Re: [nsp] Gigabit Ether Channel on Cisco 12000s

From: Majdi S. Abbas (msa@samurai.sfo.dead-dog.com)
Date: Fri Jul 19 2002 - 00:37:32 EDT


On Thu, Jul 18, 2002 at 02:12:05PM -0700, Chris Whyte wrote:
> Btw, it's 5Gbps full-duplex, *not* 2.5Gbps full-duplex.

        No, it's not:

        "2.5 Gbps switch fabric (80 Gbps switching system
bandwidth) - This consists of the GSR16/80-CSC and the
GSR16/80-SFC fabric set. Each SFC or CSC card provides a
2.5 Gbps full-duplex connection to each line card in the
system. For a Cisco 12016 with 16 line cards, each with
2 x 2.5 Gbps capacity (full duplex), the system switching
bandwidth is 16 x 5 Gbps = 80 Gbps."

        Note also that:

        "On 120xx models, each 2.5 Gbps chassis slot has up
to four 1.25 Gbps serial line connections, one to each of
the switch fabric cards to provide a total capacity of 5 Gbps
per slot or 2.5 Gbps full duplex."

        The upgraded fabric in the 124xx series is 10 Gbps
full-duplex, so you will not find any 12xxx model with 5
Gbps full-duplex to a slot.
        
> The docs don't tell the whole story (as usual). :-)

        They seem pretty clear to me, Chris.

        --msa



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