User's Manual
Table Of Contents
- Chapter 1 INTRODUCTION
- Chapter 2 INSTALLATION
- Chapter 3 witch Management
- Chapter 4 Basic Switch Configuration
- Chapter 5 File System Operations
- Chapter 6 Cluster Configuration
- Chapter 7 USB Function Configuration
- Chapter 8 Device Management
- Chapter 9 Port Configuration
- Chapter 10 Port Isolation Function Configuration
- Chapter 11 Port Loopback Detection Function Configuration
- Chapter 12 ULDP Function Configuration
- Chapter 13 LLDP Function Operation Configuration
- Chapter 14 Port Channel Configuration
- Chapter 15 MTU Configuration
- Chapter 16 bpdu-tunnel-protocol Configuration
- Chapter 17 DDM Configuration
- Chapter 18 EFM OAM Configuration
- Chapter 19 LLDP-MED
- Chapter 20 PORT SECURITY
- Chapter 21 QSFP+ Port Split and Combination Configuration
- Chapter 22 VLAN Configuration
- Chapter 23 MAC Table Configuration
- Chapter 24 MSTP Configuration
- Chapter 25 QoS Configuration
- Chapter 26 PBR Configuration
- Chapter 27 IPv6 PBR Configuration
- Chapter 28 Flow-based Redirection
- Chapter 29 Egress QoS Configuration
- Chapter 30 Flexible QinQ Configuration
- Chapter 31 Layer 3 Management Configuration
- Chapter 32 ARP Scanning Prevention Function Configuration
- Chapter 33 Prevent ARP, ND Spoofing Configuration
- Chapter 34 ARP GUARD Configuration
- Chapter 35 Gratuitous ARP Configuration
- Chapter 36 DHCP Configuration
- Chapter 37 DHCPv6 Configuration
- Chapter 38 DHCP option 82 Configuration
- Chapter 39 DHCPv6 option37, 38
- Chapter 40 DHCP Snooping Configuration
- Chapter 41 DHCP option 60 and option 43
- Chapter 42 IPv4 Multicast Protocol
- Chapter 43 IPv6 Multicast Protocol
- Chapter 44 Multicast VLAN
- Chapter 45 ACL Configuration
- Chapter 46 Self-defined ACL Configuration
- Chapter 47 802.1x Configuration
- 47.1 Introduction to 802.1x
- 47.2 802.1x Configuration Task List
- 47.3 802.1x Application Example
- 47.4 802.1x Troubleshooting
- Chapter 48 The Number Limitation Function of MAC and IP in Port, VLAN Configuration
- 48.1 Introduction to the Number Limitation Function of MAC and IP in Port, VLAN
- 48.2 The Number Limitation Function of MAC and IP in Port, VLAN Configuration Task Sequence
- 48.3 The Number Limitation Function of MAC and IP in Port, VLAN Typical Examples
- 48.4 The Number Limitation Function of MAC and IP in Port, VLAN Troubleshooting Help
- Chapter 49 Operational Configuration of AM Function
- Chapter 50 Security Feature Configuration
- 50.1 Introduction to Security Feature
- 50.2 Security Feature Configuration
- 50.2.1 Prevent IP Spoofing Function Configuration Task Sequence
- 50.2.2 Prevent TCP Unauthorized Label Attack Function Configuration Task Sequence
- 50.2.3 Anti Port Cheat Function Configuration Task Sequence
- 50.2.4 Prevent TCP Fragment Attack Function Configuration Task Sequence
- 50.2.5 Prevent ICMP Fragment Attack Function Configuration Task Sequence
- 50.3 Security Feature Example
- Chapter 51 TACACS+ Configuration
- Chapter 52 RADIUS Configuration
- Chapter 53 SSL Configuration
- Chapter 54 IPv6 Security RA Configuration
- Chapter 55 VLAN-ACL Configuration
- Chapter 56 MAB Configuration
- Chapter 57 PPPoE Intermediate Agent Configuration
- Chapter 58 SAVI Configuration
- Chapter 59 Captive Portal Authentication
- 59.1 Captive Portal Authentication Configuration
- 59.2 Accounting Function Configuration
- 59.3 Free-resource Configuration
- 59.4 Authentication White-list Configuration
- 59.5 Automatic Page Pushing after Successful Authentication (it is not supported currently)
- 59.6 http-redirect-filter
- 59.7 Portal Non-perception
- 59.8 Portal Escaping
- Chapter 60 VRRP Configuration
- Chapter 61 IPv6 VRRPv3 Configuration
- Chapter 62 MRPP Configuration
- Chapter 63 ULPP Configuration
- Chapter 64 ULSM Configuration
- Chapter 65 Mirror Configuration
- Chapter 66 RSPAN Configuration
- Chapter 67 SNTP Configuration
- Chapter 68 NTP Function Configuration
- Chapter 69 DNSv4/v6 Configuration
- Chapter 70 Summer Time Configuration
- Chapter 71 Monitor and Debug
- Chapter 72 Reload Switch after Specified Time
- Chapter 73 Debugging and Diagnosis for Packets Received and Sent by CPU
- Chapter 74 VSF
- Chapter 75 SWITCH OPERATION
- Chapter 76 TROUBLESHOOTING
- Chapter 77 APPENDIX A
- Chapter 78 GLOSSARY
Configuration Guide of XGS-5240-Series
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Chapter 13 LLDP Function Operation
Configuration
13.1 Introduction to LLDP Function
Link Layer Discovery Protocol (LLDP) is a new protocol defined in 802.1ab. It enables
neighbor devices to send notices of their own state to other devices, and enables all ports of
every device to store information about them. If necessary, the ports can also send update
information to the neighbor devices directly connected to them, and those neighbor devices
will store the information in standard SNMP MIBs. The network management system can
check the layer-two connection state from MIB. LLDP won’t configure or control network
elements or flows, but only report the configuration of layer-two. Another content of 802.1ab is
to utilizing the information provided by LLDP to find the conflicts in layer-two. IEEE now uses
the existing physical topology, interfaces and Entity MIBs of IETF.
To simplify, LLDP is a neighbor discovery protocol. It defines a standard method for
Ethernet devices, such as switches, routers and WLAN access points, to enable them to notify
their existence to other nodes in the network and store the discovery information of all
neighbor devices. For example, the detail information of the device configuration and
discovery can both use this protocol to advertise.
In specific, LLDP defines a general advertisement information set, a transportation
advertisement protocol and a method to store the received advertisement information. The
device to advertise its own information can put multiple pieces of advertisement information in
one LAN data packet to transport. The type of transportation is the type length value (TLV) field.
All devices supporting LLDP have to support device ID and port ID advertisement, but it is
assumed that, most devices should also support system name, system description and system
performance advertisement. System name and system description advertisement can also
provide useful information for collecting network flow data. System description advertisement
can include data such as the full name of the advertising device, hardware type of system, the
version information of software operation system and so on.
802.1AB Link Layer Discovery Protocol will make searching the problems in an enterprise
network an easier process and can strengthen the ability of network management tools to
discover and maintain accurate network topology structure.
Many kinds of network management software use “Automated Discovery” function to
trace the change and condition of topology, but most of them can reach layer-three and
classify the devices into all IP subnets at best. This kind of data are very primitive, only