Netgear XCM8806 Chassis User Manual - Page 257
MAC Address Management in a PVLAN, Non-Isolated Subscriber VLAN
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NETGEAR 8800 User Manual the Network VLAN extension on Switch 3. Switch 3, Port 24 is configured as tagged and only accepts traffic with the Network VLAN Tag. Switch 3 serves as an extension of the Network VLAN and can be used to connect to network devices such as servers or an internet gateway. Switch 2, Port 22 supports the Network, NonIsolated, and Isolated VLANs, but no PVLAN is configured. Because Port 22 supports multiple VLANs that are part of the PVLAN, and because these Switch 2 VLANs are not part of the PVLAN, Switch 1, Port 24, must be configured as a PVLAN endpoint, which establishes the PVLAN boundary. Switch 2, port 22, is configured as a regular tagged VLAN port. For most applications, it would be better to extend the PVLAN to Switch 2 so that the PVLAN features are available to the Switch 2 VLANs. The configuration of Switch 2 behaves as follows: • The Switch 2 NonIsolated VLAN ports can communicate with the NonIsolated VLAN ports on Switch 1, but they cannot participate in VLAN translation. • The Switch 2 Isolated VLAN ports can communicate with other Switch 2 Isolated VLAN ports. • The Switch 2 Isolated VLAN ports cannot participate in VLAN translation. • The Switch 2 Isolated VLAN ports can receive broadcast and multicast info for the Isolated VLAN. • Traffic is allowed from the Switch 1 Isolated VLAN ports to the Switch 2 Isolated VLAN ports. MAC Address Management in a PVLAN Each device that connects to a PVLAN must have a unique MAC address within the PVLAN. Each MAC address learned in a PVLAN requires multiple FDB entries. For example, each MAC address learned in a non-isolated subscriber VLAN requires two FDB entries, one for the subscriber VLAN and one for the network VLAN. The additional FDB entries for a PVLAN are marked with the P flag in the show fdb command display. The following sections describe the FDB entries created for the PVLAN components and how to estimate the impact of a PVLAN on the FDB table: • Non-Isolated Subscriber VLAN on page 257 • Isolated Subscriber VLAN on page 258 • Network VLAN on page 258 • Calculating the Total FDB Entries for a PVLAN on page 258 Non-Isolated Subscriber VLAN When a MAC address is learned on a non-isolated subscriber VLAN port, two entries are added to the FDB table: • MAC address, non-isolated subscriber VLAN tag, and the port number • MAC address, network VLAN tag, port number, and a special flag for tag translation Chapter 9. VLANs | 257
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