Solved: QoS for next-generation Multicast

Alexandre Semenov · ‎11-09-2020

Hello,

I am trying to configure next-generation multicast between Juniper and Cisco IOS XR according to book "MPLS in the SDN era" page 200-240 and question I have is how QoS is supported in this type of traffic? Can we prioritized over another type of traffic? Any information will be very helpful.

Thanks,

Joseph W. Doherty · ‎11-10-2020

As far as I know, QoS doesn't "care" whether traffic is unicast, multicast or even broadcast.

However, if your QoS is based on IP's ToS, and you place such traffic into MPLS, the latter generally uses the EXP bits (only 3) for QoS purposes. If MPLS is using the EXP bits, you lose granularity vs. IP's ToS (much as you do using L2 frame's CoS bits).

View solution in original post

Joseph W. Doherty · ‎11-10-2020

As far as I know, QoS doesn't "care" whether traffic is unicast, multicast or even broadcast.

However, if your QoS is based on IP's ToS, and you place such traffic into MPLS, the latter generally uses the EXP bits (only 3) for QoS purposes. If MPLS is using the EXP bits, you lose granularity vs. IP's ToS (much as you do using L2 frame's CoS bits).