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RE: BOOM! there goes WorldCom
by Peter Leppik 17 Jul '97

17 Jul '97

I was relying on an article which crossed my desk a few weeks ago, and now I can't find it again. My apologies if my memory failed me; it wouldn't be the first time. >-----Original Message----- >From: johnl(a)iecc.com [SMTP:johnl@iecc.com] >Sent: Wednesday, July 16, 1997 8:43 PM >To: Peter Leppik >Subject: Re: BOOM! there goes WorldCom > >>carriers. Qwest also bought a boatload of fiber from Williams Pipeline >>Co. some time ago, and signed a contract with Williams which locked >>Williams out of the business of deploying new fiber until early 1998 >>(Williams runs fiber through unused oil and gas pipelines, having >>discovered that fiber optics is more of a growth industry than >>schlepping around fermented dinosaurs). > >That is most bizarre. Williams has been in the fiber business for >ages, their fiber subsidiary was Wiltel which was the 4th or 5th >largest IXC by volume (mostly resold to other carriers) when it was >sold and merged into LDDS/Worldcom in early 1995. Are you saying that >after they spun off Wiltel, Williams went back into the fiber >stringing business? > >-- >John R. Levine, IECC, POB 640 Trumansburg NY 14886 +1 607 387 6869 >johnl(a)iecc.com, Village Trustee and Sewer Commissioner, >http://iecc.com/johnl, >Finger for PGP key, f'print = 3A 5B D0 3F D9 A0 6A A4 2D AC 1E 9E A6 36 A3 >47

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RE: BOOM! there goes WorldCom
by Todd Wilkens 17 Jul '97

17 Jul '97

When Worldcom does change the DLR, you get an automated fax notification that states they are performing "maintenance" or a "groom" on your ckt. This means there is a high probablity they are changing the design of your ckt and your diversity may not exist after the groom. You should probably respond to the fax and find out exactly what they are doing. You can also have your sales rep mark you order in the Wcom database as "diversely routed". You also need to specify the ckt you want to be diversely routed from. This should stop you ckt from being added to any groom packages that are being put together. If your ckt is not marked diverse, grooms can occur frequently. >---------- >From: randy@psg.com[SMTP:randy@psg.com] >Sent: Wednesday, July 16, 1997 5:13 PM >To: Nathan Stratton >Cc: nanog(a)merit.edu >Subject: Re: BOOM! there goes WorldCom > >> Worldcom changed the DLRs without letting us know > >happens all the time. they do that like we move customers between router >ports. > >if you want to maintain path diversity, you have to continually monitor it >with your carriers. and then you'll need to go out and physically every >once in a while. yes, this is major major pain. > >randy >

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by Todd Wilkens 17 Jul '97

17 Jul '97

When Worldcom does change the DLR, you get an automated fax notification that states they are performing "maintenance" or a "groom" on your ckt. This means there is a high probablity they are changing the design of your ckt and your diversity may not exist after the groom. You should probably respond to the fax and find out exactly what they are doing. You can also have your sales rep mark you order in the Wcom database as "diversely routed". You also need to specify the ckt you want to be diversely routed from. This should stop you ckt from being added to any groom packages that are being put together. If your ckt is not marked diverse, grooms can occur frequently. >---------- >From: randy@psg.com[SMTP:randy@psg.com] >Sent: Wednesday, July 16, 1997 5:13 PM >To: Nathan Stratton >Cc: nanog(a)merit.edu >Subject: Re: BOOM! there goes WorldCom > >> Worldcom changed the DLRs without letting us know > >happens all the time. they do that like we move customers between router >ports. > >if you want to maintain path diversity, you have to continually monitor it >with your carriers. and then you'll need to go out and physically every >once in a while. yes, this is major major pain. > >randy >

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RE: BOOM! there goes WorldCom
by Todd Wilkens 17 Jul '97

