Managing Network Discovery And Lldp; Configuring Lldp - Siemens RX1500 User Manual

RUGGEDCOM ROX II
User Guide
Section 5.36

Managing Network Discovery and LLDP

ROX II supports the Link Layer Discovery Protocol (LLDP), a Layer 2 protocol for automated network discovery.
LLDP is an IEEE standard protocol, IEEE 802.11AB, which allows a networked device to advertise its own basic
networking capabilities and configuration. It can simplify the troubleshooting of complex networks and can be
used by Network Management Systems (NMS) to obtain and monitor detailed information about a network's
topology. LLDP data are made available via SNMP (through support of LLDP-MIB).
LLDP allows a networked device to discover its neighbors across connected network links using a standard
mechanism. Devices that support LLDP are able to advertise information about themselves, including their
capabilities, configuration, interconnections, and identifying information.
LLDP agent operation is typically implemented as two modules: the LLDP transmit module and LLDP receive
module. The LLDP transmit module, when enabled, sends the local device's information at regular intervals,
in 802.1AB standard format. Whenever the transmit module is disabled, it transmits an LLDPDU (LLDP data
unit) with a time-to-live (TTL) TLV containing 0 in the information field. This enables remote devices to remove
the information associated with the local device in their databases. The LLDP receive module, when enabled,
receives information about remote devices and updates its LLDP database of remote systems. When new or
updated information is received, the receive module initiates a timer for the valid duration indicated by the TTL
TLV in the received LLDPDU. A remote system's information is removed from the database when an LLDPDU is
received from it with TTL TLV containing 0 in its information field.
CAUTION!
Security hazard – risk of unauthorized access and/or exploitation. LLDP is not secure by definition.
Avoid enabling LLDP on devices connected to external networks. Siemens recommends using LLDP
only in secure environments operating within a security perimeter.
NOTE
LLDP is implemented to keep a record of only one device per Ethernet port. Therefore, if there are
multiple devices sending LLDP information to a switch port on which LLDP is enabled, information
about the neighbor on that port will change constantly.
The following sections describe how to configure and manage LLDP:
• Section 5.36.1, "Configuring LLDP"
• Section 5.36.2, "Viewing Global Statistics and Advertised System Information"
• Section 5.36.3, "Viewing Statistics for LLDP Neighbors"
• Section 5.36.4, "Viewing Statistics for LLDP Ports"
Section 5.36.1

Configuring LLDP

To configure the Link Layer Discovery Protocol (LLDP), do the following:
1. Change the mode to Edit Private or Edit Exclusive.
2. Navigate to switch » net-discovery » lldp. The LLDP form appears.
Managing Network Discovery and LLDP
Chapter 5
Setup and Configuration
749