
Chapter 7. Cisco family routing products 247
QoS offers the following primary advantage:
Prioritization of traffic
The Cisco MDS 9000 Family supports QoS for internally and externally
generated control traffic. Within a switch, the control traffic is sourced to the
supervisor module and is treated as a high-priority frame. A high-priority status
provides absolute priority over all other traffic and is assigned in the following
cases:
Internally-generated, time-critical control traffic (generally Class F frames)
Externally-generated, time-critical control traffic entering a switch in the MDS
9000 range from another vendor’s switch
High priority ...