Conference irocz::common_brouters

921.0. "How many X.25 DA/DLM on RA Access/Central" by JOBURG::RYAN (There'll be days like this) Mon Jun 02 1997 08:21

    Hi,
    
    I couldn't quite figure it out from the documentation (manuals & spd). 
    
    I'd like to know how many X.25 DA/DLM circuits I can define on a
    RouteAbout  Access 90EW. I suppose at the same time the same
    information for the other  products in the range will be useful for
    future reference.
    
    Firstly, my understanding is that we only support 1 DLM per X.25 DTE
    using  Phase IV. is this correct ? (from the SPD - One X.25 SVC can be
    configured  for DLM on each physical interface)
    
    Secondly, I read in the SPD that with OSI, 31 Routing Circuits are
    supported,  including X.25, serial and broadcast circuits. Since the
    Access has 1  Ethernet, that leaves 30 circuits. Assuming I have just
    one X.25 connection (i.e. the second line is not in use), does that
    mean I can have 30 X.25 Routing Circuits (Static Incoming/Static
    Outgoing/Dynamically Assigned) ? Since static X.25 circuits 'plug-in'
    to Phase IV DLM's, can I configure my router to act as a central 'hub'
    with multiple 'Static Outgoing'  circuits to other RouteAbouts,
    WANrouter 90's and ageing VAXen ? Does a RouteAbout Central support
    more OSI Routing Circuits than an Access ?
    
    A table showing all the limits would be really neat. The WANrouter
    90/250 SPD has this table - perhaps you could include something like it
    in a future SPD.
    
    Table_2:_Routing_Circuits__________________________________________
    
                         Max       HDLC,
                 Sync    WAN       PPP,   X.25    X.25
     Hardware____Ports___Circuits__DDCMP__DA______DLM____FR_____________
     90          1       8         1      8       8      8
     90EW        2       9         2      8       8      8
     250_________8_______8_________8�_____8_______-______-______________
    
    regards                          
    Ryan
    NPBU, South Africa

	See note 907.

    OK, so I'm happy about only one Phase IV DLM.
    
    907 still doesn't tell me how many DA circuits I can define. It implies
    that it is not limited to only one like the Phase IV DLM, but
    doesn't answer my specific question about whether my understanding of
    the limitations is correct.
    
    So, I'm still in the dark about whether a Static Incoming/Outgoing
    circuit is the same as a Phase IV DLM with a one-per DTE restriction.
    The SPD implies that this is not the case, and that the Static or DA
    circuits can number up to (31 - (ethernet interfaces) - (serial
    interfaces)) = 30 (in my case), assuming you're using Link-state,
    not Routing Vector - OK so maybe the VAXen are out, but what about
    RouteAbouts & WANrouters.
    
    
    
    Ryan

        If you are happy running Link State, then the limit is the
        one given in the SPD: 31 total circuits per box, with no
        restriction on the number of DA/Static circuits per interface.

        This is the same for the Access or Central routers.

	The VAXen can participate as Phase IV endnodes on a LAN. The WR90,
	RA and DECnis should not be a problem as long as they are running
        LS routing too.