[c-nsp] 6VPE on 7600 RSP720 3CXL

[Pete Templin]

Just a tiny tidbit related to TCAM reallocation, make sure the SP 
bootvar's config register matches the RP bootvar's config register. In 
tech-speak, 'sh bootv | i eg' should match 'rem com sw sh bootv | i eg'. 
If it doesn't, "conf t; config-register 0x2142; end; conf t; 
config-register 0x2102; end; copy run start" and recheck. A mismatch in 
how the SP pre-configures itself is immaterial for the basics of IOS 
configuration stuff, but fatal with respect to TCAM; the box will 
forcibly reload after 5 minutes endlessly until fixed.

On 10/20/2015 1:55 AM, James Bensley wrote:
> On 14 October 2015 at 13:32, krunal shah <krun.shah at gmail.com> wrote:
>> hi NSPs,
>>
>> Is any one doing 6VPE and importing full IPv4 and IPv6 routes in same VRF?
>>
>> I am planning to implement full IPv6 and IPv4 routes in same VRF that is
>> used for internet service and other PE routers would only get subset or
>> default routes. Suip has 4 GB of memory, My 1M TCAM space is carved with
>>
>> FIB TCAM maximum routes :
>> =======================
>> Current :-
>> -------
>>   IPv4                - 768k
>>   MPLS                - 16k (default)
>>   IPv6 + IP Multicast - 120k (default)
>
> We are not doing this on any 7600 's but will be shortly so we'll
> start testing soon. Our 7600's are being bumped up to 15.3(3)S6, all
> running with RSP720-3XCL-10GE's and the TCAMs will be repartitioned,
> this will then hopefully see them out until they are decomissioned.
>
> The TCAMs need reallocating as they are currently carrying a lot of
> VPNv4 routes as well as the full IPv4 table and 6VPE was not
> envisioned, however your partitioning of the TCAM seems a litte too
> favourable for IPv6 for our needs;
>
> FIB TCAM maximum routes :
> =======================
> Current :-
> -------
>   IPv4 + MPLS         - 960k (default)
>   IPv6                - 16k
>   IP Multicast        - 16k
>
> FIB TCAM usage:                     Total        Used       %Used
>   72 bits (IPv4, MPLS, EoM)       983040      658740     67%
>
> I will probably aim for 60k IPv6 routes, so it's enough to phase out
> the boxes and that's it. Be careful that these boxes will start to CPU
> switch packets before you run out of TACM. When you see these logs
> you're in trouble;
>
> %MLSCEF-SP-4-FIB_EXCEPTION_THRESHOLD: Hardware CEF entry
>   usage is at 95% capacity for IPv4 unicast protocol
>
> %MLSCEF-DFC4-7-FIB_EXCEPTION: FIB TCAM exception, Some
>   entries will be software switched
>
> %MLSCEF-SP-7-FIB_EXCEPTION: FIB TCAM exception, Some
>   entries will be software switched
>
>
> Cheers,
> James.
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