diff --git a/test_data.py b/test_data.py
index 8eec806..e156006 100644
--- a/test_data.py
+++ b/test_data.py
@@ -26,4 +26,4 @@ distributionswitch = {
 	},
 }
 
-distswitch = vlanmang.SwitchConfig('192.168.0.58', 'private', distributionswitch)
+distswitch = vlanmang.SwitchConfig('192.168.0.58', 'private', distributionswitch, [ 'lag2' ])
diff --git a/vlanmang.py b/vlanmang.py
index 94c796b..81bca95 100644
--- a/vlanmang.py
+++ b/vlanmang.py
@@ -192,21 +192,31 @@ def getuntagged(data, lookupfun):
 class SNMPSwitch(object):
 	'''A class for manipulating switches via standard SNMP MIBs.'''
 
-	def __init__(self, host, community):
+	def __init__(self, host, auth):
 		self._eng = SnmpEngine()
-		self._cd = CommunityData(community, mpModel=0)
+		if isinstance(auth, str):
+			self._cd = CommunityData(auth, mpModel=0)
+		else:
+			self._cd = auth
 		self._targ = UdpTransportTarget((host, 161))
 
 	def _getmany(self, *oids):
-		oids = [ ObjectIdentity(*oid) for oid in oids ]
-		[ oid.resolveWithMib(_mvc) for oid in oids ]
+		woids = [ ObjectIdentity(*oid) for oid in oids ]
+		[ oid.resolveWithMib(_mvc) for oid in woids ]
 
 		errorInd, errorStatus, errorIndex, varBinds = \
-		    next(getCmd(self._eng, self._cd, self._targ, ContextData(), *(ObjectType(oid) for oid in oids)))
+		    next(getCmd(self._eng, self._cd, self._targ, ContextData(), *(ObjectType(oid) for oid in woids)))
 
 		if errorInd: # pragma: no cover
 			raise ValueError(errorIndication)
-		elif errorStatus: # pragma: no cover
+		elif errorStatus:
+			if str(errorStatus) == 'tooBig' and len(oids) > 1:
+				# split the request in two
+				pivot = len(oids) / 2
+				a = self._getmany(*oids[:pivot])
+				b = self._getmany(*oids[pivot:])
+				return a + b
+
 			raise ValueError('%s at %s' %
 			    (errorStatus.prettyPrint(), errorIndex and
 			    varBinds[int(errorIndex)-1][0] or '?'))
@@ -346,6 +356,11 @@ if __name__ == '__main__': # pragma: no cover
 	import sys
 
 	changes, switch = checkchanges('data')
+
+	if not changes:
+		print 'No changes to apply.'
+		sys.exit(0)
+
 	pprint.pprint(changes)
 
 	res = raw_input('Apply the changes?  (type yes to apply): ')
@@ -355,18 +370,20 @@ if __name__ == '__main__': # pragma: no cover
 
 	print 'applying...'
 	failed = []
-	for verb, vlan, arg, oldarg in changes:
-		print '%s: %s %s' % (verb, vlan, `arg`)
+	for verb, arg1, arg2, oldarg in changes:
+		print '%s: %s %s' % (verb, arg1, `arg2`)
 		try:
+			fun = getattr(switch, verb)
+			fun(arg1, arg2)
 			pass
 		except Exception as e:
 			print 'failed'
-			failed.append((verb, vlan, arg, e))
+			failed.append((verb, arg1, arg2, e))
 
 	if failed:
 		print '%d failed to apply, they are:' % len(failed)
-		for verb, vlan, arg, e in failed:
-			print '%s: %s %s: %s' % verb, vlan, arg, `e`
+		for verb, arg1, arg2, e in failed:
+			print '%s: %s %s: %s' % (verb, arg1, arg2, `e`)
 
 class _TestMisc(unittest.TestCase):
 	def setUp(self):