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-rw-r--r--man/systemd.network.xml28
1 files changed, 18 insertions, 10 deletions
diff --git a/man/systemd.network.xml b/man/systemd.network.xml
index 6d45d6c807..70e3804746 100644
--- a/man/systemd.network.xml
+++ b/man/systemd.network.xml
@@ -363,18 +363,26 @@
<varlistentry>
<term><varname>EmitLLDP=</varname></term>
<listitem>
- <para>Controls support for Ethernet LLDP packet emission. Accepts a boolean parameter and defaults to
- false. If enabled a short LLDP packet with information about the local system is sent out in regular
- intervals on the link. The LLDP packet will contain information about the local host name, the local
- machine ID (as stored in
- <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>) and the
+ <para>Controls support for Ethernet LLDP packet emission. Accepts a boolean parameter or the special values
+ <literal>nearest-bridge</literal>, <literal>non-tpmr-bridge</literal> and
+ <literal>customer-bridge</literal>. Defaults to false, which turns off LLDP packet emission. If not false,
+ a short LLDP packet with information about the local system is sent out in regular intervals on the
+ link. The LLDP packet will contain information about the local host name, the local machine ID (as stored
+ in <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>) and the
local interface name, as well as the pretty hostname of the system (as set in
<citerefentry><refentrytitle>machine-info</refentrytitle><manvolnum>5</manvolnum></citerefentry>). LLDP
- emission is only available on Ethernet links. Note that this setting passed data suitable for
- identification of host to the network and should thus not be used on untrusted networks, where such
- identification data should not be made available. Use this option to enable other systems to identify on
- which interface they are connected to this system. See <varname>LLDP=</varname> above for an option to
- enable LLDP reception.</para>
+ emission is only available on Ethernet links. Note that this setting passes data suitable for
+ identification of host to the network and should thus not be enabled on untrusted networks, where such
+ identification data should not be made available. Use this option to permit other systems to identify on
+ which interfaces they are connected to this system. The three special values control propagation of the
+ LLDP packets. The <literal>nearest-bridge</literal> setting permits propagation only to the nearest
+ connected bridge, <literal>non-tpmr-bridge</literal> permits propagation across Two-Port MAC Relays, but
+ not any other bridges, and <literal>customer-bridge</literal> permits propagation until a customer bridge
+ is reached. For details about these concepts, see <ulink
+ url="http://standards.ieee.org/getieee802/download/802.1AB-2009.pdf">IEEE 802.1AB-2009</ulink>. Note that
+ configuring this setting to true is equivalent to <literal>nearest-bridge</literal>, the recommended and
+ most restricted level of propagation. See <varname>LLDP=</varname> above for an option to enable LLDP
+ reception.</para>
</listitem>
</varlistentry>
<varlistentry>