VSC7440 datasheet(143/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

126

3.17.1

Private VLAN

In a Private VLAN (PVLAN), ports are configured to be one of three different types: Promiscuous,

isolated, or community.

Promiscuous Ports A promiscuous port can communicate with all ports in the PVLAN, including the

isolated and community ports.

Isolated Ports An isolated port has complete Layer 2 separation from the other ports within the same

PVLAN, but not from the promiscuous ports. PVLANs block all traffic to isolated ports except traffic from

promiscuous ports. Traffic from isolated port is forwarded only to promiscuous ports.

Community Ports Community ports communicate among themselves and with the PVLAN’s

promiscuous ports. Community ports cannot communicate with isolated ports.

PVLAN can be enabled per VLAN, and port type can be configured per physical port.

3.17.2

VLAN Pseudo Code

The pseudo code for the ingress VLAN processing is shown below. For routed frames, an egress VLAN

processing also takes place. This is not part of the following pseudo code.

In the pseudo code, “csr.” is used to denote configuration parameters, “req.” is used to denote input from

previous processing steps in the analyzer, as well as information provided for the following steps in the

analyzer.

if (req.cpu_inject != 0) {

// cpu_inject => Bypass!

return;

}

if (csr.vlan_ena) {

// Get VLAN entry based on Classified VID

igr_vlan_entry = csr.vlan_tbl[req.ivid + req.vsi_ena*4096];

} else {

// Default VLAN entry

igr_vlan_entry.vlan_mstp_ptr

= 0;

igr_vlan_entry.vlan_fid

= 0;

igr_vlan_entry.vlan_sec_fwd_ena = 0;

igr_vlan_entry.vlan_flood_dis

= 0;

igr_vlan_entry.vlan_lrn_dis

= 0;

igr_vlan_entry.vlan_rleg_ena

= 0;

igr_vlan_entry.vlan_private_ena = 0;

igr_vlan_entry.vlan_mirror_ena

= 0;

igr_vlan_entry.vlan_port_mask

= -1; // All-ones

igr_vlan_entry.vmid

= 0;

}

// Retrieve MSTP state

if (csr.vlan_ena) {

igr_mstp_entry = csr.mstp_tbl[igr_vlan_entry.vlan_mstp_ptr];

} else {

igr_mstp_entry.mstp_fwd_mask = -1; // All-ones

igr_mstp_entry.mstp_lrn_mask = -1; // All-ones

}

if (IsCpuPort(req.port_num) ||

IsVD0(req.port_num) ||

IsVD1(req.port_num)) {

// Received from CPU or VD0/VD1 =>

// * Do not learn

// * Do not perform ingress filtering

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