If you've seen the news, you've seen the Cash America Inc building in Fort Worth. Its the one with no windows. Although the building suffered extensive damage, and Cash America may have to abandon it, their computer center providing service to 400+ pawn shops around the country worked without interruption. Even though I don't work with libraries anymore, they still draw my attention. The Fort Worth Public Library, which is mostly underground, had significant damage to its aboveground expansion. For those who say, I told you underground is better, I'd remind you about the extensive damage to Boston Public Library's lower levels when a water main broke. Pick your risk. Sprint showed that fiber rings can work, if you do them right. Sprint suffered a fiber cut in downtown Fort Worth during the tornado. I don't think anyone outside of Sprint's operation center noticed. I didn't. Southwestern Bell now says one of their facilities in Arlington had a power failure, and is now backup on generator power.
On Thu, Mar 30, 2000 at 08:12:49PM -0800, Sean Donelan wrote:
If you've seen the news, you've seen the Cash America Inc building in Fort Worth. Its the one with no windows. Although the building suffered extensive damage, and Cash America may have to abandon it, their computer center providing service to 400+ pawn shops around the country worked without interruption.
I'd bet they don't have a datacenter with a view.
Even though I don't work with libraries anymore, they still draw my attention. The Fort Worth Public Library, which is mostly underground, had significant damage to its aboveground expansion. For those who say, I told you underground is better, I'd remind you about the extensive damage to Boston Public Library's lower levels when a water main broke. Pick your risk.
I'll risk water main breaks. they rarely kill 4 and wound 90.
Sprint showed that fiber rings can work, if you do them right. Sprint suffered a fiber cut in downtown Fort Worth during the tornado. I don't think anyone outside of Sprint's operation center noticed. I didn't.
tornadoes are a good diversionary tactic. their PR dept must have conspired. <joke> q: how is a marketing meeting like a tornado? a: both are a lot of hot air going around in circles at high speed </joke>
Southwestern Bell now says one of their facilities in Arlington had a power failure, and is now backup on generator power.
had to have been Matlock Rd. right in the path of the tornado. my aunt is (I believe) served out of there, and was up and running quite shortly after the storm. I was able to leave a message on her voicemail even as the tornado was working its way through Grand Prairie. -- Sam Thomas Geek Mercenary
Unnamed Administration sources reported that Sean Donelan said:
Even though I don't work with libraries anymore, they still draw my attention. The Fort Worth Public Library, which is mostly underground, had significant damage to its aboveground expansion. For those who say, I told you underground is better, I'd remind you about the extensive damage to Boston Public Library's lower levels when a water main broke. Pick your risk.
During the Cold War, both Uncle Sam and ATT built a large number of VERY sturdy bunkers. These typically had 18" thick concrete walls, Diesels with 2 weeks of fuel, double blast doors thick enough to defeat an $cientology lawyer seeking Xenu, and filters almost good enough to take the stink out of the air during a Senate campaign. Many are near empty; others used in mudane tasks such as storage. While they were NOT located in city centers for obvious reasons, in some cases the city has come to them over the years. Folks wishing to avoid glass towers might start looking at <http://www1.shore.net/~mfoster/L4> for alternatives. -- A host is a host from coast to coast.................wb8foz@nrk.com & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433
Dear all, For the big ISP networks (tier 1 or 2) that happens to use OSPF, what is the typical number of OSPF areas in the network? According to OSPF books, a typical area is consisted of 200 routers. Are those guidelines ever followed in real ISP network deployment? Any input is highly appreciated. Cheers, Hansen
Disclaimer: This is a religious issue. This is also an issue that is non-operational and should be on PUCK... 200 routers seems excessive. 50 routers is much more reasonable. The important part is to limit external routes being redistributed into OSPF. External routes are bad mojo. Daniel Golding Senior Network Engineer NetRail, Inc. ----------------------- dan@netrail.net (404) 739-4346 On Fri, 31 Mar 2000, HANSEN CHAN wrote:
Dear all,
For the big ISP networks (tier 1 or 2) that happens to use OSPF, what is the typical number of OSPF areas in the network? According to OSPF books, a typical area is consisted of 200 routers. Are those guidelines ever followed in real ISP network deployment?
Any input is highly appreciated.
Cheers, Hansen
Thank you for the information. What I'm also interested is what is the typical number of OSPF area in today's large ISP backbone (if they are using OSPF, not IS-IS). Anyone has some input? Thanks, Hansen "Daniel L. Golding" wrote:
Disclaimer: This is a religious issue. This is also an issue that is non-operational and should be on PUCK...
200 routers seems excessive. 50 routers is much more reasonable. The important part is to limit external routes being redistributed into OSPF. External routes are bad mojo.
Daniel Golding Senior Network Engineer NetRail, Inc. ----------------------- dan@netrail.net (404) 739-4346
On Fri, 31 Mar 2000, HANSEN CHAN wrote:
Dear all,
For the big ISP networks (tier 1 or 2) that happens to use OSPF, what is the typical number of OSPF areas in the network? According to OSPF books, a typical area is consisted of 200 routers. Are those guidelines ever followed in real ISP network deployment?
Any input is highly appreciated.
Cheers, Hansen
On Fri, 31 Mar 2000, HANSEN CHAN wrote:
Dear all,
For the big ISP networks (tier 1 or 2) that happens to use OSPF, what is the typical number of OSPF areas in the network? According to OSPF books, a typical area is consisted of 200 routers. Are those guidelines ever followed in real ISP network deployment?
Any input is highly appreciated.
In an ISP context, given that IS-IS and OSPF are roughly equivalent in terms of resource consumption on a theoretical level (individual implementations may vary depending on the various data structures, algorithms used etc. for costing models), I see no problem with running 300-400 routers in a area. Of course this depends on how stable you expect the underlying transport fabric to be and what you use OSPF for (e.g. ibgp-hack) and how smart you are when you go about it (i.e. a well designed IGP structure may have 500-700 routers in one area and not have significant issues). For an enterprise type network with OSPF as the sole protocol and depending on the number of adjacencies, your mileage may vary considerably. /vijay
participants (6)
-
Daniel L. Golding -
David Lesher -
HANSEN CHAN -
Sam Thomas -
Sean Donelan -
Vijay Gill