MPLS and RSVP-TE
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MPLS Guide
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3HE 18686 AAAB TQZZA
Table 4 lists the label ranges available for use by egress labels (push labels).
3.2.3 MPLS Entropy Labels
This section contains information on the following topics:
• Overview of Entropy Labels
• Inserting and Processing the Entropy Label
• Entropy Label on OAM Packets
• Segment Routing Entropy Label and IPSec, ESPI Hashing, and NGE
• Entropy Label Configuration
3.2.3.1 Overview of Entropy Labels
The 7705 SAR supports MPLS entropy labels on RSVP-TE and SR-TE LSPs, as per
RFC 6790. The entropy label provides greater granularity for load balancing on an
LSR where load balancing is typically based on the MPLS label stack.
The ability of a node to receive and process an entropy label for an LSP is signaled
using capability signaling (referred to as entropy label capability (ELC)). Entropy
labels are supported on RSVP-TE and SR-TE tunnels.
Inserting an entropy label adds two labels in the MPLS label stack: the entropy label
itself and the entropy label indicator (ELI).
The entropy label is inserted directly below the tunnel label and closest to the service
payload that has advertised entropy label capability (which may be above the bottom
of the stack). The value of the entropy label is calculated at the iLER and is based on
a hash of the packet payload header content and other system parameters at
ingress. For more information on hashing inputs, see the “Per-Flow Hashing” section
in the 7705 SAR Interface Configuration Guide.
Table 4 Egress Label Values (Push Labels)
Label Values Description
16 through 1 048 575 Can be used for static LSP tunnel and static PW labels
16 through 1 048 575 Can be dynamically assigned for both MPLS tunnel labels
and PW labels
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