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VSC7440 Datasheet(PDF) 316 Page - Microsemi Corporation |
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VSC7440 Datasheet(HTML) 316 Page - Microsemi Corporation |
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316 / 444 page  Functional Descriptions VMDS-10492 VSC7440 Datasheet Revision 4.2 299 VID 10-19 are used by both ring 1 and ring 2, so bit 0 and bit 1 are both set in TUPE_CTRL. VLAN_PORT_MASK includes the ring ports of ring 1 as well as port 7, used by ring 2. Port 8 is not included, because it is in blocking state. VID 20-30 and 40-50 are only used by ring 2, so only bit 1 is set in TUPE_CTRL. VLAN_PORT_MASK includes port 7. In this example, independently learning is used for all VLANs; that is, a separate FID is used for each VID. To also block reception of frames on any blocking ports, ANA_L3:COMMON:VLAN_FILTER_CTRL must be configured to include all ring ports. In this example ports 0,1,7 and 8 must be set in ANA_L3:COMMON:VLAN_FILTER_CTRL. The following illustration shows the same set up as the previous illustration, but now a link in ring 2 has failed. As a result, the RPL of ring 2 must be activated, meaning port 8 of switch A must be changed to forwarding state. Figure 98 • Ethernet Ring with Failure To avoid having to perform write access to the VLAN_PORT_MASKs of each of VID 10-30 and 40-50, VLAN TUPE can be used instead. The following table lists the VLAN TUPE parameters to reconfigure the VLAN table. Table 225 • VLAN TUPE Command for Ring Protection Switching Field Value Comment TUPE_CTRL_BIT_MASK 0x0002 Bits 0 and 1 of TUPE_CTRL are used as bit mask. The TUPE command is applied only to VIDs used by ring 2, so only bit 1 is set. TUPE_CTRL_BIT_ENA 1 Enables use of TUPE_CTRL_BIT_MASK. TUPE_START_ADDR 10 To make VLAN TUPE complete faster, only cover VID 10-50. TUPE_END_ADDR 50 TUPE_CMD_PORT_MASK_SET 0x0100 Enables forwarding on port 8. TUPE_START 1 Starts VLAN TUPE. The device clears TUPE_START when TUPE is completed. Ethernet Switch A 0 1 2 3 4 5 6 Ethernet Switch B Ethernet Switch C Ethernet Switch D 7 8 Ethernet Switch E Ethernet Switch F Ethernet Switch G Ring protection link (RPL) Ring 1 VLANs: 4-19, 31-32 Ring 2 VLANs: 10-30, 40-50 RPL port Ring protection link (RPL) Link failure! |
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