【转】【菜鸟IT大讲堂】配置LLDP链路层发现协议

温馨提示：欢迎对技术感兴趣的新手朋友们，希望这些知识点能对大家有帮助。如果有什么不解或疑惑或建议，可留言小编或邮件[e-mail]，我将尽快给予解决。感谢大家的支持和关注，谢谢！！！

实验目的

1、了解链路层发现协议LLDP的运行原理

2、掌握链路层发现协议LLDP的配置方法

实验拓扑

实验需求

1、根据实验拓扑图，完成设备的基本配置；

2、在R1上使用LLDP查看SW1和R2的设备信息；

3、注意：LLDP默认关闭，需要手工打开。

实验步骤

步骤1：设备的基本配置

配置R1：

Router>enable

Router#configure terminal

Router(config)#hostname R1

R1(config)#no ip domain-lookup

R1(config)#line console 0

R1(config-line)#exec-timeout 0 0

R1(config-line)#logging synchronous

R1(config-line)#exit

R1(config)#interface ethernet0/0

R1(config-if)#ip address 192.168.1.254 255.255.255.0

R1(config-if)#no shutdown

R1(config-if)#exit

R1(config)#interface ethernet0/1

R1(config-if)#ip address 192.168.12.1 255.255.255.0

R1(config-if)#no shutdown

R1(config-if)#end

R1#

配置R2：

Router>enable

Router#configure terminal

Router(config)#hostname R2

R2(config)#no ip domain-lookup

R2(config)#line console 0

R2(config-line)#exec-timeout 0 0

R2(config-line)#logging synchronous

R2(config-line)#exit

R2(config)#interface ethernet0/0

R2(config-if)#ip address 192.168.12.2 255.255.255.0

R2(config-if)#no shutdown

R2(config-if)#end

R2#

配置SW1：

Switch>enable

Switch#configure terminal

Switch(config)#hostname SW1

SW1(config)#no ip domain-lookup

SW1(config)#line console 0

SW1(config-line)#exec-timeout 0 0

SW1(config-line)#logging synchronous

SW1(config-line)#exit

SW1(config)#interface vlan 1

SW1(config-if)#ip address 192.168.1.1 255.255.255.0

SW1(config-if)#no shutdown

SW1(config-if)#exit

SW1(config)#ip default-gateway 192.168.1.254

SW1(config)#end

SW1#

步骤2：配置LLDP

配置R1：

R1>enable

R1#configure terminal

R1(config)#lldp run //运行LLDP

配置R2：

R2>enable

R2#configure terminal

R2(config)#lldp run

配置SW1：

SW1>enable

SW1#configure terminal

SW1(config)#lldp run

步骤1：检查设备的接口状态

检查R1：

R1#show ip interface brief

Interface IP-Address OK? Method Status Protocol

Ethernet0/0 192.168.1.254 YES manual up up

Ethernet0/1 192.168.12.1 YES manual up up

Ethernet0/2 unassigned YES unset administratively down down

Ethernet0/3 unassigned YES unset administratively down down

R1使用到的接口已经配置好IP地址，并且是up up状态。

检查R2：

R2#show ip interface brief

Interface IP-Address OK? Method Status Protocol

Ethernet0/0 192.168.12.2 YES manual up up

Ethernet0/1 unassigned YES TFTP administratively down down

Ethernet0/2 unassigned YES unset administratively down down

Ethernet0/3 unassigned YES unset administratively down down

R2使用到的接口已经配置好IP地址，并且是up up状态。

检查SW1：

SW1#show ip interface brief

Interface IP-Address OK? Method Status Protocol

Ethernet0/0 unassigned YES unset up up

Ethernet0/1 unassigned YES unset up up

Ethernet0/2 unassigned YES unset up up

Ethernet0/3 unassigned YES unset up up

Vlan1 192.168.1.1 YES manual up up

SW1使用到的接口已经配置好IP地址，并且是up up状态。

步骤2：使用LLDP查看物理相连的设备信息

检查R1上运行LLDP的接口:

R1#show lldp interface

Ethernet0/0:

Tx: enabled

Rx: enabled

Tx state: IDLE

Rx state: WAIT FOR FRAME

Ethernet0/1:

Tx: enabled

Rx: enabled

Tx state: IDLE

Rx state: WAIT FOR FRAME

Ethernet0/2:

Tx: enabled

Rx: enabled

Tx state: INIT

Rx state: WAIT PORT OPER

Ethernet0/3:

Tx: enabled

Rx: enabled

Tx state: INIT

--More--

R1的E0/0和E0/1接口已经运行LLDP。

• 检查R1上的LLDP邻居:

R1#show lldp neighbors

Capability codes:

(R) Router, (B) Bridge, (T) Telephone, (C) DOCSIS Cable Device

(W) WLAN Access Point, (P) Repeater, (S) Station, (O) Other

Device ID Local Intf Hold-time Capability Port ID

SW1 Et0/0 120 R Et0/0

R2 Et0/1 120 R Et0/0

Total entries displayed: 2

R1上能够看到SW1和R2两个LLDP邻居。

检查R1上的LLDP条目:

R1#show lldp entry *

Capability codes:

(R) Router, (B) Bridge, (T) Telephone, (C) DOCSIS Cable Device

(W) WLAN Access Point, (P) Repeater, (S) Station, (O) Other

---

Local Intf: Et0/0 //R1本端的接口

Chassis id: aabb.cc00.3000

Port id: Et0/0 //对端的接口

Port Description: Ethernet0/0

System Name: SW1 //对端设备的主机名

System Description:

Cisco IOS Software, Linux Software (I86BI_LINUXL2-ADVENTERPRISEK9-M), Version 15.2(CML_NIGHTLY_20190423)FLO_DSGS7, EARLY DEPLOYMENT DEVELOPMENT BUILD, synced to V152_6_0_81_E

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2019 by

Time remaining: 103 seconds

System Capabilities: B,R

Enabled Capabilities: R

Management Addresses:

IP: 192.168.1.1 //SW1的IP地址

Auto Negotiation - not supported

Physical media capabilities - not advertised

Media Attachment Unit type - not advertised

Vlan ID: - not advertised

---

Local Intf: Et0/1

Chassis id: aabb.cc00.2000

Port id: Et0/0

Port Description: Ethernet0/0

System Name: R2

System Description:

Cisco IOS Software, Linux Software (I86BI_LINUX-ADVENTERPRISEK9-M), Version 15.7(3)M2, DEVELOPMENT TEST SOFTWARE

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2018 by Cisco Systems, Inc.

Compiled Wed 28-Mar-18 11:18 by prod_rel_te

Time remaining: 98 seconds

System Capabilities: B,R

Enabled Capabilities: R

Management Addresses:

IP: 192.168.12.2

Auto Negotiation - not supported

Physical media capabilities - not advertised

Media Attachment Unit type - not advertised

Vlan ID: - not advertised

Total entries displayed: 2

R1有两个CDP邻居，分别是SW1和R2。

原文来自：微思网络
原文地址：https://mp.weixin.qq.com/s/eQ...