[c-nsp] MPLS PE Routers for a Mobile Carrier?

[Saku Ytti]

On (2008-08-03 16:23 -0300), Rubens Kuhl Jr. wrote:
 
> "mls qos vlan-based" can be turned on to do PFC-QoS on VLANs... (at
> least on PFC3C, but I thought it was supported on other PFC3
> releases).
> 
> HQoS is nice for building services like "25% of the bandwidth has
> voice priority, if no voice traffic present you can go up to 100%, if
> more than 25% is voice than only 25% will have expedite forwarding",
> but if you provide simple CIR/PIR services per VLAN, differentiating
> needs by different VLANs, what could be achieved by HQoS that PFC-QoS
> would do only by dedicating a port ?

Well consider I have TenGig connection to my distribution, and customers
are terminated to VLAN subinterfaces. Now, obviously the router has no
clue what is actual speed of each VLAN. So lets say I have 2M 
corporate connection in one VLAN. To guarantee voice quality for 
that 2M customer, I'd need first shape it to 2M then inside that 2M space,
I'd need to prioritize VoIP.

Of course, if at all possible, QoS should be done in the port facing
the customer. Be it DSLAM port or Switch port, then you don't
have to care about QoS in aggregation/PE level and can get significant 
cost savings.

-- 
  ++ytti