> On Jun 26, 2014, at 7:05 PM, Stig Venaas <[email protected]> wrote: > > Hi > >> On 6/20/2014 5:08 AM, David Barak wrote: >> >>>> On Jun 20, 2014, at 5:09 AM, Phil Mayers <[email protected]> wrote: >>>> >>>>> On 20/06/14 07:11, Mark Tinka wrote: >>>>> On Thursday, June 19, 2014 08:17:07 PM Stig Venaas wrote: >>>>> >>>>> I'm >>>>> hoping SSM will be the way to go for interdomain in >>>>> general. >>>> >>>> Agree - prefer SSM also. >>> >>> Who doesn't - app coders AFAICT? ;o) >> >> There are specific use cases for ASM (in IPv4) in distributed monitoring >> (many->few traffic flows) It sure would be a shame for that to go away... > > But do you need that across multiple domains?
Define "domain" in that context- do you mean PIM domain, or do you mean administrative control, ASN, MSDP relationship, or what? The answer to most of these would be "yes", although to varying degrees. > > ASM is pretty much the only solution when it comes to autoconfig > and discovery where you don't want to hard code source addresses > and some device has no knowledge. But that is typically relevant > on a single link, or in a site. I can't think of any interdomain > cases. Distributed sensor networks are a specific example of a multi-site use case for ASM. > > Applications that need to discover remote sources for SSM would > need to have their own discovery mechanism. There are various > possible schemes. A device with no info might need to use DHCP > or something to learn how to reach a server, or maybe have some > fixed multicast group to discover some kind of local server that > has more info. > But yes, it is easier for application developers to assume ASM > works inter-domain. Embedded-RP works though, but you would > probably not want to hardcode a group addresses with an embedded > RP address in a device. > I'm looking at perfectly functioning ASM networks in IPv4, and hoping the functionality doesn't go away or become a lot harder because v6 multicast is over designed. Right now, an app needs its own source address and the group or groups to send to, *and that's it*. Am I stuck with embedded-rp if we move to v6? What if (Heaven forfend) I want to change the rp address, or use BSR or something? David Barak Sent from a mobile device, please forgive autocorrection.
