cisco 7606 FIB Protocol Allocation mismatch after mls cef maximum-routes command

[paolo liberati]

Hi,

we are trying to fine tune the mls cef maximum-routes without success for ipv4 on our Cisco 7606 router equiped like this:

######################################################

Mod Ports Card Type                              Model              Serial No.
--- ----- -------------------------------------- ------------------ -----------
  2   24  CEF720 24 port 1000mb SFP              WS-X6724-SFP       SAL09169CP0
  6    2  Supervisor Engine 720 (Active)         WS-SUP720-3BXL     SAL10370YH7

Mod MAC addresses                       Hw    Fw           Sw           Status
--- ---------------------------------- ------ ------------ ------------ -------
  2  0013.c38b.ed9c to 0013.c38b.edb3   2.2   12.2(14r)S5  12.2(33)SRC1 Ok
  6  0017.9441.b750 to 0017.9441.b753   5.2   8.4(2)       12.2(33)SRC1 Ok

Mod  Sub-Module                  Model              Serial       Hw     Status 
---- --------------------------- ------------------ ----------- ------- -------
  2  Centralized Forwarding Card WS-F6700-CFC       SAL09159C8T  2.0    Ok
  6  Policy Feature Card 3       WS-F6K-PFC3BXL     SAL10360CJ0  1.8    Ok
  6  MSFC3 Daughterboard         WS-SUP720          SAL10360GNX  2.5    Ok

###################################################################

the show version is like this:

##################################################################

System image file is "bootdisk:c7600s72033-adventerprisek9-mz.122-33.SRC1.bin"

##################################################################

We tryied to set the value of the ipv4 FIB TCAM to 720k with this command:

##################################################################

mls cef maximum-routes ip 720

##################################################################

and then to save the configuration we used the "write" command. This was the output after we wrote the configuration:

##################################################################

FIB TCAM maximum routes :
=======================
Current :-
-------
 IPv4 + MPLS         - 512k (default)
 IPv6 + IP Multicast - 256k (default)

User configured :-
---------------
 IPv4                - 720k
 MPLS                - 16k (default)
 IPv6 + IP Multicast - 144k (default)

Upon reboot :-
-----------
 IPv4                - 720k
 MPLS                - 16k (default)
 IPv6 + IP Multicast - 144k (default)

###########################################################################

so we reloaded the router to get the new value.

when the router was up again it start to reload each 4 minutes. The FIB TCAM value was:

###########################################################################

show mls cef maximum-routes

Reload scheduled for 13:50:09 DST Wed Aug 13 2014 (in 2 minutes and 51 seconds)
Reload reason: FIB Protocol Allocation mismatchFIB TCAM maximum routes :
=======================
Current :-
-------
 IPv4 + MPLS         - 512k (default)
 IPv6 + IP Multicast - 256k (default)

User configured :-
---------------
 IPv4 + MPLS         - 512k (default)
 IPv6 + IP Multicast - 256k (default)

Upon reboot :-
-----------
 IPv4 + MPLS         - 512k (default)
 IPv6 + IP Multicast - 256k (default)

###########################################################################

We know that our cisco is able to handle up to 1M of ipv4 routes inside the TCAM but we cannot set more than 512k ipv4 routes.

Why the router doesn't accept the new value?

Thanks

http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/117712-problemsolution-cat6500-00.html

http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/116132-problem-catalyst6500-00.html

https://supportforums.cisco.com/discussion/12250356/recommended-value-7600-ipv4-fib-tcam

[paolo liberati]

Hi,

you can find it attached to this message.

thanks for your help

--

paolo