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Webcast-Catalyst9k
New Member

[4500] frame forwarding path

hi,

if a frame comes in a switch port:

do all frames touch the switch backplane?

do the the asic's forward any frame directly to another port? (in which case do they do this?)

the reason i'm asking this is because of the 6Gbps backplane capacity on a 48 10/100/1000 port blade. i want to know if at least some of the frames do now go through this 'bottleneck'.

if anybody out there has a document that explains the forwarding path and the difference if this is a layer2 pdu and a layer 3 pdu..i'd really appreciate it.

thanks,

c.

1 REPLY
Cisco Employee

Re: [4500] frame forwarding path

Yes..All the switching decision has to be done on the Supervisor Engine on most Catalyst switches. Exception to this are DFC equipped line cards in a CAT6500 switch where in the line cards get the forwarding table downloaded from the PFC

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