The router supports the MPLS entropy label on SR-TE LSPs as described in RFC 6790. LSR nodes in a network can load balance labeled packets more granularly than by hashing on the standard label stack. See the 7450 ESS, 7750 SR, 7950 XRS, and VSR MPLS Guide for more information.
Announcing the Entropy Label Capability (ELC) is supported by the OSPF or IS-IS routing protocol. However, processing the ELC signaling is not supported for OSPF or IS-IS segment-routed tunnels.
If the path of the SR-TE LSP is computed by the local CSPF or IP-to-label translation, the head-end router assumes ELC if either the configure router isis entropy-label entropy-label-capability or configure router ospf entropy-label entropy-label-capability is configured. However, this case requires that the far-end node SID of the LSP is advertised within the same domain as the head-end. This allows the head-end router to know the association between the far-end IP address and the SID of the node below which to insert the entropy label.
for SR-TE LSPs where the primary or secondary path hops consist of static SID labels
This is configured under the configure>router>mpls>path>hop context.
In this case, use the configure router mpls lsp override-tunnel-elc command to configure the ELC.
when the PCE provides the ERO
This applies to PCC-initiated SR-TE LSPs with path-computation-method pce, PCE-initiated SR-TE LSPs, or on-demand SR-TE auto-LSPs. In these cases, use the configure router mpls lsp override-tunnel-elc command to configure the ELC.