17 Jul '97

I believe Worldcom owns the majority of their fiber and I think all three lease fiber from Qwest. Qwest has fiber in the ground nation wide. I just don't know how much is lit. >---------- >From: Charles Sprickman[SMTP:spork@inch.com] >Sent: Wednesday, July 16, 1997 7:18 PM >To: Scott Landman >Cc: nathan(a)netrail.net; bnite(a)tremere.ios.com; mpearson(a)games-online.com; >nanog(a)merit.edu >Subject: Re: BOOM! there goes WorldCom > >On Wed, 16 Jul 1997, Scott Landman wrote: > >> If fibers being cut is the culprit here, does going with a supplier like >> Qwest make sense because their fibers are running down railroad right of > >I was under the impression that there was one fiber giant that actually >owns its own fiber, and that its name is AT&T... Who is Qwest??? > >Anyone have any stats on how much MCI, Sprint, WCom actually own? > >Charles > >~~~~~~~~~ ~~~~~~~~~~~ >Charles Sprickman Internet Channel >INCH System Administration Team (212)243-5200 >spork(a)inch.com access(a)inch.com > > > > >

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RE: BOOM! there goes WorldCom
by Todd Wilkens 17 Jul '97

17 Jul '97

There are many common fiber routes that all the carriers are in. Worldcom has much of it's fiber along or in pipelines. >---------- >From: Nikos Mouat[SMTP:nikm@ixa.net] >Sent: Wednesday, July 16, 1997 7:18 PM >To: Scott Landman >Cc: nanog(a)merit.edu >Subject: Re: BOOM! there goes WorldCom > > >If you're suggesting that Qwest is the only carrier using railroad right >of ways I suggest you take a closer look at those little orange posts >running along the side of train tracks.. I've seen MCI, Worldcom, AT&T, >sprint and others running along the same tracks from Seattle to >Portland. > >nm > >On Wed, 16 Jul 1997, Scott Landman wrote: > >> If fibers being cut is the culprit here, does going with a supplier like >> Qwest make sense because their fibers are running down railroad right of >> ways and, therefore, should be less succeptible to a backhoe digging >where >> it shouldn't be? Or are you looking at other, more secure mediums for >the >> bulk of your traffic? > >

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RE: BOOM! there goes WorldCom
by Todd Wilkens 17 Jul '97

17 Jul '97

I believe Worldcom owns the majority of their fiber and I think all three lease fiber from Qwest. Qwest has fiber in the ground nation wide. I just don't know how much is lit. >---------- >From: Charles Sprickman[SMTP:spork@inch.com] >Sent: Wednesday, July 16, 1997 7:18 PM >To: Scott Landman >Cc: nathan(a)netrail.net; bnite(a)tremere.ios.com; mpearson(a)games-online.com; >nanog(a)merit.edu >Subject: Re: BOOM! there goes WorldCom > >On Wed, 16 Jul 1997, Scott Landman wrote: > >> If fibers being cut is the culprit here, does going with a supplier like >> Qwest make sense because their fibers are running down railroad right of > >I was under the impression that there was one fiber giant that actually >owns its own fiber, and that its name is AT&T... Who is Qwest??? > >Anyone have any stats on how much MCI, Sprint, WCom actually own? > >Charles > >~~~~~~~~~ ~~~~~~~~~~~ >Charles Sprickman Internet Channel >INCH System Administration Team (212)243-5200 >spork(a)inch.com access(a)inch.com > > > > >

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RE: BOOM! there goes WorldCom
by Todd Wilkens 17 Jul '97

17 Jul '97

When Worldcom does change the DLR, you get an automated fax notification that states they are performing "maintenance" or a "groom" on your ckt. This means there is a high probablity they are changing the design of your ckt and your diversity may not exist after the groom. You should probably respond to the fax and find out exactly what they are doing. You can also have your sales rep mark you order in the Wcom database as "diversely routed". You also need to specify the ckt you want to be diversely routed from. This should stop you ckt from being added to any groom packages that are being put together. If your ckt is not marked diverse, grooms can occur frequently. >---------- >From: randy@psg.com[SMTP:randy@psg.com] >Sent: Wednesday, July 16, 1997 5:13 PM >To: Nathan Stratton >Cc: nanog(a)merit.edu >Subject: Re: BOOM! there goes WorldCom > >> Worldcom changed the DLRs without letting us know > >happens all the time. they do that like we move customers between router >ports. > >if you want to maintain path diversity, you have to continually monitor it >with your carriers. and then you'll need to go out and physically every >once in a while. yes, this is major major pain. > >randy >

