Ah, sorry. Resurrected an old one there... ;-/ /jgk
On 11/15/13 2:41 PM, John Kemp wrote: > > I know Carlos did a bunch of work to build this > into Netdot, i.e. discover L2, draw usable graphs. > > Here's a link to the last NANOG presentation: > > http://www.nanog.org/meetings/nanog49/presentations/Tuesday/Vicente-netdot-presentation-nanog49.pdf > > John Kemp > > On 10/15/08 7:18 PM, Dale W. Carder wrote: >> >> On Oct 15, 2008, at 1:35 PM, Colin Alston wrote: >> >>> On 2008/10/15 06:29 PM Colin Alston wrote: >>>> Is there any kind of cunning trick to detect standard layer2 switches >>>> along a path without stuff like STP? >>> >>> Apparently there isn't. Lots of people mentioned other tools, the >>> problem there is they have one thing in common which is polling SNMP. >>> I think it scales badly in general. >> >> What is your reasoning behind this claim? I would claim >> quite the opposite compared to CLI or TL1. >> >>> Maybe there should be something (I mean like, someone should come up >>> with a standard :P) to trace switches in a path >> >> I've written a cruddy script that given a seed bridge, scrapes >> L2 information obtained via CDP (I guess it could do LLDP, too) >> and does a breadth-first search through a network. Then I just >> dump that into gnuplot format. Getting the data is easy compared >> to visualization. >> >> A coworker of mine has written script to ask Rapid-STP speaking >> switches about their current topology and builds a graph again >> in gnuplot format. >> >> A more challenging approach would be to scrape the mac forwarding >> tables and stitch things together. This would have to be done >> per-vlan. I think this approach (or similar) might be done by >> Openview's L2 featureset. >> >> Dale >> >> -- >> Dale W. Carder - Network Engineer >> University of Wisconsin / WiscNet >> http://net.doit.wisc.edu/~dwcarder >> >> >
