Dell PowerConnect 5548 User Guide - Page 388
Protected Ports, Protected Port Overview, Protected Port Restrictions
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Protected Ports Protected Port Overview Protected ports provide Layer 2 isolation between interfaces (Ethernet ports and LAGs) that share the same Broadcast domain (VLAN) with other interfaces. This can be used to set up a group of ports that receive similar services. A protected port does not forward traffic (Unicast, Multicast, or Broadcast) to any other protected port on the same switch. A community is a group of protected ports. Protected ports within the same community can forward traffic to each other. The following types of ports can be defined: • Protected Port - Can send traffic only to uplink ports. • Community Port - A protected port that is associated with a community. It can send traffic to other protected ports in the same community and to uplink ports. • Uplink Port - An uplink port is an unprotected port that can send traffic to any port. • Isolated Port - A protected port that does not belong to a community. Port Protection is independent of all other features and configuration settings. Two protected ports in a common VLAN cannot communicate with each other. Protected Port Restrictions The following restrictions apply to protected ports: • When a protected port is placed in a LAG, it loses its protected port attribute and takes upon itself the LAG's protection attributes. When the port is removed from the LAG, its attributes are re-applied. • Mirrored traffic is not subject to protected ports rules. • Routing is not affected by the protected port forwarding rule, so that if a packet enters a protected port, it can be routed by the device to another protected port. 388 Dell PowerConnect 55xx Systems User Guide