path: root/Documentation/networking
diff options
authorEric W. Biederman <>2015-03-03 19:11:20 -0600
committerDavid S. Miller <>2015-03-04 00:26:06 -0500
commit7720c01f3f590116882e251f13c7e1d5602f8643 (patch)
treeb27e3e1b2443de3b68e4dfcf1a12e7d4e5b11198 /Documentation/networking
parent0189197f441602acdca3f97750d392a895b778fd (diff)
mpls: Add a sysctl to control the size of the mpls label table
This sysctl gives two benefits. By defaulting the table size to 0 mpls even when compiled in and enabled defaults to not forwarding any packets. This prevents unpleasant surprises for users. The other benefit is that as mpls labels are allocated locally a dense table a small dense label table may be used which saves memory and is extremely simple and efficient to implement. This sysctl allows userspace to choose the restrictions on the label table size userspace applications need to cope with. Signed-off-by: "Eric W. Biederman" <> Signed-off-by: David S. Miller <>
Diffstat (limited to 'Documentation/networking')
1 files changed, 20 insertions, 0 deletions
diff --git a/Documentation/networking/mpls-sysctl.txt b/Documentation/networking/mpls-sysctl.txt
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+++ b/Documentation/networking/mpls-sysctl.txt
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+/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 utliziation of the entries in the platform label table
+ is possible and expected aas 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