what's the meaning of "72 bits (IPv4, MPLS, EoM)" in "show platform hardware capacity"?

Answered Question
Jan 12th, 2010

hi all,

i wonder what is the meaning of 72bits in show platform hardware capacity

PE007#show platform hardware capacity
System Resources
  PFC operating mode: PFC3B
  Supervisor redundancy mode: administratively sso, operationally sso
  Switching resources: Module   Part number               Series      CEF mode
                       1        7600-SIP-400              CEF256           CEF
                       2        WS-X6748-GE-TX            CEF720           CEF
                       5        WS-SUP720-3B          supervisor           CEF
                       6        WS-SUP720-3B          supervisor           CEF

     ------------------- omited  -----------------------------

L2 Forwarding Resources
           MAC Table usage:   Module  Collisions  Total       Used       %Used
                              5                0  65536         16          1%
                              6                0  65536         16          1%

             VPN CAM usage:                       Total       Used       %Used
                                                    512          8          2%
L3 Forwarding Resources
             FIB TCAM usage:                     Total        Used       %Used
                  72 bits (IPv4, MPLS, EoM)     196608      196280        100%
                 144 bits (IP mcast, IPv6)       32768           8          1%

                     detail:      Protocol                    Used       %Used
                                  IPv4                      190970         97%
                                  MPLS                        5309          3%
                                  EoM                            1          1%
   ---------------------------- omited------------------------------- 

what does 72 bits means about??

is a TCAM size for one entry of ipv4, mpls, eom??

i can't find it in "Cisco - Output Interpreter"

I have this problem too.
0 votes
Correct Answer by Laurent Aubert about 6 years 11 months ago

Hi,

You're correct, 72 bits is the size for one TCAM entry. Multicast and IPv6 needs two entries.

Your TCAM looks full for IPv4 and MPLS entries. As you are not using all the entries allocated for IPv6 and multicast (8 over 32k) you could re-allocate some of those entries for IPv4 traffic:

AS1-PE2-6509#sh mls cef maximum-routes

FIB TCAM maximum routes :

=======================

Current :-

-------

IPv4 + MPLS         - 192k (default)

IPv6 + IP Multicast - 32k (default)


AS1-PE2-6509(config)#mls cef maximum-routes ?
  ip            number of ip routes
  ip-multicast  number of multicast routes
  ipv6          number of ipv6 routes
  mpls          number of MPLS labels

AS1-PE2-6509(config)#mls cef maximum-routes ip ?
  <1-239>  number of 1K entries

AS1-PE2-6509(config)#mls cef maximum-routes mpls ?
  <1-239>  number of 1K entries
It requires a reload.
HTH
Laurent.
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Correct Answer
Laurent Aubert Tue, 01/12/2010 - 18:34

Hi,

You're correct, 72 bits is the size for one TCAM entry. Multicast and IPv6 needs two entries.

Your TCAM looks full for IPv4 and MPLS entries. As you are not using all the entries allocated for IPv6 and multicast (8 over 32k) you could re-allocate some of those entries for IPv4 traffic:

AS1-PE2-6509#sh mls cef maximum-routes

FIB TCAM maximum routes :

=======================

Current :-

-------

IPv4 + MPLS         - 192k (default)

IPv6 + IP Multicast - 32k (default)


AS1-PE2-6509(config)#mls cef maximum-routes ?
  ip            number of ip routes
  ip-multicast  number of multicast routes
  ipv6          number of ipv6 routes
  mpls          number of MPLS labels

AS1-PE2-6509(config)#mls cef maximum-routes ip ?
  <1-239>  number of 1K entries

AS1-PE2-6509(config)#mls cef maximum-routes mpls ?
  <1-239>  number of 1K entries
It requires a reload.
HTH
Laurent.
Sanghee Han Tue, 01/12/2010 - 18:43

thanks for your answer.

it's great help, thanks again.

i'm tunning the parametor about TCAM size.

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