Nokia 7705 SAR-W Series Manual page 30

MPLS and RSVP-TE
The entropy label functionality is not available on first generation (Gen-1) adapter
cards.
The router inserts an entropy label on a tunnel that is entropy label-capable when the
service has entropy label enabled, even if an implicit or explicit NULL label has been
signaled by the downstream LSR or LER. This ensures consistent behavior and
ensures that the entropy label value as determined by the iLER is maintained where
a tunnel with an implicit NULL label is stitched at a downstream LSR.
3.2.3.2.2
If an LSR is configured for load balancing and an entropy label is found in the label
stack, the LSR will take the entropy label into account in the hashing algorithm as
follows:
The entropy label functionality is not available on first generation (Gen-1) adapter
cards.
If penultimate hop popping (PHP) has been requested by a next-hop LER, the LSR
will retain any entropy label found immediately below the tunnel label that is to be
popped. The system will retain and use the entropy label information as input to the
local hash routine if an applicable LSR load-balancing mode has been configured.
For more information on LSR load balancing, see the "LSR Hashing" section in the
7705 SAR Interface Configuration Guide.
3.2.3.2.3
At an eLER, if an ELI and entropy label are detected in the label stack, both the ELI
and entropy label are popped and the packet processed as normal. This occurs
whether or not the system has signaled entropy label capability.
If an ELI is popped that has the bottom of stack (BoS) bit set, the system will discard
the packet.
30
LSR
• label-only: the entropy label is used as input to the hash routine and the rest of
the label stack is ignored.
• label-ip: the entropy label and the IP packet are used as input to the hash
routine and the rest of the label stack is ignored.
Egress LER
Use subject to Terms available at: www.nokia.com
© 2022 Nokia.
MPLS Guide
3HE 18686 AAAB TQZZA