Oops.. I read the GENI document again, and Murphy is right in that the multicast address is different here. My apologies.
This address will be forwarded by mac bridges though. Won't this be risking a broadcast storm? Am I missing something again? Regards KK On 14 July 2011 13:23, kk yap <yap...@stanford.edu> wrote: > I believe OFDP uses LLDP as Kyriakos mentioned. So, there is no real > difference here. > > As for the question of discovering a "link" between two OpenFlow > switches connected by a non-OpenFlow switch, the link will be > discovered if the switch does not process LLDP and thus pass it on. > Else, the intermediate switch will consume the LLDP packet. > > For discovery of only OpenFlow switches, it might be best to use a > packet with multicast address (and possibly ethertype) that is > different from LLDP (i.e., 802.11ab). The change is not hard but note > the consequences. > > Just my two cents worth. > > Regards > KK > > 2011/7/14 Murphy McCauley <jam...@nau.edu>: >> Right. Someone correct me if I am wrong here, but really the only >> difference between OFDP and normal LLDP is that OFDP uses a normal multicast >> address so that it can see connectivity across non-OpenFlow switches. >> The purpose being... if you have two OpenFlow switches connected via an >> intermediate non-OpenFlow switch, using normal LLDP, you couldn't tell that >> the two OpenFlow switches were connected because the intermediate switch >> would not forward the LLDP packet. "OFDP" style LLDP *does* get forwarded >> by the intermediate, so you *can* tell that the two OpenFlow switches are >> connected. >> -- Murphy >> On Jul 14, 2011, at 1:45 AM, Kyriakos Zarifis wrote: >> >> OFDP is a made-up term used to describe how OF uses LLDP packets to perform >> discovery. There is no such thing as an OFDP packet. The packets used for >> discovery are LLDP packets. >> On Thu, Jul 14, 2011 at 4:32 AM, wunyuan <wuny...@nchc.narl.org.tw> wrote: >>> >>> Hi, >>> >>> Thanks for your answer. >>> >>> We observe the information from this URL >>> (http://groups.geni.net/geni/wiki/OpenFlowDiscoveryProtocol) >>> >>> this information is that OFDP advertisements are sent to a "normal" >>> multicast MAC (01:23:00:00:00:01), and we find our openflow switch send the >>> lldps to this mac. >>> >>> We guess the discovery is the OFDP first. >>> >>> We think our guess may be wrong after we see the discovery.py code. >>> >>> Therefore, we are not sure that the discovery is the LLDP or the OFDP now. >>> >>> Bests, >>> >>> Wun-Yuan >>> >>> >>> >>> 於 2011/7/14 下午 04:03, Kyriakos Zarifis 提到: >>> >>> Hi, >>> I'm not sure if I understand the question, but Discovery uses LLDP >>> packets. >>> Short description here: >>> http://noxrepo.org/noxwiki/index.php/Discovery >>> >>> On Thu, Jul 14, 2011 at 3:43 AM, wunyuan <wuny...@nchc.narl.org.tw> wrote: >>>> >>>> Hi, >>>> >>>> We have a question about the nox discovery. >>>> >>>> Our NOX version is NOX 0.9.0(zaku) in our openflow enviroment. >>>> >>>> We monitor a port of a openflow by wireshark, and we observe that the >>>> lldp packets are sent to a multicast MAC (01:23:00:00:00:01). >>>> >>>> However we see the discovery.py code and find that it isn't like the >>>> OFDP. >>>> >>>> We also monitor the ports of the other OF switch not directly-connected >>>> above openflow switches, but we only see the lldp packets sent by itself >>>> and >>>> the lldp packets receviced from neighbor. >>>> >>>> The discovery seem the LLDP. >>>> >>>> Which one is the discovery, the LLDP or OFDP? >>>> >>>> Thanks. >>>> >>>> Wun-Yuan >>>> _______________________________________________ >>>> nox-dev mailing list >>>> nox-dev@noxrepo.org >>>> http://noxrepo.org/mailman/listinfo/nox-dev >>> >>> >> >> _______________________________________________ >> nox-dev mailing list >> nox-dev@noxrepo.org >> http://noxrepo.org/mailman/listinfo/nox-dev >> >> >> _______________________________________________ >> nox-dev mailing list >> nox-dev@noxrepo.org >> http://noxrepo.org/mailman/listinfo/nox-dev >> >> > _______________________________________________ nox-dev mailing list nox-dev@noxrepo.org http://noxrepo.org/mailman/listinfo/nox-dev
