[c-nsp] ASR 9000 Series MPLS Label Limits

[James Bensley]

Just to close this up for anyone else with the same query;

If we look at the output below from an example ASR9001 there is 99,625
MPLS labels in LFIB. One can see that roughly double the number of
TCAM entries are used (196,055). The TCAM also shows 2M
entries/records as the maximum number of entries possible. Each label
is using 2 records in TCAM (the "records" are joint ingress and egress
labels) so it can effectively hold 1M labels entries in the 2M TCAM
records. A few extra entries inside the LFIB and TCAM are used for
some internal "stuff" so the number show as used in TCAM isn't exactly
double the number of labels in the LFIB.

Cheers,
James.



RP/0/RSP0/CPU0:abr1#show mpls forwarding summary
Forwarding entries:
   Label switching: 99625, protected: 0
…



RP/0/RSP0/CPU0:abr1#show controllers np struct Label-UFIB summary
                Node: 0/0/CPU0:
----------------------------------------------------------------
NP: 0  Struct 28: MPLS_LEAF

Struct is a PHYSICAL entity

Reserved Entries: 0, Used Entries: 196055, Max Entries: 2097152