MPLS signaling

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1

Hi folks.

What is the most common way of doing MPLS signaling for LSP setup and
End to End QoS enforcement ?

LDP ? RSVP ? BGP-TE or OSPF-TE ?

Thanx
Paul

2

RSVP is commonly used for LSP signaling/setup at least in one of the largest
tier one's MPLS architecture. I'm not sure how many large ISPs use e2e QoS
enforcement (none in my experience with public IP networks). Several use
DSCP (actually IP Precedence) at the edge (CPE to ISP edge only). RSVP-TE
could be used if there was a need (reserving bandwidth) for e2e QoS
signaling, or alternatively perhaps Bandwidth Broker
(http://qbone.internet2.edu/bb/index.shtml) might be employed for the same
purpose.

Bryant Rump
Advanced Internetworking
Booz Allen Hamilton
rump_bryant@bah.com

3

So most people do manual QoS/bandwidth provisioning ?

I'm looking into this for L2 over MPLS VPN (Martini draft).

Thanx
Paul

4

I think this depends on the network. Most major tier 1 public IP backbones
do not necessarily run QoS through the core. MPLS in these networks is used
for traffic engineering such as constraint-based routing and dynamic LSPs.
Private MPLS-based networks may (and do) use dynamic QoS signaling. Maybe
someone who maintains one of these networks could chime in.

Bryant