I have a question regarding performances of Cisco 7600 or Cisco 6500 routers.
In documentation accessible on Cisco web site it can be seen that all normal traffic forwarding is handled in hardware.CEF is in hardware and even it is downloaded to linerads if there is DFC available on them.So theoraticaly if Cisco 7609 is full packed with Gigabitethernet modules, TenGigabitEthernet modules etc (i.e. one supervisor 720 BXL and 8 linecards all up and runnig) it would handle it in hardware and it woudn't be any degradation in performance,As I understood Its matrix is not oversubscribed.
Question is in what situations I can experience performace degreadation for this series of routers (regaridng traffic forwarding)? sholudn't it work even if all its interfaces are 100% utilized?
And regarding its CPU (on MSFC) if it is used i.e for BGP internet routing isn't it more question of memory capacity? I know that controll or dynamic routing protocols like BGP are handled by CPU (not in hardware). Regarding BGP the most significan't factor is how big routing table is
(and in Internet it is more all less 200.000 routes) due to scanner process. Is it also important how much BGP session (BGP peers)
router handles? As I understood it is not so much intensive as BGP scanner.
Thanks in advance,
Port buffers etc. on the linecards are hardware based so as far as i know packets will be queued and then potentially dropped if the forwarding capacity is reached. Again this is not directly related to DFC/CFC.