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Re: BOOM! there goes WorldCom
by Sean M. Doran 17 Jul '97

17 Jul '97

| Sprint uses 4 ring sonet loops. Two backup and two active. This way | there is total capacity availiable in the event of a fiber cut. The data | just takes the reverse way around the loop on the backup path. I believe | they should have all the loops completed by the end of the year. Most fibre point-to-point links use two fiber strands, and typically one is set up as a transmitter and the other as a receiver. That is, two unidirectional fibre strands form a pair. (With WDM, one ends up with multiple wavelengths on the same fibre -- which is roughly akin to cleaving the fibre into two fibres -- and one can either have multiple transmitters or mixed transmitters and receivers on any single strand. A single strand, therefore, can look like a fibre pair, if you wanted, or a pair of strands could carry multiple "virtual fibre strands" each containing light at different frequencies) A fully protected SDH or SONET ring is made up of two or more pairs of fibre along different physical paths. Each SDH or SONET multiplexer has sufficient buffering to make up for any propagation delay difference (sometimes many milliseconds thanks to the slowness of light in glass, and also thanks to repeater jitter). A copy of the data recently arrived on the shorter physical path is retained in memory and compared against the copy which arrives later along the longer path. Any discrepancies are flagged as errors, and set off alarm bells. Missing data is considered a line failure, and if data is missing off the primary path, the data arriving from the secondary path is forwarded instead. SDH and SONET therefore are theoretically immune to any single equipment failure outside of the MUXes themselves. The time to recover from any fibre cut or optics failure is roughly the difference in the observed propagation delay plus a fudge factor which takes thermal and other effects into account. With the ongoing deployment of WDM in carriers' networks, there will be moves either to parallelize SONET and SDH using the traditional four strands, to do clever aggregation (present a concatenated unidirectional fibre to a MUX at the cost of some further propagation delay and antijitter techniques), or to deploy 2-stranded SDH/SONET rings. There will also be pushes to use multiplexing technologies other than SDH or SONET. Which is the best approach depends significantly on point-of-view. Personally I like the idea of ever-faster bit- (or byte-) pipes in an effort to keep the number of interfaces in switching equipment down. Others strongly disagree and would make the opposite trade-off. YMMV. Sean.

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root nameservers broken again?
by Taner Halicioglu 17 Jul '97

17 Jul '97

bleh... is it me, or are the root nameservers hosed again? e.g.... ;; QUESTIONS: ;; 1.1.251.206.in-addr.arpa, type = ANY, class = IN ;; AUTHORITY RECORDS: IN-ADDR.ARPA. 86400 SOA A.ROOT-SERVERS.NET. hostmaster.INTERNIC.NET. ( 1997071600 ; serial 10800 ; refresh (3 hours) 900 ; retry (15 mins) 604800 ; expire (7 days) 86400 ) ; minimum (1 day) ;; Total query time: 90 msec ;; FROM: coredump to SERVER: a.root-servers.net 198.41.0.4 looks like this for [a-d].root.servers.net... e,f,g look ok (as far as I can tell)... -Taner -- D. Taner Halicioglu taner(a)isi.net Programmer/Engineer/Sysadmin ISI / GlobalCenter Voice: +1 408 543 0313 Fax: +1 408 541 9878 PGP Fingerprint: 65 0D 03 A8 26 21 6D B8 23 3A D6 67 23 6E C0 36

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BOOM! there goes WorldCom
by Matthew Pearson 17 Jul '97

17 Jul '97

At 11:59am today WorldCom lost 6 major ATM trunks from St. Louis to L.A. So as you can imagine... MANY MANY ISPs are in some state of down. Just letting you know. No time estimate to repair has been made.

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