from?sim.api?import?*
from?sim.basics?import?*
import?string

‘‘‘

Create?your?learning?switch?in?this?file.
‘‘‘
class?LearningSwitch（Entity）:
????def?__init__（self）:
????????self.forwardingtable?=?{};
????????
????def?handle_rx?（self?packet?port）:
????????
????????
????????if?packet?is?None?or?port?is?None:
????????????
????????????return
????????if?packet.dst?is?NullAddress?:
????????????
????????????return
????????if?self.get_port_count（）?==?0:
????????????
????????????return

????????if?packet.src?not?in?self.forwardingtable:?
????????????self.forwardingtable[packet.src]?=?port
????????????
????????if?packet.dst?not?in?self.forwardingtable:????
????????????self.send（packet?port?True）
????????????return
????????else:
????????????self.send（packet?self.forwardingtable[packet.dst]）
????
????def?handle_link_up?（selfportentity）:
????????pass
????????
????def?handle_link_down?（selfportentity）:
????????pass

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????文件????????926??2013-05-31?15:44??learning_switch.py

?????文件???????3657??2013-05-31?15:47??rip_router.py

?????文件??????47104??2013-05-31?15:51??程序說明&思路.doc

-----------?---------??----------?-----??----

????????????????51687????????????????????3