North American Network Operators Group|
Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical
Re: IP over SONET considered harmful?
At 2:57 PM -0800 3/20/98, Kent W. England wrote: >As I recall, the world didn't end when the NSFNET NSSs were installed and >they decremented TTL twice. Weren't they changed to decrement once, >appearing as one instead of two routers? You got this part right. I thought we had heard the last of the TTL whining then. Apparently we haven't made much progress in the last eight years. >(For those who don't remember the NSFNET "routers" they consisted of an IBM >RS6000 attached to each of several T1/T3 interfaces, interconnected across a >FDDI with a route server. Nine RS6000s in all. 200 amp service required. :-) But this part is wrong. The description above is kind of a combination of the T1 NSS (rack of RTs, each RT services at most a single T1 or Ethernet, they talk to a route processor) and the T3 NSS (RS/6000 with autonomous port cards, pretty similar to any modern router). There's a half-decent description of the NSS architecture at http://www.merit.edu/nsfnet/ Historically yours, --John -- John Scudder email: [email protected] Internet Engineering Group, LLC phone: (734) 213-4939 x14 122 S. Main, Suite 280 fax: (734) 669-8661 Ann Arbor, MI 48104 www: http://www.ieng.com