In the referenced message, Adrian Chadd said:

Hi all,

Just (mostly) out of personal curiousity - is anyone here running any PtP links using 31 bit prefixes rather than the /30's we're all happy with?

If you go "huh?" take a look at rfc3021 - "Using 31-Bit Prefixes on IPv4 Point-to-Point Links"

Thanks, Adrian

Yes, and it works wonderfully. The only issue is (for me) getting around the thought that even=low and odd=high, vs the case where odd=low and even=high. For example, when I'm on a router, look at an interface, and want to ping the other end, I have to get out of years of autopilot.

On Sat, Apr 06, 2002, Adrian Chadd wrote:

Hi all,

Just (mostly) out of personal curiousity - is anyone here running any PtP links using 31 bit prefixes rather than the /30's we're all happy with?

If you go "huh?" take a look at rfc3021 - "Using 31-Bit Prefixes on IPv4 Point-to-Point Links"

Summarising the few private replies I've had: * a few people did reply saying that they're using it successfully * someone reported that it worked successfully on 12000 and some 7500 series routers, running a 12.0S train IOS * someone else reported that any IOS train that has been eligible to receive "new features" in the last 9 months will have /31 bit PtP support * I can add that vendor N's broadband concentrator doesn't allow you to add a /31 (they actually let you assign up to /30, then /32 to an interface :) I hope this is of some interest to the list members. If anyone is running /31's on PtP links on vendor J's equipment, I'd like to hear from you. Adrian -- Adrian Chadd "For a sucessful technology, reality must <adrian@creative.net.au> take precedence over public relations, for nature cannot be fooled" - Feynmann