mininet.link.Link

表示基本的一条链路，最基本的链路在 mininet 中其实就是一对 veth 接口对。
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def __init__( self, node1, node2, port1=None, port2=None,
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                  intfName1=None, intfName2=None,
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                  intf=Intf, cls1=None, cls2=None, params1=None,
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                  params2=None ):
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        """Create veth link to another node, making two new interfaces.
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           node1: first node
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           node2: second node
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           port1: node1 port number (optional)
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           port2: node2 port number (optional)
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           intf: default interface class/constructor
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           cls1, cls2: optional interface-specific constructors
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           intfName1: node1 interface name (optional)
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           intfName2: node2  interface name (optional)
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           params1: parameters for interface 1
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           params2: parameters for interface 2"""
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        # This is a bit awkward; it seems that having everything in
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        # params would be more orthogonal, but being able to specify
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        # in-line arguments is more convenient!
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        if port1 is None:
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            port1 = node1.newPort()
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        if port2 is None:
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            port2 = node2.newPort()
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        if not intfName1:
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            intfName1 = self.intfName( node1, port1 )
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        if not intfName2:
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            intfName2 = self.intfName( node2, port2 )
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​
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        self.makeIntfPair( intfName1, intfName2 )
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​
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        if not cls1:
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            cls1 = intf
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        if not cls2:
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            cls2 = intf
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        if not params1:
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            params1 = {}
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        if not params2:
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            params2 = {}
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​
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        intf1 = cls1( name=intfName1, node=node1, port=port1,
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                      link=self, **params1  )
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        intf2 = cls2( name=intfName2, node=node2, port=port2,
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                      link=self, **params2 )
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​
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        # All we are is dust in the wind, and our two interfaces
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        self.intf1, self.intf2 = intf1, intf2
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创建链路时，需要在两个节点上分别生成两个端口，利用节点和端口，获取对应的两个网络接口的名称，例如 s1-eth0 和 h1-eth0，然后调用 makeIntfPair() 方法，最终调用 util.py 中的 makeIntfPair() 方法，调用系统中的 ip link 命令来创造一对 veth pair。
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def makeIntfPair( intf1, intf2 ):
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    """Make a veth pair connecting intf1 and intf2.
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       intf1: string, interface
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       intf2: string, interface
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       returns: success boolean"""
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    # Delete any old interfaces with the same names
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    quietRun( 'ip link del ' + intf1 )
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    quietRun( 'ip link del ' + intf2 )
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    # Create new pair
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    cmd = 'ip link add name ' + intf1 + ' type veth peer name ' + intf2
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    return quietRun( cmd )
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mininet.link.Intf

mininet.link.TCIntf

Last modified 2yr ago

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