Thanks! So it would be correct to say you should NEVER see oversubscription on a channelized DS3 card right? Obviously, you can overdrive a single T1, but you'd never see drops due to the PIC itself? I guess what I'm asking is whether or not the bandwidth availalble on a FPC is allocated equally per PIC, or if everyone sort of shares it.
On Sat, Feb 23, 2013 at 8:13 PM, Christopher E. Brown < [email protected]> wrote: > > With the std cfeb after internal overhead per bus capacity is 3.2Gbit of > traffic, this is worst case minimum small packets, etc. > > Raw bus capacity is IIRC ~ 4Gbit, difference is overhead. > > Unless you are doing all small packet, actual limit is higher than 3.2. > > Enhanced CFEB bumps the raw bus capacity to something around 5Gbit, and > the after all overheads forwarding capacity to 4Gbit (based on the 1G > per PIC limit). > > Summ... > > CFEB > Up to 1Gbit per PIC, 3.2Gbit per bus _worst case small packet_ > > E-CFEB > Up to 1Gbit per PIC > > > These figures are > On 2/23/13 6:01 PM, Matt Bentley wrote: > > OK - so there has been a lot of discussion around this that I've seen, > but > > I've searched for hours and still can't find concrete answers. Can > someone > > help? > > > > 1. Does the 3.2 Gbps throughput limitation include overhead? In other > > words, Is the "raw" throughput 4 Gbps with effective throughput of 3.2 > > Gbps? Or is it 3.2 Gbps of raw throughput with effective throughput of > 2.5 > > Gbps? > > 2. Is this throughput per PIC on the FPC? So let's say I have three 4x > > GigE IQ2 PICs and one channelized DS3 IQ PIC. Does each PIC get > bandwidth > > allocated equally between them? So is it 800 Mbps per PIC, and the PICs > > can't "steal" bandwidth from another one? > > 3. Where, and based on what, is traffic dropped with Juniper head of > line > > blocking (ie where multiple high speed input interfaces try to go out the > > same lower speed exit interface)? > > > > Thanks very much! > > _______________________________________________ > > juniper-nsp mailing list [email protected] > > https://puck.nether.net/mailman/listinfo/juniper-nsp > > > > > -- > ------------------------------------------------------------------------ > Christopher E. Brown <[email protected]> desk (907) 550-8393 > cell (907) 632-8492 > IP Engineer - ACS > ------------------------------------------------------------------------ > _______________________________________________ > juniper-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/juniper-nsp > _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
