Switch Management and Operating Concepts
—Destination only
—Source or Destination
•Physical port— Set Priority level for all ingress frames on a physical port
•
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.
Each port on the switch is a unique collision domain, and the switch filters (discards) packets whose destination lies on the same port as where it originated. This keeps local packets from disrupting communications on other parts of the network.
The switch does some filtering automatically:
•Dynamic
•Filtering done by the Spanning Tree
•Filtering done for VLAN
You can also manually configure the switch to drop packets from specified MAC and IP addresses. Whenever a switch encounters a packet originating from, or destined to, a MAC address or an IP address entered into the filter table, the switch discards the packet.
MAC Address Filtering
When filtering by MAC address, you have two options:
•
•
IP Address Filtering
When filtering by IP address, you have three options. You can have the switch drop the packet based on where the IP address appears in the
•Source
•Destination
•Source and destination
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