[j-nsp] How to CoS on M-series Fe interface but connected to Fe/E3converter ?

[michael.firth at bt.com]

We recently hit a similar problem, and the answer from Juniper was 'you
can't', at least for M series routers. 

The J series boxes have a facility called 'virtual-channels' which
achieves this, but their performance is obviously not the same as an M
series box. That said, the new J6x50 boxes are a lot better than the
older J series boxes, and are capable enough for many applications.

Hope this helps

Michael



> -----Original Message-----
> From: juniper-nsp-bounces at puck.nether.net 
> [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Dang at onsite
> Sent: 16 January 2007 04:27
> To: juniper-nsp at puck.nether.net
> Subject: [j-nsp] How to CoS on M-series Fe interface but 
> connected to Fe/E3converter ?
> 
> 
> Hi,
> 
> I have this topo:
> 
> multi-ingress_FE------------>M7i-FE---------->Fe/E3_converter-
> ---------------------->
> 
> I need to CoS on FE interface but do not know how to let this 
> M7i know about "the real bw" 34Mbps of the Fe/E3 converter . 
> Congestion can happen on egress link of M7i to converter.
> 
> You can policer each forwarding class, but then can not reuse 
> the vacant bw of other classes.
> 
> You can policer the egress traffic to max value of 34M, but 
> you can not maintain the scheduler rate ratio.
> 
> Is there any way to maintain the same scheduler rate ratio 
> for E3 rate as well as bandwidth re-utilization between all 
> forwarding classes ?
> 
> BR,
> 
> Dang
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