[c-nsp] Cisco 7600 vlan issue

Julio Arruda jarruda-cnsp at jarruda.com
Mon Dec 1 14:50:18 EST 2008

Ian Cox wrote:
> Julio Arruda wrote:
>> I was under impression the L3 forwarding and the L2 forwarding was done
>> by the same engine, in the PFC card(s) ? and behind it, the EARL for the
>> lookup and the rewriting of the header info (mac rewrite, dec ttl and
>> goes on) ?
> PFC/DFC - is the customer facing name for the L2 and L3/L4 forwarding
> engines on the 6500.
> EARL x - is the internal name used to refer to the L2 and L3/L4
> forwarding engine, x being the generation of the forwarding engine. EARL
> generation and PFC/DFC versions do not directly match, but map as follows
> 5	PFC		Supervisor 1A
> 6	PFC2 / DFC	Supervisor 2
> 7	PFC3 / DFC3	Supervisor 720
> Depending upon the features and the availability of particular ASIC
> processes the forwarding engine has ranged from four ASICs to a single
> ASIC. The exact number varies from generation to generation, and even
> within revisions within a generation.

And I understand Nexus is the EARL8, correct ?
And this would also mean the 3B, 3C and the XLs are all EARL7, but with 
distinct sizes for the TCAMs tied to them ?

There is any document on Cisco website with this level of detail, and 
the other less 'obvious' cards, like the ES20 and the others ?

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