Hi, On Wed, Jun 29, 2011 at 04:14:20PM +0100, [email protected] wrote: > Our Internet BGP tier is currently provided by a pair of 7206VXR routers > with NPE-G1s which are getting quite long in the tooth. We've recently > been able to reclaim a pair of Sup720-3BXLs and the associated 6509 > chassis'. Its our intention to retire the 7206s and replace them with the > 6509s /w Sup720s but we require 6 GigE interfaces per box. We have a pair > of WS-X6408A-GBIC 'classic bus' linecards on the shelf (no spare 65XX or > 67XX modules unfortunately) but my question is whether using the > WS-X6408A-GBIC to provide port capacity is a good or bad idea in this > scenario?
It will work just fine, given that you're not going to max out the bus with a single 8G card :-) [..] > My real concern is that I've found two different Cisco documents that > describe the Forwarding-Engine Architecture differently for classic > linecards. > This link :- > http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/product_data_sheet0900aecd801459a7.html > states that "the Supervisor engine CPU makes forwarding decision" That's not fully correct - it's "the Supervisor engine" (as opposed to "the DFC card on a 6700 module+DFC") but not "the CPU". > and this link:- > http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/product_data_sheet0900aecd8017376e.html > states that "Centralized Cisco Express Forwarding engine located on > supervisor policy feature card (PFC) makes forwarding decision" The PFC is part of the Supervisor engine. > As the 6500 series is a hardware-based platform I'm keen to make use of > hardware-supported features where available and not experience unexpected > issues from high CPU utilisation. > Can anyone confirm exactly how traffic will be forwarded by the > Sup720-3BXL with a WS-X6408A-GBIC in the chassis? Bus, PFC, Hardware. Unless you hit one of the (rare) feature combinations that require CPU-based CEF on the Sup720. gert -- USENET is *not* the non-clickable part of WWW! //www.muc.de/~gert/ Gert Doering - Munich, Germany [email protected] fax: +49-89-35655025 [email protected]
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