Re: filtering long prefixes
Yes, Geert Jan, but if you look at the list I prepared, you'll note that the only chunks of old style Bs that are 18-bits long all come from one home-AS and most are in a pair of old-style class Bs which easily could be aggregated into a single /15 with the loss of some routing specificity (which is lost anyway when that provider's internal metrics don't propagate to its external peers). The remainder of the 'chunks' of old style Bs are all longer than 18 bits, and most are /24s or /26s, and I see none at all that appear difficult to aggregate, or which look like anything other than leaks due to misconfiguration. If you get to the point where someone needs to have a /18 in the old-style class B space and it can't be aggregated, we can return to this. Sean.
Yes, Geert Jan, but if you look at the list I prepared, you'll note that the only chunks of old style Bs that are 18-bits long all come from one home-AS and most are in a pair of old-style class Bs which easily could be aggregated into a single /15 with the loss of some routing specificity (which is lost anyway when that provider's internal metrics don't propagate to its external peers).
The remainder of the 'chunks' of old style Bs are all longer than 18 bits, and most are /24s or /26s, and I see none at all that appear difficult to aggregate, or which look like anything other than leaks due to misconfiguration.
If you get to the point where someone needs to have a /18 in the old-style class B space and it can't be aggregated, we can return to this.
Sean.
Hallo, the Municipality of Zuerich has got assigned 1/2 class B in April this year after a long discussion with RIPE NCC. They will soon get onto Internet. I need to be sure that this address space is routed on the Internet. Sean, Geert-Jan, could you comment, please. Regards, Willi Huber inetnum: 131.117.0.0 - 131.117.127.255 netname: ZUERI-NET descr: Municipality of Zuerich descr: Zuerich. Switzerland country: CH admin-c: BM16-RIPE tech-c: BM16-RIPE changed: huber@switch.ch 950412 source: RIPE person: Beat Morf address: Organisation & Informatik der Stadt Zuerich address: Wilhelmstrasse 10 address: CH-8022 Zuerich phone: +41 1 279 92 62 phone: +41 1 279 91 11 fax-no: +41 1 279 93 85 e-mail: beat.morf@oiz.stzh.inet.ch nic-hdl: BM16-RIPE changed: huber@switch.ch 950601 source: RIPE
Willi Huber <huber@chx400.switch.ch> writes:
the Municipality of Zuerich has got assigned 1/2 class B in April this year
after a long discussion with RIPE NCC. They will soon get onto Internet. I need to be sure that this address space is routed on the Internet.
Sean, Geert-Jan, could you comment, please.
Willi, as far as the RIPE NCC is concerned we see this as follows: 1) All major transit providers are capable and willing to route fully classless, so we can assign address space in a classless manner. 2) Some service providers apply route filtering based on prefix length or other general criteria. This is a matter of the service providers concerned and we have no control over it. The proper way to resolve problems caused by this is to talk to the service provider concerned. Of course we will be happy to help if we can. 3) We inform service providers about the RIPE NCC assignment policies in the appropriate fora such as RIPE WGs, NANOG and IETF CIDRD WG. This enables service providers to take assignment policies into account when defining their routing policies. 4) We examine routing policies of service providers which are brought to our attention and provide feedback to the providers if we detect potential problems due to our assignment policies. 5) Service providers are invited to contribute to the definition of RIPE NCC assignemnt policies via the RIPE Local IR WG. In the particular case at hand we have informed Sprint (and everyone else) about the fact that we assign prefixes longer than /16 in the B space and Sprint have informed us that they currently see no problem routing these unless they can be aggregated to /16s or shorter. So your customer should not have a problem with Sprint. If you have any further questions, please do not hesitate to contact us. Regards Daniel Karrenberg RIPE NCC Manager PS: Sorry about the delay caused by illness.
participants (3)
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Daniel Karrenberg -
Sean Doran -
Willi Huber