MPLS and RSVP-TE
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MPLS Guide
© 2022 Nokia.
Use subject to Terms available at: www.nokia.com
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The entropy-label command under the config>router>mpls and
config>router>mpls>lsp contexts provides local control at the head end of an LSP
over whether the entropy label is inserted on an LSP by overriding the entropy label
capability signaled from the far-end LER, and control over how the additional label
stack depth is accounted for. This allows the user to avoid entropy label insertion
where there is a risk of the label stack depth becoming too great.
For entropy labels that are supported on LDP tunnels with remote-LFA protection
(that is, for rsvp-shortcut), only loop-free alternate protect (lfa-protect) and LFA
(lfa-only) are allowed.
Support of entropy labels over RSVP-TE and SR-TE tunnels are the only valid
options, except when the 7705 SAR is the LER node with BGP labeled unicast (BGP-
LU) tunnels. A 7705 SAR in an LER role can push and pop an entropy label for Epipe
and VPLS services with a BGP-LU tunnel riding over an RSVP-TE LSP. Conversely,
a 7705 SAR does not support being in an ABR or ASBR role with BGP-LU. Table 5
lists entropy label support on the 7705 SAR.
Table 5 Summary of Entropy Label Support
Service RSVP-TE SR-TE
Epipe Yes Yes
Ipipe Yes Yes
Cpipe Yes Yes
Apipe, Fpipe, Hpipe No No
VPRN (MP-BGP) Yes Yes
VPRN (Layer 3 spoke SDP) Yes Yes
IES (Layer 3 spoke SDP) Yes Yes
VPLS SDP (spoke/mesh SDP) Yes Yes
LDP over IGP shortcut (RSVP) Yes N/A
IGP shortcut (SR) N/A No
LDP FRR over RSVP Yes N/A
LDP stitching over SR (SR to LDP) N/A
Yes
1
LDP stitching over SR (LDP to SR) No No
BGP LU
Yes
2
Yes
2
SR No Yes
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