[c-nsp] Sup2T-XL vs Sup720BXL FIB TCAM
Christian Schmit
cschmit at visual-online.lu
Tue Nov 5 11:31:54 EST 2013
Sorry for the screwy formatting, here should be a better output:
Sup2T-XL output of "sh platform hardware capacity":
CAT6500-RC2TXL#sh platform hardware capacity | begin L3 Forwarding Res
L3 Forwarding Resources
FIB TCAM usage: Total Used %Use
72 bits (IPv4, MPLS, EoM) 1048576 466211 44%
144 bits (IP mcast, IPv6) 524288 14905 3%
288 bits (IPv6 mcast) 262144 1 1%
detail: Protocol Used %Used
IPv4 466209 44%
MPLS 1 1%
EoM 1 1%
IPv6 14896 3%
IPv4 mcast 9 1%
IPv6 mcast 1 1%
Adjacency usage: Total Used %Used
1048576 32018 3%
Sup720BXL output of "sh platform hardware capacity":
(FIB TCAM partitioned with "mls cef maximum-routes ip 768")
CAT6500-RC720BXL#sh platform hardware capacity | begin L3 Forwarding Res
L3 Forwarding Resources
FIB TCAM usage: Total Used %Used
72 bits (IPv4, MPLS, EoM) 802816 467625 58%
144 bits (IP mcast, IPv6) 122880 14975 12%
detail: Protocol Used %Used
IPv4 467615 58%
MPLS 9 1%
EoM 1 1%
IPv6 14968 12%
IPv4 mcast 4 1%
IPv6 mcast 3 1%
Adjacency usage: Total Used %Used
1048576 1480 1%
On 05/11/2013 17:18, Jon Lewis wrote:
> Your paste formatting got all screwy, but it looks like the Sup2TXL
> claims it can do both 1M v4 routes _and_ half a million v6 routes
> simultaneously. I've heard that from others, but also read the specs to
> be the same as the 3BXL. I wonder if anyone from cisco can shed some
> light on this?
>
> On the Sup2T-XL, had you done any mls cef maximum-routes tuning? The
> page below both states that the PFC4XL has no more FIB capacity than the
> PFC3XL, and that the default split on the PFC4XL is 512k IPv4 routes.
> This doesn't appear consistent with what you're seeing.
>
> http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/white_paper_c11-676346.html
>
>
> The FIB in the PFC4 contains 256 K entries, while the FIB in the PFC4XL
> contains 1 million entries. These are the same as their PFC3x forwarding
> engine counterparts. The FIB in the PFC4 contains prefix entries for
> IPv4 and IPv6 global address, IPv4 and IPv6 multicast addresses and MPLS
> label entries. There is a level of partitioning that exists to ensure
> there is always some space available for different types of forwarding
> entries. There is some flexibility from a user configuration standpoint
> that allows these partition boundaries to be changed to accommodate more
> of one type of forwarding entry. For example, in the PFC4XL, the default
> setting provides for 512 K IPv4 entries, and this can be increased
> through configuration control to support up to 1 M entries if required.
>
> On Tue, 5 Nov 2013, Christian Schmit wrote:
>
>>
>> Today I tested a Sup2T-XL and a Sup720BXL in the lab with full bgp
>> feeds for ipv4 and ipv6.
>> To my understanding the hardware capacity for the FIB TCAM is the same
>> for Sup720-BXL and Sup2T-XL.
>> Sup2T-XL output of "sh platform hardware capacity":CAT6500-RC2TXL#sh
>> platform hardware capacity | begin L3 Forwarding Resources
>> L3 Forwarding Resources FIB TCAM
>> usage: Total Used
>> %Used 72 bits (IPv4, MPLS, EoM) 1048576
>> 465980 44% 144 bits (IP mcast, IPv6)
>> 524288 14903 3% 288 bits (IPv6
>> mcast) 262144 1 1%
>> detail: Protocol
>> Used %Used
>> IPv4 465978
>> 44% MPLS
>> 1 1%
>> EoM 1 1%
>> IPv6
>> 14894 3% IPv4
>> mcast 9
>> 1% IPv6 mcast
>> 1 1%
>> Adjacency usage: Total
>> Used
>> %Used
>> 1048576 32018 3%
>>
>> Sup720BXL output of "sh platform hardware capacity": (FIB TCAM
>> partitioned with "mls cef maximum-routes ip 768")
>> CAT6500-RC720BXL#sh platform hardware capacity | begin L3 Forwarding
>> Resources
>>
>> L3 Forwarding Resources
>> FIB TCAM usage: Total
>> Used %Used
>> 72 bits (IPv4, MPLS, EoM) 802816
>> 467348 58%
>> 144 bits (IP mcast, IPv6) 122880
>> 14970 12%
>>
>> detail: Protocol
>> Used %Used
>> IPv4
>> 467338 58%
>> MPLS
>> 9 1%
>> EoM
>> 1 1%
>>
>> IPv6
>> 14963 12%
>> IPv4 mcast
>> 4 1%
>> IPv6 mcast
>> 3 1%
>>
>> Adjacency usage: Total
>> Used %Used
>> 1048576
>> 1481 1%
>>
>> The release notes say:
>>
>> -XL mode:
>>
>> · IPv4 and MPLS: Up to 1,007,000 routes
>> · IPv4 multicast and IPv6 unicast and multicast: Up to 503,000 routes
>>
>> "These are the theoretical maximum numbers of routes for the supported
>> protocols (the maximums are not supported simultaneously):"
>>
>> The above output of the Sup2T-XL seems to say that the Sup2T-XL has a
>> larger FIB TCAM (2M) than the Sup720-BXL.
>>
>> Christian
>>
>>
>> _______________________________________________
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>
> ----------------------------------------------------------------------
> Jon Lewis, MCP :) | I route
> | therefore you are
> _________ http://www.lewis.org/~jlewis/pgp for PGP public key_________
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