doc: add 'mpls label dynamic-block' information

Add information on the 'mpls label dynamic-block' command. Signed-off-by: Philippe Guibert <[email protected]>
FRRouting · Oct 3, 2023 · 853d042 · 853d042
1 parent d225cdc
commit 853d042
Showing 1 changed file with 19 additions and 0 deletions.
diff --git a/doc/user/zebra.rst b/doc/user/zebra.rst
@@ -783,6 +783,18 @@ presence of the entry.
    21     Static       10.125.0.2  IPv4 Explicit Null
 
 
+MPLS label chunks
+-----------------
+
+MPLS label chunks are handled in the zebra label manager service,
+which ensures a same label value or label chunk can not be used by
+multiple CP routing daemons at the same time.
+
+Label requests originate from CP routing daemons, and are resolved
+over the default MPLS range (16-1048575). Hardset label requests
+are label requests that request an exact label value, whereas
+dynamic label requests only need a range of label values.
+
 Allocated label chunks table can be dumped using the command
 
 .. clicmd:: show debugging label-table
@@ -796,6 +808,13 @@ Allocated label chunks table can be dumped using the command
    Proto ospf: [20000/21000]
    Proto isis: [22000/23000]
 
+.. clicmd:: mpls label dynamic-block (16-1048575)
+
+   Define a range of labels where dynamic label requests will
+   allocate label chunks from. This command guarantees that
+   hardset label values outside that range will not conflict
+   with the dynamic label requests.
+
 .. _zebra-srv6:
 
 Segment-Routing IPv6