Multicast Music-on-Hold and IP/TV Configurations
The following example illustrates the recommended configuration for IP/TV streaming media. On the server-farm switch, configure the port connected to the IP/TV server to classify all traffic from the source as CoS=4 and to override any CoS value previously set.
interface GigabitEthernet0/1 description To IP/TV Server mls qos cos 4 mls qos cos override
Assign a CoS of 4 to any traffic arriving on this port Override previously classified CoS value with the one set above
Because a COS of 4 maps, by default, to a DSCP of 32 (CS4), the mls qos map command is optional for the IP/TV server-farm switch. Also, on the server-farm switch there is no need to remap any of the CoS values for Voice (CoS 5 by defalut maps to DSCP 46) or Voice-Control (CoS 3 by default maps to DSCP 26). All of these should be left at defaults for this example.
To verify that the default mappings are in place, issue the following command:
show mls qos maps cos-dscp
Cos-dscp map: cos: 0 1 2 3 4 5 6 7 --------------------------------
Once this mapping is complete, the IP/TV traffic can be scheduled and provisioned according to the CoS/DSCP values identified above.
In summary, when using IP multicast with MoH or IP/TV follow these recommendations. Multicast Music-on-Hold Increment on IP Address (recommended) Change max Hops to reflect specific routing topology (recommended) Allow G.729 Multicast Audio Source to Branch offices (recommended) Restrict G.711 and Wideband to local Campus (recommended) Provision LLQ appropriately to account for Multicast MoH streams in QoS Policy (recommended) IP/TV Server Use administrative scoping for different streams sizes (recommended) Boundary streams by using the scoped group address (recommended) Classify IP/TV streaming media at the ingress port in the server-farm switch
Use QoS markings of CoS=4 and DSCP=CS4 (recommended)
Cisco AVVID Network Infrastructure IP Multicast Design