Cisco-ios-configをtextfsmでパースする

Cisco-iosの[show ip eigrp topology all-lins]の結果を、textfsm+ntc-templatesでパースする。

• textfsmでパースエラーが出たので、デバック出力を追加したモジュールを作成
• デフォルトのテンプレート[cisco_ios_show_ip_eigrp_topology.template]が未対応だったので、修正

ntc-templates
textfsm
Gist

textfsm

エラートレースを参考に、呼出前にテンプレート、入力ファイルの内容をSTDERR出力する。

    for line in lines:
      print >> sys.stderr, "DBG1:" , line
      self._CheckLine(line)
 
    for rule in self._cur_state:
      matched = self._CheckRule(rule, line)
      print >> sys.stderr, "DBG2:" , line , "->" , rule
      if matched:
        for value in matched.groupdict():
          self._AssignVar(matched, value)

        print >> sys.stderr, "DBG3:" , rule
        if self._Operations(rule):

diff結果

$ diff textfsm.py.org textfsm.py
1c1
< #!/usr/bin/python2.4
---
> 
853a854
>       print >> sys.stderr, "DBG1:" , line
872a874
>       print >> sys.stderr, "DBG2:" , line , "->" , rule
876a879
>         print >> sys.stderr, "DBG3:" , rule

ntc-templates

• ADV_ROUTEがConected, Rstatic(nn/mm)に対応していなかたので、修正
• P ip/maskl, xxx successors, FD is yyy, serno nnにも対応

# Value List ADV_ROUTER (\d+\.\d+\.\d+\.\d+\s+\(\d+\/\d+\))
Value List ADV_ROUTER ((\d+\.\d+\.\d+\.\d+\s+\(\d+\/\d+\))|\w+|(\w+\s+\(\d+\/\d+\)))

Start
  # Matches a route and captures if ${TAG} is use for the route and then moves to Gateway section
  ^${CODE}\s+${ROUTE}/${MASK},\s+${SUCCESSORS}\s+successors,\s+FD\s+is\s+${FD},\s+tag\s+is\s+${TAG} -> Gateway
  ## -- hiroshi : tag -> serno
  ^${CODE}\s+${ROUTE}/${MASK},\s+${SUCCESSORS}\s+successors,\s+FD\s+is\s+${FD},\s+serno\s+${TAG} -> Gateway

Gateway
  ## -- hiroshi
  # These are the same as above and capture the next set of routes
  ^${CODE}\s+${ROUTE}/${MASK},\s+${SUCCESSORS}\s+successors,\s+FD\s+is\s+${FD},\s+tag\s+is\s+${TAG}
  ^${CODE}\s+${ROUTE}/${MASK},\s+${SUCCESSORS}\s+successors,\s+FD\s+is\s+${FD},\s+serno\s+${TAG}

$ diff cisco_ios_show_ip_eigrp_topology.template.org cisco_ios_show_ip_eigrp_topology.template
9c9,13
< Value List ADV_ROUTER (\d+\.\d+\.\d+\.\d+|\w+)
---
> # 0.0.0.0 (fdval/adval)
> # Connected
> # Rstatic (fdval/adval)
> # Value List ADV_ROUTER (\d+\.\d+\.\d+\.\d+\s+\(\d+\/\d+\))
> Value List ADV_ROUTER ((\d+\.\d+\.\d+\.\d+\s+\(\d+\/\d+\))|\w+|(\w+\s+\(\d+\/\d+\)))
20a25,26
>   ## -- hiroshi : tag -> serno
>   ^${CODE}\s+${ROUTE}/${MASK},\s+${SUCCESSORS}\s+successors,\s+FD\s+is\s+${FD},\s+serno\s+${TAG} -> Gateway
29a36
>   ## -- hiroshi  
30a38
>   ^\s+via\s+${ADV_ROUTER}${OUT_INTERFACE}?
34a43,44
>   ## -- hiroshi
>   ^${CODE}\s+${ROUTE}/${MASK},\s+${SUCCESSORS}\s+successors,\s+FD\s+is\s+${FD},\s+serno\s+${TAG}