Michael, thanks for your reply. But, this gives rise to couple of questions..
1] If such multicast routing protocol for IB routers is not yet specifid by IBTA or IETF, then current implementation have IP subnet restricted within a IB subnet. According to RFC 4391, section 9.1.1, the link layer address is formed through combination of GID + QPN. If we are not spanning across IB subnets what is the use of GID as we need to get LID from GID? Probably, in that case ARP reply with LID,Q_Key and other path information would be helpful which resolves path in 1 loop than 2 loops in case of GID(first to resolve GID and then to get LID). 2] When we look at code the dev->dev_addr is still made up of GID+QPN. What could be the purpose of having implementation this way if we can have dev->dev_addr made up of LID,Q_KEY etc with reference to point no 1 above? On 7/26/07, Michael S. Tsirkin <[EMAIL PROTECTED]> wrote: > > > Quoting Amar Mudrankit <[EMAIL PROTECTED]>: > > Subject: ARP in IPoIB > > > > Hello all, > > > > Being new to this group, following questions may sound a bit basic > level > > but I would be really very happy if somebody could help me out in those. > > > > 1] Does current implementation of IPoIB supports IP hosts spanning > different IB > > subnets? If so, how does it resolves the IP addresses(QPN+GID etc) > because how > > would the broadcast IP ( multicast IB) request would reach different IB > subnet > > as the router should have multicast routing capabilities? Does it mean > that the > > current IPoIB implementation is supported for hosts within single IB > subnet and > > not beyond that? > > > > 2] What is all-router multicast group(RFC-4391 section 10)? How does it > help in > > routing packet to a IP host present on different IB-subnet? > > Pls refer to this document: RFC 4393, IP over InfiniBand (IPoIB) > Architecture > Chapter 3.3. IP Subnets Across IB Subnets which has some answers to your > questions. > > Here's a link: > http://tools.ietf.org/html/rfc4392 > > -- > MST >
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