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CHAPTER 5: SERIAL PORT, HOST DEVICE AND USER CONFIG
The common settings (baud rate etc.) are used when configuring the ports, but some operations (for example, sending serial
breaks) may not work depending on the implementation of the underlying USB serial chip.
5.1.10 LINK LAYER DISCOVERY PROTOCOL (LLDP)
The Link Layer Discovery Protocol (LLDP) is a protocol that allows system administrators to glean information about devices
physically connected to managed switches. It is available for use on LES1700, LES1516A, LES1532A, LES1548A and LES1600
devices.
The LLDP service is enabled through the System > Services page. When the service is enabled, the lldpd daemon is loaded and
runs. The Service Access tab controls which network interfaces are monitored by the lldpd daemon.
When LLDP is granted access to an interface, it will use that interface even if the interface has been disabled via System > IP.
LLDP neighbors are visible through the Status > LLDP Neighbors page. This page shows neighbors heard, and also indicates the
information that the console manager is sending.
NOTE: Although the LLDP service can be granted access to non-Ethernet interfaces (for example, G3, G4 and PSTN dial-up
interfaces), it currently ignores non-Ethernet interfaces.
The lldpcli shell client interacts with and configures the running LLDP service.
Persistent custom configuration changes can be added to the system through configuration files placed in /etc/config/lldpd.d/.
Custom configuration files—which must have filenames ending with .conf—will be read and executed by lldpcli when the LLDP
service starts.
The /etc/ directory is read-only on Black Box hardware. Most default configuration files otherwise stored in /etc/ are, on Black Box
hardware, in /etc/config/, which is writeable.
The default lldpd configuration file—lldpd.conf—is stored in /etc/config/ on Black Box hardware. It is not safe as a store of custom
configuration details. There are circumstances in which this file is regenerated automatically, in which case all customizations will
be lost.
The etc/config/lldpd.d/ directory, which is also writable and which is created on first boot, is safe to write to. Any Custom LLDP
configurations must be stored as *.conf files in this directory.
When enabled, LLDP frames issued by an Black Box Console Manager will reveal sensitive information such as hostname, and
firmware version.
LLDP frames are not passed through by 802.3ab compliant switches, and Black Box Console Managers have the LLDP service
disabled by default.
Both lldpd and lldpcli have standard man pages but, because of space concerns, these pages are not shipped with Black Box
hardware.
Both man pages are available on the lldpd project web-site, but: man lldpd is at https://vincentbernat.github.io/lldpd/usage.
html#lldpd8; and man lldpcli is at https://vincentbernat.github.io/lldpd/usage.html#lldpcli8.
NOTE: Black Box uses lldpd 0.9.2.
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