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NOTE:

Do not connect two switches together with more than one cable. Using multiple cables to

connect switches can create a loop and cause collisions.

Figure 1-4. Cascading Switches

Connecting Switches to Systems

By connecting a switch to systems, you can form a small network. To improve network efficiency,

use 1000-Mbps full-duplex operation between the server and switch if the LAN adapter on the

server can operate in full-duplex mode.

All the RJ-45 ports support Auto MDI/MDIX and therefore automatically detect the type of cable

used to connect the network device. Crossover or straight-through networking cables can be used

to connect PCs as well as other networking devices like hubs or routers to the switch. All ports on

the switch automatically negotiate speed and whether to operate in full duplex or half duplex.

Class-of-Service

The switch supports tag-based prioritization following the IEEE 802.1p standard. The eight levels

of IEEE 802.1p priority are mapped to the two priority queues of each port. For each port, the two

priority queues are scheduled following a Weighted Round Robin scheme.

Table 1-1. Tag-Based Prioritization

IEEE 802.1p Priority

0-3

4-7

NOTE:

The IEEE 802.1p priority information is part of the IEEE 802.1q tag that also defines VLAN

memberships. The switches will ignore the VLAN membership information in the tag (that is, all ports are

part of all VLANs), but will preserve the full tag information—including packet priority and VLAN ID—

when transmitting the packet at the destination port.

Priority Queue

Scheduling Weight

Introduction