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Which three steps are required to configure QPPB on Cisco IOS XR routers?

Which three steps are required to configure QPPB on Cisco IOS XR routers? (Choose three.)

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A.
Apply a QPPB route policy to the BGP process using the table-policy command

B.
Apply a QPPB route policy to the BGP neighbor using the route-policy command

C.
Define a QPPB route policy to match the customer routes, then set the IP precedence or qosgroup

D.
Define a QPPB route policy to match the customer IP precedence or qos-group markings,then
set the BGP community

E.
Enable QPPB on an interface using the ipv4 bgp policy propagation input ip-precedence|qosgroup destination|source command

F.
Enable QPPB on an interface using the ipv4 bgp policy propagation output ip-precedence|qosgroup destination|source command

Explanation:

QoS Policy Propagation via BGP (QPPB), is a mechanism that allows propagation of quality of
service (QoS)policy and classification by the sending party based on access lists, community lists
and autonomous systempaths in the Border Gateway Protocol (BGP), thus helping to classify
based on destination instead of sourceaddress.

2 Comments on “Which three steps are required to configure QPPB on Cisco IOS XR routers?”

  1. safronsoup says:

    QoS Policy Propagation via BGP (QPPB)
    • allows marking of packets assoc with BGP route
    • uses BGP attributes to associate marking information to IP networks
    • can only mark and classify inbound packets

    Classification base on ACL, BGP community lists, BGP AS path; classification policies include IP Precedence setting and ability to tag the packet with a QoS classification ID (qos group) internal to the router.




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  2. safronsoup says:

    QoS Policy Propagation via BGP (QPPB)
    • allows marking of packets associated with BGP route
    • uses bgp attributes to associate marking info to IP networks
    • can only mark and classify inbound packets

    Classification base on ACL, BGP community lists, BGP AS path; classification policies include IP Prec setting and ability to tag the packet with a QoS classification ID (qos group) internal to the router

    1. process packets entering an interface
    2. match the source or dest ip address of the packet in the routing table
    3. mark the packet with ip prec or qos group value shown in the routing table entry

    Interface g0/0/5/0 << ingress interface towards neighbors
    ipv4 bgp policy propagation {input} {qos-group | ip-precedence} {destination | source}
    !
    Router bgp 300
    Address-family ipv4 unicast
    Table-policy qppb-src10-20




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