[HECnet] Network topology according to MIM.

[Robert Armstrong]

What happens if you make the cost on the LEGATO link 2 instead of 1?

The cost on my Multinet links are all set to 2. Since your current LEGATO cost is 1, the total cost of that path to area 59 is 3.  The exactly equals the cost on you UNA circuit.  In the case of a tie on cost, DECnet picks the router with the lowest numerical address, hence LEGATO wins.

But if you up the IP-0-0 cost to 2, the total would become 4 and the UNA would win.

Bob

On Jan 14, 2016 18:52, Johnny Billquist <bqt at softjar.se> wrote:
>
> Just FYI. It is slightly interesting and informing: 
>
> 15-JAN-16   03:44:30 Node: MIM   (1.13) "RSX system at Update, Sweden" 
>                   RSX-11M-Plus, Area Routing Node, DECnet V4.6 
> Area Circuit Hop/Cst   Next Node        Area Circuit Hop/Cst   Next Node 
>   2 IP-0-0     1/1    LEGATO( 2.1) 
>   3 IP-0-0     2/3    LEGATO( 2.1) 
>   7 UNA-0      2/7    SG1   (19.41) 
>   8 UNA-0      1/3    GORVAX( 8.400) 
> 12 UNA-0      2/13         ( 1.1023) 
> 14 UNA-0      1/3    SKHNGW(14.4) 
> 18 IP-0-0     2/3    LEGATO( 2.1) 
> 19 UNA-0      1/3    SG1   (19.41) 
> 22 UNA-0      2/23   HUB   (42.1022) 
> 23 UNA-0      2/13         ( 1.1023) 
> 33 IP-0-0     2/3    LEGATO( 2.1) 
> 39 IP-0-0     2/3    LEGATO( 2.1) 
> 42 UNA-0      1/3    HUB   (42.1022) 
> 44 UNA-0      1/3    A44RTR(44.1023) 
> 59 IP-0-0     2/3    LEGATO( 2.1) 
> 61 UNA-0      2/23   HUB   (42.1022) 
> 62 UNA-0      1/3    CTAKAH(62.637) 
>   - Total areas: 17- 
>
> Notice the number of areas that MIM now decided should go over IP-0-0, 
> which is the link to LEGATO. Since I set the cost for that link to 1, 
> while ethernet is at 3, it is rather favored. Not sure it really makes 
> sense to route packets to area 59 that way, since going over ethernet, I 
> would have a direct ptp to area 59 through a Cisco router sitting right 
> next to MIM, but that then becomes a question of what the cost of the 
> link between 1.1023 and area 59 is set to. 
>
> Johnny 
>
> -- 
> Johnny Billquist                  || "I'm on a bus 
>                                    ||  on a psychedelic trip 
> email: bqt at softjar.se             ||  Reading murder books 
> pdp is alive!                     ||  tryin' to stay hip" - B. Idol 
>