Appendix Cabout Qos - SMC Networks HPAV-ESW Manual

Appendix C About QoS
The SMCHPAV-ESW allows 4 levels of Channel Access Priority (CAP, 0 – 3). The 8 levels of VLAN Ethernet tags
must be mapped to the 4 levels of CAP priority, where CAP 3 is the highest priority and CAP 0 is the lowest. CAP 3
priority is used for voice and network management frames, CAP 2 is used for streaming video and music while CAP 1
and CAP 0 are used for data.
Default CAP
The Default CAP group allows default priority mapping of packets that do not have a VLAN tag. Settings are available
for unicast (directed to a host).
IGMP - (default CAP 3) - set the channel access priority for IGMP frames - these are the group management
frames, not the stream data
Unicast - (default CAP 1) - set the default channel access priority for unicast frames not matching any other
classification or mapping.
IGMP managed Multicast Stream (Fixed to CAP 2) - set the default channel access priority for stream data
belonging to a snooped IGMP multicast group.
Multicast/Broadcast - set the default CAP for multicast frames not in a snooped group and for broadcast frames.
The following are the factory default settings for VLAN Tags and TOS Bits:
VLAN Tag
User priority
Default CAP
Priority
0 CAP1
CAP0
1
2 CAP0
3 CAP1
4 CAP2
5 CAP2
6 CAP3
7 CAP3
22
TOS Bit User Default CAP
Priority Priority
0 CAP1
CAP0
1
2 CAP0
3 CAP1
4 CAP2
5 CAP2
6 CAP3
7 CAP3