Reserved Label Blocks

Reserved label blocks are used to reserve a set of labels for allocation for various applications. These reserved label blocks are separate from the existing ranges such as the static-labels-range, and are not tied to the bottom of the labels range. For example, a reserved range may be used as a Segment Routing Local Block (SRLB) for local segment identifiers (SIDs). Ranges are reserved from the dynamic label range and up to four reserved label block ranges may be configured on a system.

A reserved label block is configured using the following:

config
   router
      mpls-labels
         reserved-label-block <name> 
            start <start-value> end <end-value>
            exit
         no reserved-label-block <name

A range can be configured up to the maximum supported MPLS label value on the system.