nanog mailing list archives
Re: Network topology [Solved]
From: John Kemp <kemp () network-services uoregon edu>
Date: Fri, 15 Nov 2013 14:41:29 -0800
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 pathI'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
Current thread:
- Re: Network topology [Solved] John Kemp (Nov 15)
- Re: Network topology [Solved] John Kemp (Nov 15)