HP StorageWorks MSA 2/8 HP StorageWorks Fabric OS 3.X Document Addendum (AA-RW - Page 152
Long-Distance Trunking
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ISL trunking user guide Add the following section at the end of Chapter 1: Long-Distance Trunking This section provides information on long-distance trunking between Fabric OS v3.2 switches, including the SAN Switch 2/8 EL and SAN Switch 2/16. Long-distance ISL trunking is a new feature for Fabric OS v3.2.x and Fabric OS v4.4.0. Long-Distance Trunking Requirements Requirements for ISL Trunking and Extended Fabrics in Fabric OS v3.2.x are as follows: ■ The ISL Trunking and Extended Fabrics licenses are required. ■ All trunk group ports must be part of the same quad. ■ All trunk group ports must be running at 2 Gbit/sec. ISL Trunking does not support 1 Gbit/sec speeds. ■ All trunk group ports must have similar deskew values. ■ ISL Trunking is automatically enabled between adjacent switches that support trunking. ■ All trunking ports in the same trunk group should be configured to be the same Extended Fabrics distance (for example, LD - LD, L0.5 - L0.5, or L1 - L1). ■ As the distance increases, more buffer credits are needed, and fewer ports can form a trunk group. ■ SAN Switch 2/8 EL and SAN Switch 2/16 ASICs limit buffer allocation to 63 maximum per port, so long-distance trunks can be established only up to this buffer limit. Long-Distance Trunking Summary The following is a summary of SAN Switch 2/8 EL and SAN Switch 2/16 long-distance settings and supported distances: ■ L0 less than or equal to 5 km and a 2-, 3-, or 4-port trunk group (normal distance trunking allocates 26 buffer credits across 4 data VCs) ■ LE less than or equal to 10 km and a 2-, 3-, or 4-port trunk group (allocates 19 buffer credits across VC2) ■ L0.5 less than or equal to 25 km and a 2- or 3-port trunk group (allocates 29 buffer credits across VC2) ■ L1 less than or equal to 50 km and a 2-port trunk group (allocates 54 buffer credits across VC2) ■ L2 less than or equal to 100 km (no trunking support) ■ LD less than or equal to 100 km (trunking supported at distances under 50 km) 152 Fabric OS 3.x Document Addendum