By: Michael S (already5chosen.delete@this.yahoo.com), September 25, 2007 4:38 am
Room: Moderated Discussions
Aaron Spink (aaronspink@earthlink.net) on 9/24/07 wrote:
---------------------------
>Michael S (already5chosen@yahoo.com) on 9/24/07 wrote:
>---------------------------
>>I don't know whether it is blocking or not, but pass-through routing fall out of
>>favor in high-speed network infrastructure equipment a long time ago. I'd guess
>>there were reasons for preferring store-and-forward implementations over pass-through
>>probably related to corner cases in error recovery. So I expect that at least first
>>few generation of CSI would avoid path-through.
>>
>
>Many high performance networks today are designed to MAXIMIZE pass-through routing
>via means of virtual cut-through mechanisms.
>
Not in GBE switching. I didn't check recently, but 2-3 years ago all popular switches were store-and-forward. On the other hand, older 100BaseT switches are mostly pass-through.
>If you wanted to say that wormhole networks fell out of favor, that would be correct,
>but that has more to do with flow control than anything else. Most modern networks
>moved to quantized packeted networks for performance, flow control, and deadlock reasons.
>
>Aaron Spink
>speaking for myself inc.
Could you explain the difference between the terms pass-through, cut-through and wormhole? For me all three sound the same when applied to something like Ethernet or EB switch.
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>Michael S (already5chosen@yahoo.com) on 9/24/07 wrote:
>---------------------------
>>I don't know whether it is blocking or not, but pass-through routing fall out of
>>favor in high-speed network infrastructure equipment a long time ago. I'd guess
>>there were reasons for preferring store-and-forward implementations over pass-through
>>probably related to corner cases in error recovery. So I expect that at least first
>>few generation of CSI would avoid path-through.
>>
>
>Many high performance networks today are designed to MAXIMIZE pass-through routing
>via means of virtual cut-through mechanisms.
>
Not in GBE switching. I didn't check recently, but 2-3 years ago all popular switches were store-and-forward. On the other hand, older 100BaseT switches are mostly pass-through.
>If you wanted to say that wormhole networks fell out of favor, that would be correct,
>but that has more to do with flow control than anything else. Most modern networks
>moved to quantized packeted networks for performance, flow control, and deadlock reasons.
>
>Aaron Spink
>speaking for myself inc.
Could you explain the difference between the terms pass-through, cut-through and wormhole? For me all three sound the same when applied to something like Ethernet or EB switch.