网络工程师Day10 以太网接口和链路配置

学习目标

掌握接口速率的配置方法

掌握使用手动模式配置链路聚合的方法

掌握使用静态ＬＡＣＰ模式配置链路聚合的方法

掌握在静态LACP模式下配置接口优先级的方法

需要了解

随着网络规模的不断扩大，用户对骨干链路的带宽和可靠性提出了越来越高的要求，在传统技术中，常用更换高速率的接口板或更换支持高速率接口板的设备的方式来增加带宽，但这种方案需要付出高额的费用，而且不够灵活

采用链路聚合技术可以在不进行硬件升级的条件下，通过将多个物理接口捆绑为一个逻辑接口，来达到增加链路带宽的目的。在实现增大带宽目的的同时，链路聚合采用备份链路的机制，可以有效的提高设备之间链路的可靠性。

链路聚合一般部署在核心结点，以便提升整个网络的数据吞吐量。

链路聚合能够提高链路带宽，增强网络可用性，支持负载分担。

链路聚合模式分为
手工负载均衡模式
LACP(link AGGREGATION CONTROL PROTOCOL)模式

手工负载分担模式下所有接口都参与数据的转发，分担负载流量

LACP模式支持链路备份

一个快速以太口（FE口）和一个千兆以太口（GE口）不能加入同一个ETH-TRUNK，如果将两个不同类型的接口加入到同一个ETH-TRUNK口，设备会提示发生错误。

只有LACP模式支持备份成员链路，如需要建立备份链路，应使用LACP模式的链路聚合。

如果要在路由器上配置三层链路聚合，需要首先创建ETH-TRUNK接口，然后在ET-TRUNK逻辑口上执行undo portswitch 命令，把聚合链路从二层转为三层链路，执行undo poerswitch 命令后，可以为ETH-TRUNK逻辑口分配一个IP地址

拓扑图

场景

现在公司购买了两台华为的S5700系列的交换机，为了提高交换机之间链路带宽以及可靠性，需要在交换机上配置链路聚合功能

操作步骤

步骤一以太网交换机基础配置

修改接口的速率之前先关闭接口的自协调功能，然后将0/0/9和0/0/10接口的速率配置为100mbit/s

int g0/0/9
undo negotiation auto
speed 100

但是进行验证时没有显示其速率。

[s1]dis int g0/0/9
GigabitEthernet0/0/9 current state : UP
Line protocol current state : UP
Description:
Switch Port, PVID :1, TPID : 8100(Hex), The Maximum Frame Length is 9216
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 4c1f-cc1e-5b60
Last physical up time   : 2019-08-28 23:46:08 UTC-08:00
Last physical down time : 2019-08-28 23:46:07 UTC-08:00
Current system time: 2019-08-28 23:49:21-08:00
Hardware address is 4c1f-cc1e-5b60
Last 300 seconds input rate 0 bytes/sec, 0 packets/sec
Last 300 seconds output rate 0 bytes/sec, 0 packets/sec
Input: 357 bytes, 3 packets
Output: 10948 bytes, 92 packets
Input:Unicast: 0 packets, Multicast: 3 packetsBroadcast: 0 packets
Output:Unicast: 0 packets, Multicast: 92 packetsBroadcast: 0 packets
Input bandwidth utilization  :    0%
Output bandwidth utilization :    0%

步骤二配置手动模式的链路聚合

在S1和S2上创建ETH-TRUNK 1,然后将G0/0/9和G0/0/10接口加入Eth-trunk 1 （注意：将接口加入ETH-TRUNK 前需要确认成员接口没有任何配置）

[s1]int Eth-Trunk 1
[s1-Eth-Trunk1]quit
[s1]int g0/0/9
[s1-GigabitEthernet0/0/9]eth
[s1-GigabitEthernet0/0/9]eth-trunk 1
Info: This operation may take a few seconds. Please wait for a moment...done.
[s1-GigabitEthernet0/0/9]quit
[s1]int g0/0/10
[s1-GigabitEthernet0/0/10]eth-reh
[s1-GigabitEthernet0/0/10]eth-
[s1-GigabitEthernet0/0/10]eth-trunk 1
Info: This operation may take a few seconds. Please wait for a moment...done.
[s1-GigabitEthernet0/0/10]quit

S2做相同配置

然后查看S1的配置

[s1]dis eth-trunk 1
Eth-Trunk1's state information is:
WorkingMode: NORMAL Hash arithmetic: According to SIP-XOR-DIP
Least Active-linknumber: 1  Max Bandwidth-affected-linknumber: 8
Operate status: up  Number Of Up Port In Trunk: 2
--------------------------------------------------------------------------------
PortName  Status  Weight
GigabitEthernet0/0/9  Up  1
GigabitEthernet0/0/10 Up  1

