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Cisco Catalyst 2950/2960/3750 Multicast Traffic Preference

Hello all,

we, as a student company act as an ISP for university dormitories. We would like to (if it's possible) deploy QoS to prefer multicast traffic over all other types of traffic. 

Devices used in network:

Acces layer: Cisco Catalyst 2950,  12.1(22)EA14

Dristribution layer: Cisco Catalyst 2960G, 12.2(58)SE1 

Core layer: Cisco Catalyst 3750G, 12.2(52)SE


Do you see any possibility to solve this with these devices? We have almost no experience with QoS, therefore any help would be greatly appreciated. 


Thanks in advance.

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Hmm, I think it should be doable although the 2950s, if non-E variants, are especially weak in QoS features.  I.e. those might create some issues.

With the 2960G and 3750G, you often will create problems when you enable QoS because QoS, by default, allocates its buffers resources for 4 egress queues per port rather than using all for 1 egress queue per port.  However, this can be countered by QoS parameter tuning, but that takes some QoS expertize to match to your traffic and your overall QoS policy.

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