IP175G datasheet(24/69 Pages) ETC2

24 / 69 page

IP175G/GI/GH/GHI

Data Sheet

24 / 69

November 27, 2012

IP175Gx-DS-R01.3

Source port ID

Trunk

Hashing

Trunk 0:

defines the group to be

forwarded

defines the group to

be forwarded

Packet

port1

port0

Trunk 1:

port3

port4

port5

(2 LSB)

(2 bits)

destination port shifted

due to un-link

Figure 12 Load Balance Block Diagram

Link aggregation example:

Here have two trunk groups.

Trunk 0: port 0, 1

Trunk 1: port 5, 6, 7

The link aggregation parameters are set as:

AGGR_MODE: The aggregation mode determines which index would be used to search aggregation

mask table. Here provide four ways:

The four LSB of the SMAC

The four LSB of the DMAC

The four LSB of the SMAC xor DMAC

Source port ID

PHY22 REG11[2:0] = 0x0

(AGGR_MODE = SMAC)

AGGR_IDX_SEL: Link aggregation function only uses a 3-bit index to search aggregation mask table. To

achieve it, the aggregation index selection is used to extract 3-bit index from the mentioned in

AGGR_MODE.

PHY22 REG11[4:3] = 0x0

(AGGR_IDX_SEL = index[2:0])

AGGR_GROUP: The port mask is logically grouping a set of ports.

PHY22 REG21[7:0] = 0x03

(AGGR_GROUP0: port 0 and port 1)

PHY22 REG22[7:0] = 0xe0

(AGGR_GROUP1: port 5, 6, 7)

Aggregation mask table:

PHY22 REG14[7:0] = 8’b0011_1101 (AGGR_MASK0)

PHY22 REG15[7:0] = 8’b0101_1110 (AGGR_MASK1)

PHY22 REG16[7:0] = 8’b1001_1101 (AGGR_MASK2)

PHY22 REG17[7:0] = 8’b0011_1110

(AGGR_MASK3)

PHY22 REG18[7:0] = 8’b0101_1101 (AGGR_MASK4)

PHY22 REG19[7:0] = 8’b1001_1110 (AGGR_MASK5)

PHY22 REG20[7:0] = 8’b0011_1101 (AGGR_MASK6)

PHY22 REG21[7:0] = 8’b0101_1110 (AGGR_MASK7)

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