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26 ZT8101 User’s Manual
Switch Management and Operating Concepts
Router Ports
Router ports allow multicast packets to be propagated throughout the network. Router ports can be
either static or dynamic. Static router ports are special routes that you manually enter into the
switch’s routing table. Usually it is a port that has a router attached to it, and the router has a
connection to a WAN or to the Internet. Static router ports should be used sparingly, because when
a network failure occurs, they do not change. However, they can reduce network traffic by
eliminating the need for a routing protocol on a local network. For example, a local network, which
has only one link to the network, is an ideal candidate for a static route. You can also use them to
restrict the transmission path a datagram must follow, based on the datagram's destination address.
You can add up to 32 static entries into the routing table.
Dynamic router ports are added by the switch. The switch monitors each port for UDP multicast
packets and IGMP multicast group membership reports. When these packets are detected on a port,
that port is dynamically assigned as a router port.
Priority
MAC address priority is a Layer 2 Class of Service. It allows certain frames, based on their MAC
address, to receive special handling.
The frames can be prioritized based on where the MAC address appears:
• The source only
• The destination only
• Both the source and destination
Frames that match the criteria are given a priority tag. The switch supports only four hardware
priority levels per egress port, so the eight levels are mapped to four as listed in the table below.
After an Ethernet frame has been prioritized, the switch forwards the Ethernet frame using the strict
priority-based scheduling algorithm. With this policy, any packets residing in a higher priority
queue are always transmitted first. Only when these queues are empty are packets in lower priority
queues transmitted.
Filtering
A filtering database is used to segment the network and control communication between segments.
It can also filter packets off the network for intrusion control. Static filtering entries can be made by
MAC or IP addresses.
Priority in Frames Priority Queue of ASIC
0 - 1 0
2 - 3 1
4 - 5 2
6 - 7 3