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19 messages in net.nether.puck.cisco-nsp[c-nsp] Cisco 6509 and Bus speeds| From | Sent On | Attachments |
|---|---|---|
| Marcel Lemmen | Jan 13, 2005 7:44 am | |
| Colin Whittaker | Jan 13, 2005 8:23 am | |
| Arnold Nipper | Jan 13, 2005 8:32 am | |
| Paul Schopis | Jan 13, 2005 11:16 am | |
| Clinton Work | Jan 13, 2005 11:17 am | |
| Arnold Nipper | Jan 13, 2005 11:28 am | |
| Ethern M.C. Lin | Jan 13, 2005 11:36 am | |
| Arnold Nipper | Jan 13, 2005 11:42 am | |
| Tim Winders | Jan 13, 2005 11:43 am | |
| Tim Stevenson | Jan 13, 2005 11:51 am | |
| Tim Stevenson | Jan 13, 2005 11:51 am | |
| Tim Stevenson | Jan 13, 2005 11:51 am | |
| Mikael Abrahamsson | Jan 13, 2005 12:12 pm | |
| Ryan O'Connell | Jan 13, 2005 12:23 pm | |
| Ian Cox | Jan 13, 2005 3:38 pm | |
| Brad Bonin | Jan 13, 2005 3:44 pm | |
| Tim Stevenson | Jan 13, 2005 4:12 pm | |
| Paul Schopis | Jan 13, 2005 4:17 pm | |
| Michael Loftis | Jan 13, 2005 5:12 pm |
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| Subject: | [c-nsp] Cisco 6509 and Bus speeds | Actions... |
|---|---|---|
| From: | Michael Loftis (mlof...@wgops.com) | |
| Date: | Jan 13, 2005 5:12:31 pm | |
| List: | net.nether.puck.cisco-nsp | |
--On Thursday, January 13, 2005 08:51 -0800 Tim Stevenson <tste...@cisco.com> wrote:
See below: ... It is a 16G (32G marketing) bus. If you don't have DFCs, it is used to xfer packet headers to the sup for lookups, with DFCs, it is not used. In either case, the fabric channels, not the 16G bus, are used to xfer the actual packets/payload.
and therfor you shouldn't be able to transfer more then 8Gbps from one slot to another, or am I wrong in this one?
Wrong, with the cards you mention you have 2x20G (40G marketing) channels to each card (40G per slot, 80G marketing), except the 6724 (1x20G channel). These all interconnect thru the fabric on the sup.
...
What may not have yet been made clear is the 6509 has fabric and bus. the bus is rated at 2x8G (bi directional) and the fabric is 2x20G (also bi directional i believe)... this is where the 'marketing' numbers Tim mentions come from.
It does require DFC3 to achieve these rates, and DFC and DFC3 are NOT the same beast. More confusing cisco terminology :) the DFC3 is the child of DFC/next generation of the DFC board.
The fabric is used for the actual packet/payload, the bus is used to transfer control information, headers, location, and update the dCEF/CEF tables across the switch, as well as management traffic inside the switch.
I hope that helps to clear things up a bit....I also hope I didn't muddy things further by being incorrect :)
One thing of note, it may no longer be a problem though so YMMV, but don't run ANY traffic on the default/native VLANs on the cat's. Everything the RSP and SUP gets ends up punted to the processor on the default/native VLAN (usually vlan 1) -- this destroys performance. Only thing VLAN1 should be used for is switch management traffic and switch spanning-tree information/etc.