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VSC7440 Datasheet(PDF) 315 Page - Microsemi Corporation |
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VSC7440 Datasheet(HTML) 315 Page - Microsemi Corporation |
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315 / 444 page  Functional Descriptions VMDS-10492 VSC7440 Datasheet Revision 4.2 298 • Ethernet ring protection switching • Port protection switching • Linear protection switching for E-Lines Both ring protection and linear protection can also be supported over a link aggregation group (LAG). 3.34.1 Ethernet Ring Protection Switching When protection switching occurs in an Ethernet ring (ITU-T G.8032), the following actions must be taken to restore connectivity. • MAC addresses learned on the ring ports for the involved FIDs must be flushed from the MAC table. This is done using the scan functionality in the LRN block. Using ANA_L2:COMMON:SCAN_FID_CFG.SCAN_FID_VAL MAC, addresses for up to 16 FIDs can be flushed at a time. • The RPL port must be changed to forwarding state and ports interfacing to the failed link must be changed to blocking state. For rings supporting many VLANs, this can be done efficiently using VLAN TUPE. The following illustration shows an Ethernet ring protection example. Switch A is part of two rings, ring 1 and ring 2. Ring 1 uses 18 VIDs, VID 4-19 and 31-32, for forwarding traffic. Ring 2 uses 32 VIDs, VID 10- 30 and 40-50. To allow a VLAN TUPE command to identify the VIDs used by each of the two rings, a bit in the TUPE_CTRL field in the VLAN table is allocated for each of the two rings. In this example, ring 1 uses bit 0 in TUPE_CTRL, and ring 2 uses bit 1. Figure 97 • Ethernet Ring Protection Example The following table shows the configuration of the VLAN table of switch A. The VLAN_PORT_MASK bit shows only the value for the ring ports. For the other ports (ports 2-6), the VLAN_PORT_MASK bits are assumed to be 0. VID 4-9 and 31-32 are only used by ring 1, so only bit 0 is set in TUPE_CTRL. VLAN_PORT_MASK includes the two ring ports of ring 1, port 0, and port 1. Table 224 • VLAN Table Configuration Before APS Address (VID) TUPE_CTRL VLAN_PORT_MASK VLAN_FID 4-9 0x01 0x0003 4-9 10-19 0x03 0x0083 10-19 31-32 0x01 0x0003 31-32 20-30, 40-50 0x02 0x0080 20-30, 40-50 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 protectionlink (RPL) |
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