VSC7440 datasheet(315/444 Pages) MICROSEMI

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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

Ethernet

Switch

Ethernet

Switch

Ethernet

Switch

Ethernet

Switch

Ethernet

Switch

Ethernet

Switch

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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