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 53 page image

SmartSwitch ATM User Guide 3-9PNNI Routing Managing Parallel PNNI Links3.3 MANAGING PARALLEL PNNI LINKSATM SmartSwitches can be connected by more than one physical link. PNNI treats these connections as parallelphysical links. By default, parallel links are considered to have equal capabilities with regard to call set ups.For example, if a second link is added between switch SWA3 and switch SWB3 (from the example above), this parallellink can be seen using the show pnnilink command.SWA3 # show pnnilinkNum(ALL) :Num Port Node Remote Node Hello State Link TypeNumber Index IP Addr===========================================================================1 7A1 1 206.61.237.20 2WayInside Lowest Level Horizontal Link2 7A3 1 206.61.237.19 2WayInside Lowest Level Horizontal Link3 7B1 1 206.61.237.23 CommonOut Outside and Uplink4 7B2 1 206.61.237.23 CommonOut Outside and Uplink — Second physical link to B35 -- 2 N/A 2WayInside Horizontal Link to/from LGN6 -- 2 N/A 2WayInside Horizontal Link to/from LGN — Second logical link to B3SWA3 #You can adjust the advertised capabilities of each link (on a per-port, per-service class basis) by changing the link’sadministrative weights. Use the show pnniinterface command to view the current administrative weights. Forexample:SmartSwitch # show pnniinterfacePortNumber(ALL) :Port Admin Wt Admin Wt Admin Wt Admin Wt Admin Wt AggregationNumber CBR RTVBR NRTVBR ABR UBR Token================================================================================CPU 5040 5040 5040 5040 5040 0CPU.1 5040 5040 5040 5040 5040 07A1 5040 5040 5040 5040 5040 07A2 5040 5040 5040 5040 5040 07A3 5040 5040 5040 5040 5040 07A4 5040 5040 5040 5040 5040 07B1 5040 5040 5040 5040 5040 17B2 5040 5040 5040 5040 5040 07B3 5040 5040 5040 5040 5040 0SmartSwitch #A link’s administrative weight defines its desirability to the PNNI routing service when setting up a call of a particularclass of service. The lower the numerical value of the administrative weight, the more desirable the route. For example,a route with administrative weight 200 for a particular class of service is considered a better route than one with thedefault weight of 5040 for that service. As a result, the administrative weight provides a quantitative way to controlwhich routes are favored for call set up with regard to service class.The ability to control the PNNI routing service in this fashion allows for parallel routes to be weighted such that onelink is designated as the favored for a particular service class, while a parallel link can be designated as the favoredroute for a different service class.