HP StorageWorks 4000/6000/8000 .HP StorageWorks SAN Design Reference Guide, Pa - Page 120

WWNs Maximum number of total domains per backbone fabric Maximum number of local WWNs per backbone fabric 42 512 (32 edge fabrics) 1,280 (1 edge fabric) Hop count scalability Hop count Maximum number of hops between switches (including routers) in a Meta SAN (Figure 12 45) 400 MP Router and MP Router Blade hop count The 400 MP Router and MP Router Blade are counted in the same way as a Fibre Channel switch when determining the fabric hop count (Figure 45 on page 126). Devices communicating across fabrics through an MP Router must adhere to both the B-series 7-hop limit within an edge fabric and the MP Router 12-hop limit . 400 MP Router and MP Router Blade usage Use an MP Router Blade: • If you want to add multiple fabrics to a Meta SAN, and one of those fabrics contains a 4/256 SAN Director, DC SAN Backbone Director, or DC04 SAN Director with an available slot for an MP Router Blade NOTE: All devices connected to the SAN Director Fibre Channel ports are part of a backbone fabric. • If you want to share up to 256 local devices in a backbone fabric with multiple edge fabrics • For FCIP, if there are 4/256 SAN Directors, DC SAN Backbone Directors, or DC04 SAN Directors at both the local site and remote site Use a 400 MP Router: • If you do not have a 4/256 SAN Director, DC SAN Backbone Director, or DC04 SAN Director, and do not plan to use one • If you have a 4/256 SAN Director, DC SAN Backbone Director, or DC04 SAN Director, and do not want to use it as a backbone fabric • For FCIP, if there are no 4/256 SAN Directors, DC SAN Backbone Directors, or DC04 SAN Directors at the local site or remote site For use-case configuration examples, see the 400 MP Router and MP Router Blade use-case white papers at http://h18006.www1.hp.com/storage/sanwhitepapers.html?jumpid=reg_R1002_USEN. 120 B-series switches and fabric rules