MPLS Guide MPLS and RSVP-TE
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Notes:
1. On the SR segment because the SR head end injects the entropy label.
2. For services that support entropy label.
3.2.3.2 Inserting and Processing the Entropy Label
This section contains inserting and processing information on the following node
types:
• Ingress LER
• LSR
• Egress LER
3.2.3.2.1 Ingress LER
The procedures at the iLER are as specified in section 4.2 of RFC 6790. In general,
the router inserts an entropy label into the label stack if the downstream node for the
LSP tunnel has signaled support for entropy label and the entropy label is enabled
for the particular service.
RFC 6790 specifies that the iLER can insert several entropy labels in the label stack
where the LSP hierarchy exists, one for each LSP in the hierarchy. However, this
could result in unreasonably large label stacks. Therefore, when there are multiple
LSPs in a hierarchy (for example, LDP over RSVP-TE), the router only inserts a
single EL/ELI pair within the innermost LSP label closest to the service payload that
has advertised entropy label capability.
EVPN VPLS Yes Yes
EVPN Epipe Yes Yes
R-VPLS Yes Yes
IGP shortcut Yes No
SR FRR over TI-LFA or R-LFA N/A Yes
Static route with tunnel next hop Yes Yes
Table 5 Summary of Entropy Label Support (Continued)
Service RSVP-TE SR-TE
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