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-p...
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