Expansion - Ethernet8-10Segmented EthernetIn cases where a Multichannel Ethernet network uses an EMM-E6 to providemanagement and bridging functions, there may be a Bridge/Router InterfaceModule (BRIM) slot available. If this is the case, a set of Token Ring In/Ring Out(RI/RO) ports can be configured in the EMM-E6, with a bridged connection to theEthernet segments of the chassis. The BRIM required to set up this connection isthe BRIM-T6. Note that the EMM-E6 is not, at this time, able to support more thanone BRIM.Incorporating FDDISince the Multichannel Ethernet network provides for the operation of theEthernet A Channel over the backplane, any modules which provide connectionto that backplane are capable of communicating with Multichannel Ethernetdevices being managed and bridged by an EMME or EMM-E6.The addition of FDDI stations or backbone connectivity to the chassis is as simpleas selecting the media to be used for the FDDI dual counterrotating ring (if any),which may be single mode fiber optics or multimode fiber optics, anddetermining if FDDI station connections are required. Since the FDDImanagement module produced by Cabletron Systems provides FDDI to Ethernetbridging, there are no specialty modules required, and the remainder of the FDDInetwork is approached in the same fashion as the design of a new FDDI network,as outlined in Chapter 7.If a connection of a dual counterrotating ring or a dual-homed connectionthrough A/B ports is required, a network using an EMM-E6 as a managementmodule or which includes an ESXMIM or ESXMIM-F2 supplies this through theaddition of a BRIM-F6. The EMM-E6 may not currently have more than one BRIMoperating at any given time.
