builds IGP topology off JNPR

getTopology.rb

#!/usr/bin/env ruby

require 'ntt/junos/xmlssh'
require 'pry'

class GetTopology
  HOST    = 'r00.testtx09.us.bb'
  COMMAND = 'show isis database detail'

  attr_reader :nodes, :edges

  def initialize
    xml = NTT::JunOS::XMLSSH.run host: HOST, command: COMMAND
    @nodes, @edges = parse_xml xml
  end

  private

  def parse_xml xml
    nodes, edges = [], []
    xml.xpath('///isis-database-entry').each do |node|
      name = clean_name node.at_xpath('lsp-id').content
      nodes << name
      node.xpath('isis-neighbor').each do |neighbor|
        peer   = clean_name neighbor.at_xpath('is-neighbor-id').content
        metric = neighbor.at_xpath('metric').content.to_i
        edges << {
          src: name,
          dst: peer,
          metric: metric,
        }
      end
    end
    [nodes, edges]
  end

  def clean_name name
    name = name.split('.')[0..-2].join('.')
    name = name[0..-5] if name[-4..-2] == '-re'
    name
  end
end

if $0 == __FILE__
  topo = GetTopology.new
  binding.pry
end