[c-nsp] Packet fragmentation methods for QoS

[MADMAN]

Everton da Silva Marques wrote:

> The task at hand is to compare packet
> fragmentation mechanisms for breaking
> down large datagrams so to guarantee
> low latency for prioritized voice packets
> carried over somewhat slow WAN links.
> 
> The classical Cisco scenario for
> network providers seems to be to
> run CBWFQ+LLQ+MLPPP/LFI at 
> provider/customer edge.
> 
> May anyone recommend an alternative
> method than MLPPP/LFI for packet
> fragmentation at provider/customer
> edge?
> 
> Has anyone performed testing with
> reducing MTU size at WAN links in
> order to make the edge routers
> (both PE and CE) to break down
> large datagrams? How does it
> compare to LFI?

   No since it wouldn't make much sense.  By simply reducing the MTU 
your  only making the transmission of packets more inefficient but doing 
nothing to gaurentee voice quality.  With LFI you bust up the large 
datagrams and interject voice packets inbetween this newly busted up 
datagram to preserve the <20ms serialization that is recommended.

   Dave

> 
> Any pointers appreciated.
> 
> Regards,
> Everton
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
> 

-- 
David Madland
CCIE# 2016
Sr. Network Engineer
Qwest Communications
612-664-3367

"Emotion should reflect reason not guide it"