pexpect child.before与Cisco IOS的​​问题，而不是从命令获得结果

Question

所以我一直在努力解决这个问题，我似乎无法找到解决方案。 我正在telnet到cisco 7200路由器并试图获得几个BGP连接的状态，并且由于某种原因我只是得到了提示的开头。有关代码中注释失败的更多信息。

child = pexpect.spawn('telnet %s' % (host.gethostname()), maxread=16384)
#child.logfile = sys.stdout
#child delaybeforesend = 0
child.timeout = 200

child.expect('Username:')
child.sendline(username)
child.expect('Password:')
child.sendline(password)
child.expect('#')

#we should now be inside the router, time to find out what version it is running
print "Trying to detect router version"

child.sendline('show version')
status = child.expect(['#','--More--'])
tmp_holder = child.before <------- succesfully retrieving the router version information.

if status == 1:
     child.sendline('q')
     child.expect('#')

if "7200 Software" in tmp_holder:
     print "---Router Version CISCO 7200 Detected---"
     print "---Checking BGP status---"

     for neighbor in host.getbgpip():
         child.sendline('show bgp all neighbors %s ' % (neighbor))
         bgp_status = child.expect(['#', '--More--'])
         bgp_status_holder = child.before # <---this part is failing, not getting the return from show bgp all neigbors

         if bgp_status == 1:
            child.sendline('q')
            child.expect('#')

         if 'Established' in bgp_status_holder:
             print host.gethostname()+" established to "+neighbor
         elif 'Idle' in bgp_status_holder or "Active" in bgp_status_holder:
             print host.gethostname()+" not established to "+neighbor
         else:
             print host.gethostname()+" non existing neighbor: "+neighbor
         print bgp_status_holder
         #child.interact() <---if i activate this i get the result printed, plus i'm seeing the "--More--" that i'm trying to catch above.
     child.close()

如果我在尝试设置bgp_status_holder变量时使用child.after而不是child.before我只得到＃作为结果。