Support priority queuing. When CoS queue is in congestion, it drops frames
selectively.
4.3 Software Architecture
Ethernet switch ZXR10 5250 series switch is capable of L2 switching, providing L2
wire-speed switching and QoS guarantee. The system software implements
management, control and data forwarding of system. Its basic tasks include system start,
system configuration and management, protocol operation, table maintenance, switching
chip setting and state control, and some special packet software forwarding. System
software mainly implements the following functions:
It implements major L2 protocol functions including 802.1D STP protocol, 802.1P priority
control, 802.1Q VLAN functions, and 802.3ad link aggregation. It supports IPv4 protocol
stacking. It realizes multi-layer services of ACL and DHCP. It implements part of
broadband access functions and network management protocol.
Users can take network management of Ethernet switch by serial interface terminal,
Telnet, and SNMP Manager, covering network configuration management, failure
management, performance management, and security management.
System software can be divided into the following four sub-systems based on the above
system function requirements.
Operation support sub-system. It includes software modules of BSP, ROS, SSP.
MUX sub-system. It includes data distributing module, statistics monitoring
module and drive encapsulating module. Data distributing module takes charge of
distribution of data packets in the drive and upper layer software. Statistics
monitoring module takes charge of statistics data forwarding message and drive
software table monitoring.
L2 sub-system. It includes STP, LACP, IGMP SNOOPING, MAC address
management, VLAN management, and L2 data forwarding.
Network management and operation maintenance sub-system. It implements
Agent function of SNMP network management. It supports command line
management, provides operation maintenance interface and provides MIB
information.
4.3.1 Operation Support Sub-system
Operation support sub-system drives and encapsulates hardware in the lower layer to
provide support for other software systems in the upper layer. Operation support
sub-system mainly provides support for hardware operation, distributes operation
resource for hardware, and provides related interface for software in upper layer.
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