01/06/2020 08:05:29 AM

Bài viết sưu tầm

LLDP là gì?

Sau đây, là phần tóm tắt một số ý chính về phần LLDP (SV cố gắng dich các thuật ngữ tiếng anh phổ biến liên quan môn học)

LLDP

The Cisco Discovery Protocol (CDP) is a device discovery protocol that runs over Layer 2 (the data link layer) on all Cisco-manufactured devices (routers, bridges, access servers, and switches). CDP allows network management applications to automatically discover and learn about other Cisco devices connected to the network.

To support non-Cisco devices and to allow for interoperability between other devices, the switch supports the IEEE 802.1AB Link Layer Discovery Protocol (LLDP). LLDP is a neighbor discovery protocol that is used for network devices to advertise information about themselves to other devices on the network. This protocol runs over the data-link layer, which allows two systems running different network layer protocols to learn about each other.

LLDP supports a set of attributes that it uses to discover neighbor devices. These attributes contain type, length, and value descriptions and are referred to as TLVs. LLDP supported devices can use TLVs to receive and send information to their neighbors. This protocol can advertise details such as configuration information, device capabilities, and device identity.

The switch supports these basic management TLVs. These are mandatory LLDP TLVs.

Port description TLV

System name TLV

System description TLV

System capabilities TLV

Management address TLV

These organizationally specific LLDP TLVs are also advertised to support LLDP-MED.

Port VLAN ID TLV ((IEEE 802.1 organizationally specific TLVs)

MAC/PHY configuration/status TLV(IEEE 802.3 organizationally specific TLVs)

This example shows how to globally enable LLDP.

Switch# configure terminal

Switch(config)# lldp run