From: Jian Gu (guxiaojian@gmail.com)
Date: Wed Feb 06 2008 - 22:07:09 ARST
Quote "So you create more bandwidth with the DFC's , the PFC on the sup is
only used for the uplinks on the sup itself."
This is not true, PFC on the SUP makes all forwarding decision for packets
not entering DFC equiped line card. DFC downloads forwarding information
from PFC, all forwarding information change is made in PFC and then synced
to DFC
On Feb 5, 2008 10:43 PM, Steeneken, Robert <Robert.Steeneken@getronics.com>
wrote:
> If you only use 67xx cards and no classic cards I dont't think you need
> DFC's on the line cards.
> The 67xx cards have a 40Gbps fabric to the sup720. With the DFC's line
> cards keep local traffic on the card, and can directly send traffic to
> another linecard without sending it first to the sup.
> So you create more bandwidth with the DFC's , the PFC on the sup is only
> used for the uplinks on the sup itself.
>
>
>
> ________________________________
>
> Van: nobody@groupstudy.com namens Rookie Ccie
> Verzonden: di 5-2-2008 16:53
> Aan: ccielab@groupstudy.com
> Onderwerp: 6500 - 67xx line cards
>
>
>
> Dear Group,
>
> Please let me know whether we need to use DFC-3C cards on 67xx line cards
> to
> get 40Gbps per slot capacity. I went through lot of Cisco doc's but could
> not find that it is required (DFC-3C).
>
>
> Regards
>
> Uchil
>
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