步骤三配置静态LACP模式的链路聚合

删除S1和S2上的0/0/9和0/0/10 接口下的配置

[s1]int g0/0/9
[s1-GigabitEthernet0/0/9]undo et
[s1-GigabitEthernet0/0/9]undo eth-trunk
Info: This operation may take a few seconds. Please wait for a moment...done.
[s1-GigabitEthernet0/0/9]int g0/0/10
[s1-GigabitEthernet0/0/10]undo et
[s1-GigabitEthernet0/0/10]undo eth-trunk
Info: This operation may take a few seconds. Please wait for a moment...done.
[s1-GigabitEthernet0/0/10]quit

S2做相同的配置

创建ETH-TRUNK 1 并配置该ETH-TRUNK为静态LACP模式，然后将G0/0/9和G 0/0/10接口加入ETH-TRUNK 1

[s1]INT Eth-Trunk 1[s1-Eth-Trunk1]mode lacp-static [s1-Eth-Trunk1]quit
[s1]int g0/0/9[s1-GigabitEthernet0/0/9]eth-trunk 1
Info: This operation may take a few seconds. Please wait for a moment...done.
[s1-GigabitEthernet0/0/9]int g0/0/10[s1-GigabitEthernet0/0/10]eth-trunk 1
Info: This operation may take a few seconds. Please wait for a moment...done.

S2做相同的配置

查看交换机上ETH-TRUNK的信息，查看链路是否协调成功

[s1]dis eth-trunk 1
Eth-Trunk1's state information is:
Local:
LAG ID: 1   WorkingMode: STATIC
Preempt Delay: Disabled Hash arithmetic: According to SIP-XOR-DIP
System Priority: 32768  System ID: 4c1f-cc1e-5b60
Least Active-linknumber: 1  Max Active-linknumber: 8
Operate status: up  Number Of Up Port In Trunk: 2
--------------------------------------------------------------------------------
ActorPortName  Status   PortType PortPri PortNo PortKey PortState Weight
GigabitEthernet0/0/9   Selected 1GE  32768   10 305 10111100  1
GigabitEthernet0/0/10  Selected 1GE  32768   11 305 10111100  1 Partner:
--------------------------------------------------------------------------------
ActorPortName  SysPri   SystemIDPortPri PortNo PortKey PortState
GigabitEthernet0/0/9   327684c1f-cca0-2a34  32768   10 305 10111100
GigabitEthernet0/0/10  327684c1f-cca0-2a34  32768   11 305 10111100

在S1上配置LACP的系统优先级为100，使其成为LACP主动端

[s1]lacp priority 100

配置接口的优先级确定活动链路

[s1]int g0/0/9
[s1-GigabitEthernet0/0/9]lacp
[s1-GigabitEthernet0/0/9]lacp pri
[s1-GigabitEthernet0/0/9]lacp priority 100
[s1-GigabitEthernet0/0/9]int g0/0/10
[s1-GigabitEthernet0/0/10]lacp pri
[s1-GigabitEthernet0/0/10]lacp priority 100

验证ETH-TRUNK的配置结果

[s1]dis eth-trunk 1
Eth-Trunk1's state information is:
Local:
LAG ID: 1   WorkingMode: STATIC
Preempt Delay: Disabled Hash arithmetic: According to SIP-XOR-DIP
System Priority: 100System ID: 4c1f-cc1e-5b60
Least Active-linknumber: 1  Max Active-linknumber: 8
Operate status: up  Number Of Up Port In Trunk: 2
--------------------------------------------------------------------------------
ActorPortName  Status   PortType PortPri PortNo PortKey PortState Weight
GigabitEthernet0/0/9   Selected 1GE  100 10 305 10111100  1
GigabitEthernet0/0/10  Selected 1GE  100 11 305 10111100  1     Partner:
--------------------------------------------------------------------------------
ActorPortName  SysPri   SystemIDPortPri PortNo PortKey PortState
GigabitEthernet0/0/9   327684c1f-cca0-2a34  32768   10 305 10111100
GigabitEthernet0/0/10  327684c1f-cca0-2a34  32768   11 305 10111100

  [s2]dis eth-trunk 1
Eth-Trunk1's state information is:
Local:
LAG ID: 1   WorkingMode: STATIC
Preempt Delay: Disabled Hash arithmetic: According to SIP-XOR-DIP
System Priority: 32768  System ID: 4c1f-cca0-2a34
Least Active-linknumber: 1  Max Active-linknumber: 8
Operate status: up  Number Of Up Port In Trunk: 2
--------------------------------------------------------------------------------
ActorPortName  Status   PortType PortPri PortNo PortKey PortState Weight
GigabitEthernet0/0/9   Selected 1GE  32768   10 305 10111100  1
GigabitEthernet0/0/10  Selected 1GE  32768   11 305 10111100  1 Partner:
--------------------------------------------------------------------------------
ActorPortName  SysPri   SystemIDPortPri PortNo PortKey PortState
GigabitEthernet0/0/9   100  4c1f-cc1e-5b60  100 10 305 10111100
GigabitEthernet0/0/10  100  4c1f-cc1e-5b60  100 11 305 10111100