现故障，只有一条线路正常工作则无法保障带宽，现将三条链路进行捆绑，并采用LACP模式配置，实现两条链路同时转发数据，另一条链路作为备份链路，若其中一条出现故障则第三条备份链路实现立即代替转发。interface Eth-Trunk 1modelacp-static//配置模式为静态LACPError: Error in changingtrunk working mode. There is(are) port(s) in the trunk.发现报错，无法更改模式，注意！需要先删除加入了eth-trunk 1中的接口后再更改。interfaceGigabitEthernet 0/0/22undoeth-trunk//接口不加入eth-trunkquitinterfaceGigabitEthernet 0/0/23undoeth-trunkquitinterface Eth-Trunk 1modelacp-static//配置模式为静态LACPquitinterfaceGigabitEthernet 0/0/22eth-trunk1quitinterfaceGigabitEthernet 0/0/23eth-trunk1quitinterfaceGigabitEthernet 0/0/24eth-trunk1quit interfaceGigabitEthernet 0/0/22undoeth-trunkquitinterfaceGigabitEthernet 0/0/23undoeth-trunkquitinterface Eth-Trunk 1modelacp-staticquitinterfaceGigabitEthernet 0/0/22eth-trunk1quitinterfaceGigabitEthernet 0/0/23eth-trunk1quitinterfaceGigabitEthernet 0/0/24eth-trunk1quit更改好模式，并把接口加入Eth-Trunk 1后查看Eth-Trunk 1接口状态。display eth-trunk 1Eth-Trunk1's stateinformation is:Local:LAG ID: 1 WorkingMode: STATIC Preempt Delay: Disabled Hash arithmetic: According toSIP-XOR-DIP System Priority: 32768 System ID: 4c1f-cc81-4bf4 Least Active-linknumber:1Max Active-linknumber: 8 Operate status: up Number Of Up Port In Trunk: 3 --------------------------------------------------------------------------------ActorPortName Status PortType PortPri PortNo PortKey PortStateWeightGigabitEthernet0/0/22Selected1GE 32768 23 305 101111001 GigabitEthernet0/0/23Selected1GE 32768 24 305 101111001 GigabitEthernet0/0/24Selected1GE 32768 25 305 101111001 Partner:--------------------------------------------------------------------------------ActorPortName SysPri SystemID PortPri PortNo PortKey PortStateGigabitEthernet0/0/2232768 4c1f-ccde-37a232768 23 305 10111100GigabitEthernet0/0/2332768 4c1f-ccde-37a232768 24 305 10111100GigabitEthernet0/0/2432768 4c1f-ccde-37a232768 25 305 10111100可以看到三条链路全部是活动的(Selected)下面把S1 SystemPriority系统优先级改成100，让其成为主动端，注意值越小，优先级越高。当配置完成主动端后，两端交换机会比较优先级从而选出主动端交换机，并且两端的Eth-Trunk链路会一致选择与主动端一样的端口转发数据。lacp priority 100display eth-trunk 1Eth-Trunk1's stateinformation is:Local:LAG ID: 1 WorkingMode: STATIC Preempt Delay: Disabled Hash arithmetic: According toSIP-XOR-DIP System Priority: 100 System ID: 4c1f-cc81-4bf4 Least Active-linknumber:1Max Active-linknumber: 8 Operate status: up Number Of Up Port In Trunk: 3 --------------------------------------------------------------------------------ActorPortName Status PortType PortPri PortNo PortKey PortStateWeightGigabitEthernet0/0/22Selected1GE 32768 23 305 101111001 GigabitEthernet0/0/23Selected1GE 32768 24 305 101111001 GigabitEthernet0/0/24Selected1GE 32768 25 305 101111001 ……此时由于没有配置Eth-Trunk接口上限阈值，所以仍是显示三个接口都为活动状态；下面配置上限阈值。interface Eth-Trunk 1maxactive-linknumber 2//配置最大活动链路数为2quitdisplay eth-trunk 1Eth-Trunk1's stateinformation is:Local:LAG ID: 1 WorkingMode: STATIC Preempt Delay: Disabled Hash arithmetic: According toSIP-XOR-DIP System Priority: 100 System ID: 4c1f-cc81-4bf4 Least Active-linknumber:1Max Active-linknumber: 2 Operate status: up Number Of Up Port In Trunk: 2 --------------------------------------------------------------------------------ActorPortName Status PortType PortPri PortNo PortKey PortState WeightGigabitEthernet0/0/22Selected1GE 32768 23 305 101111001 GigabitEthernet0/0/23Selected1GE 32768 24 305 101111001 GigabitEthernet0/0/24Unselect1GE 32768 25 305 101000001……系统自动选举出了22和23接口成为活动链路下面通过配置LACP接口优先级来手动设定活动链路23和24interfaceGigabitEthernet 0/0/23lacppriority 100//配置接口LACP优先级为100quitinterfaceGigabitEthernet 0/0/24lacppriority 100quitinterface Eth-Trunk 1shutdownundo shutdownquitdisplay eth-trunk 1Eth-Trunk1's stateinformation is:Local:LAG ID: 1 WorkingMode: STATIC Preempt Delay: Disabled Hash arithmetic: According toSIP-XOR-DIP System Priority: 100 System ID: 4c1f-cc81-4bf4 Least Active-linknumber:1Max Active-linknumber: 2 Operate status: up Number Of Up Port In Trunk: 2 --------------------------------------------------------------------------------ActorPortName Status PortType PortPri PortNo PortKey PortState WeightGigabitEthernet0/0/22Unselect 1GE 3276823 305 10100000 1 GigabitEthernet0/0/23Selected1GE 100 24 305 101111001 GigabitEthernet0/0/24Selected1GE 100 25 305 101111001 …… display eth-trunk 1Eth-Trunk1's stateinformation is:Local:LAG ID: 1 WorkingMode: STATIC Preempt Delay: Disabled Hash arithmetic: According toSIP-XOR-DIP System Priority: 32768 System ID: 4c1f-ccde-37a2 Least Active-linknumber:1Max Active-linknumber: 8 Operate status: up Number Of Up Port In Trunk: 2 --------------------------------------------------------------------------------ActorPortName Status PortType PortPri PortNo PortKey PortStateWeightGigabitEthernet0/0/22Unselect 1GE 3276823 305 10110000 1 GigabitEthernet0/0/23Selected1GE 32768 24 305 101111001 GigabitEthernet0/0/24Selected1GE 32768 25 305 101111001 ……此时S1和S2的Eth-Trunk 1活动链路成功选择为23和24注意配置最大阈值和LACP接口优先级时，只需要在配置的主动端交换机上配置即可。
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