It appears that the most active work in this area is done in the context of integrating DiffServ, RSVP-TE, Open Shortest Path First traffic engineering (OSPF-TE), and MPLS/LDP implementations, mostly on Linux platforms. The main Linux DiffServ resource is http://diffserv.sourceforge.net/. I am aware of two RSVP packages available at http://www.isi.edu/div7/rsvp/rsvp.html and http://www.kom.e-technik.tu-darmstadt.de/rsvp/.
Cisco IOS QoS and Queuing Architectures
The Cisco QoS architecture has evolved quite significantly over time with a strong foundation in (distributed [D]) CAR, (CB) WFQ, PRIQ, custom queuing, WRED, and the new D-WRED. It has evolved into a complete architecture that incorporates the capabilities of Frame Relay (discard eligibility [DE]) and ATM (cell loss priority [CLP]); IP to ATM CoS; in addition to 802.1P/Q marking, IntServ/RSVP and DiffServ, and a strong focus on MPLS-TE and MPLS QoS.
As in most IP stacks, FIFO queuing is the default behavior. Because of lab constraints, I am unable to present labs with 802.1P/Q, DiffServ, and advanced features here.
Recently, AutoQoS was added to the Cisco portfolio, which essentially covers the following in a more proactive way:
-
QoS classification and marking
-
QoS configuration and monitoring
-
QoS congestion avoidance
-
QoS congestion management
-
QoS link-efficiency mechanisms
-
QoS policing and shaping
-
QoS signaling
-
ATM/Frame Relay QoS
-
LAN switching QoS
0 comments:
Post a Comment