QoS policy propagation through BGP (QPPB) supports which two QoS markers? (Choose two.)
A.
DSCP
B.
IP precedence
C.
QoS group
D.
COS
E.
MPLS EXP
Explanation:
The QoS Policy Propagation is Border Gateway Protocol (BGP) feature allows you to classify packets based on access lists, BGP community lists and BGP autonomous system (AS) paths. The supported classification policies include IP precedence setting and the ability to tag the packet with a QoS class identifier internal to the router. After a packet has been classified, you can use other QoS features such as CAR and WRED to specify and enforce business policies to fit your business model.
QPPB uses BGP attributes to advertise CoS to other Routers in the network BGP communities are usually used to propagate CoS information bound to IP networks. Packet classification policy can be propagated via BGP without having to use complex access lists at each of a large number of border routers. A route map is used to translate BGP information (For example BGP community Value) into IP precedence or QoS group QPPB can only classify and mark inbound packets.