IPTV

1. When will the marking function take effect ?

[Leon]: In CLI, when you type “set qos eth1 tos mark enable”, the mark function will be enabled on eth1. As you type “get qos eth1”, you will see

TOS Marking: Enabled

Currently, dot1p mark has some problem. So I just talk about TOS at this time.

Enabling tos mark on eth1 means that when an AP sees a voice|video|data|Background packet on its ingress eth1 port, the packet will be marked as the desired TOS value as shown below.

TOS marking: VoIP=0xE0, Video=0xA0, Data=0x18, Background=0x20

For the above example, each voice packet the AP sees will be marked a TOS value with 0xE0.

2. The TOS and 802.1p marking function will re-mark the original tos field for down/up link ?
ex:

wireless client ))) ((( AP-----remote host

(zing client -q0x30) <--------------- (zing --server -q0x30)

[Leon] In your example, it is not the marking process. It looks like the process of TOS classification. If we type “set qos tos classification enable”, then each time the AP sees the TOS value in the packet shown below,

TOS Classification: Voice=0xE0,0xC0,0xB8, Video=0xA0,0x80, Data=none, Background=none,

then the packet will be classified into voice|video|Data|Background according to the above TOS values. This looks like the revert function of TOS marking.

3. I have tried to disable "UDP Heuristic Classification" , and I don't know what the rules of smartcast will be follow.

UDP Heuristic Classification is not that easy to describe. But roughly speaking, “UDP Heuristic Classification” is the process to classify a packet for UDP unicast packet. To disable UDP Heuristic Classification means that if your packet is not previous classified and has no TOS/dot1p value on it, the packet will be regarded as default priority, i.e., data. If you enable it, then you got a chance to classify to the proper priority.