Thank you for your reply. When I change the switch into router, it will have many ports. Can I get MAC address of every port ?
2011/7/13 Junlong <[email protected]> > I think you mean that how to get the MAC address for a port within the > switch. According to the Spec_v1.1, it's defined in ofp_port structure which > can be sent to the controller in an OFPT_FEATURES_REPLY message(A.3.1 > Handshake) > > /* Switch features. */ > struct ofp_switch_features { > struct ofp_header header; > uint64_t datapath_id; > /* Datapath unique ID. The lower 48-bits are for > a MAC address, while the upper 16-bits are > implementer-defined. */ > uint32_t n_buffers; /* Max packets buffered at once. */ > uint8_t n_tables; /* Number of tables supported by datapath. */ > uint8_t pad[3]; /* Align to 64-bits. */ > /* Features. */ /* Bitmap of support "ofp_capabilities". */ > uint32_t capabilities; > uint32_t reserved; > /* Port info.*/ > struct ofp_port ports[0]; > /* Port definitions. The number of ports > is inferred from the length field in > the header. */ > }; > OFP_ASSERT(sizeof(struct ofp_switch_features) == 32); > > > BTW, in the following paragraph, it says: > The datapath_id field uniquely identifies a datapath. The lower 48 bits are > intended for the switch MAC > address, while the top 16 bits are up to the implementer. > > So it can also help you to "get the MAC address of switch" > > > On Mon, Jul 11, 2011 at 9:19 PM, hzy <[email protected]> wrote: > >> I am doing excercise “Create Router” on web >> http://www.openflow.org/wk/index.php/OpenFlow_Tutorial#Create_Router >> I am running into trouble, when I am dealing with ARP. >> When the controller receives a arp request, it first check the arp table >> to get destinate MAC address. If the check is succeed, the controller >> contructs a arp reply back to the host sending the arp request. If not, the >> controller should flood the arp request.(If this process is not correct, >> please tell me.) >> >> My question is that, when I flood the arp request, I need to change the >> source MAC address to the switch's(the switch receiving the arp request). >> How can I get the MAC address of switch? >> (is there a parameter? something like "dpid" mark the switch id.) >> >> Thanks >> -hzy >> >> _______________________________________________ >> openflow-discuss mailing list >> [email protected] >> https://mailman.stanford.edu/mailman/listinfo/openflow-discuss >> >> > > > -- > > ***Best regards, :-) > > ** > Junlong Peng* > > >
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