On 02.03.2012 13:07, Łukasz Bromirski wrote:
On 2012-03-02 09:13, Artyom Viklenko wrote:
I'm tring to clarify my understanding of switching paths on these
line cards. From one point of view, Cisco docs says that if the
traffic should ingress via one port on the line card and then
should egress through another port on the same line card it will
never leave this line card. So it will be switched via internal
bus. Right?
No, and if it says so somewhere, please point it to the doc team
to fix it.
Both 6704 and 6708 have two complex of Fabric ASICs.
The 6708 you can see on figure 21 here:
http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/prod_white_paper0900aecd80673385.html
The port mappings for Fabric ASICs should be found in the hardware
installation notes under the 'Switch fabric connections' in the
tables for specific LC:
http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/hardware/Module_Installation/Mod_Install_Guide/02ethern.html#wp1048010
Essentially, traffic from one Fabric ASIC to the ports on the
other Fabric ASIC will go over the fabric itself. Only traffic
belonging the the same Fabric ASIC will be switched locally if of
course there's a DFC installed.
ok. Now I see
Switch Fabric Resources
Bus utilization: current: 13%, peak was 51% at 21:31:26 EET Sat Feb
18 2012
Fabric utilization: Ingress Egress
Module Chanl Speed rate peak rate peak
2 0 20G 23% 46% @22:57 30Jan12 18% 49% @22:02
31Jan12
2 1 20G 21% 49% @20:08 01Feb12 25% 46% @20:14
25Feb12
I.e. 4,6 Gbps on channel 0 and 4,2 Gbps on channel 1. No DFC on module.
Total input on all four 10GE ~ 19 Gbps. Fabric switching only 8,8 Gbps.
Similar approach I see on 6708 with DFC. Some part of traffic goes via
fabric and some in line card itself.
AFAIK, presense of DFC influence only forwarding decisions process (and
policyng, for example) but not on moving traffic itself?
Anyway, if traffic should be switched in ASIC what is the limitations
in terms of bandwidth or PPS?
--
Sincerely yours,
Artyom Viklenko.
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