Cabletron Systems SmartSwitch 04-0053-01 User Manual

Also see for SmartSwitch 9A100: User guide Upgrade instructions Installation and setup guide

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Cabletron Systems SmartSwitch 04-0053-01 User Manual Manual pdf 34 page image

2-16 SmartSwitch ATM User GuideCreating an Emulated LAN IP Over ATM and LANECurrently, the SmartSwitch 6500 is the only SmartSwitch ATM switch that supports logical multicasting. For thisreason, if you are connecting to LANE services across an ATM WAN using multiple PVPs and if client join requestsfor the same ELAN are received over different PVPs, you must use a SmartSwitch 6500 as the LANE services switch.If on the other hand, your WAN connection consists of a single PVP, any of the SmartSwitch ATM switches can beused as the LANE services switch.The rules for selecting the appropriate SmartSwitch ATM switch for providing LANE services across an ATM WANare summarized below:• A single PVP connection terminated on the LANE server switch with a single virtual port — AnySmartSwitch ATM switch as the LANE server (physical BUS multicasting)• Multiple PVP connections terminated on the LANE server switch through virtual ports on the samephysical port, where each PVP supports client connection requests for separate ELANs — AnySmartSwitch ATM switch (physical BUS multicasting)• Multiple PVP connections terminated on the LANE server switch through virtual ports on differentphysical ports — Any SmartSwitch ATM switch (physical BUS multicasting)• Multiple PVP connections terminated on the LANE server switch through virtual ports on the samephysical port, where each PVP supports client connection requests for the same ELAN —SmartSwitch 6500 only (logical BUS multicasting required).2.2.7 Using LNNISmartSwitch ATM switches provide support for LNNI. LNNI gives LANE redundancy and load-sharing capabilitiesby allowing multiple LECSs to exist on the same network, and by allowing multiple LES/ BUSs and SMSs to servicethe same ELANs.Note For an explanation of all LNNI related commands and parameters, see theSmartSwitch ATM Switch Reference Manual.LANE Service RedundancyAs many as eight (8) LECSs (one per SmartSwitch ATM switch) can be deployed on the same network; each LECScan support multiple ELANs. This is especially useful on large, mission-critical networks and eliminates the possibilityof the LECS being a potential single point-of-failure. If, for some reason, LANE services go down on a particularswitch, the clients that this switch supports can reestablish their connection to their ELAN through one of the otherLECSs (see Figure 2-3).