Quality of Service
IPv6 QoS, like the acquisition protocols discussed in the two antecedent sections, has a abundant accord in
common with IPv4 QoS. This is a aftereffect of Cisco’s three-step, hierarchical action for QoS
implementation. The aforementioned above QoS methods are accessible for IPv6 as for IPv4, and configuring
them application the Modular QoS CLI (MQC) will additionally be familiar. Be abiding that you are accustomed and
comfortable with QoS agreement for IPv4 afore arrest this area of the chapter.
With account to the Cisco IOS version, abounding of the IPv6 QoS appearance in this area accept been
implemented for some time, some as aboriginal as adaptation 12.0. However, the IOS adaptation on which
this area is based is 12.4 Mainline.
Before accepting into details, amuse agenda that these appearance are not accessible in IPv6 QoS
implementation on Cisco routers:
■ Network Based Application Recognition (NBAR)
■ Compressed Real-Time Protocol (cRTP)
■ Committed admission amount (CAR)
■ Priority queuing (PQ)
■ Custom queuing (CQ)
As you can see from this list, three of the bristles items, CAR, PQ, and CQ, are bequest QoS features.
Supporting these appearance in a new accomplishing does not accomplish sense, because the MQC
handles the aforementioned functions. In IPv4, these technologies abide accurate to abstain banishment users
to drift to the agnate MQC-configured affection set. But because IPv6 is newer in Cisco IOS
than CAR, PQ, and CQ, there is no acumen to apparatus two methods of configuring these
features; thus, the MQC affection implementations are the ones deployed in Cisco IOS for IPv6.