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+.. SPDX-License-Identifier: GPL-2.0
+
+====================
+MPLS Sysfs variables
+====================
+
+/proc/sys/net/mpls/* Variables:
+===============================
+
+platform_labels - INTEGER
+ Number of entries in the platform label table. It is not
+ possible to configure forwarding for label values equal to or
+ greater than the number of platform labels.
+
+ A dense utilization of the entries in the platform label table
+ is possible and expected as the platform labels are locally
+ allocated.
+
+ If the number of platform label table entries is set to 0 no
+ label will be recognized by the kernel and mpls forwarding
+ will be disabled.
+
+ Reducing this value will remove all label routing entries that
+ no longer fit in the table.
+
+ Possible values: 0 - 1048575
+
+ Default: 0
+
+ip_ttl_propagate - BOOL
+ Control whether TTL is propagated from the IPv4/IPv6 header to
+ the MPLS header on imposing labels and propagated from the
+ MPLS header to the IPv4/IPv6 header on popping the last label.
+
+ If disabled, the MPLS transport network will appear as a
+ single hop to transit traffic.
+
+ * 0 - disabled / RFC 3443 [Short] Pipe Model
+ * 1 - enabled / RFC 3443 Uniform Model (default)
+
+default_ttl - INTEGER
+ Default TTL value to use for MPLS packets where it cannot be
+ propagated from an IP header, either because one isn't present
+ or ip_ttl_propagate has been disabled.
+
+ Possible values: 1 - 255
+
+ Default: 255
+
+conf/<interface>/input - BOOL
+ Control whether packets can be input on this interface.
+
+ If disabled, packets will be discarded without further
+ processing.
+
+ * 0 - disabled (default)
+ * not 0 - enabled