Good point that I hadn't considered.
Could look at microwave connections to a local CO or ISP as well. Heh,
that won't be terribly cheap either.
> One other thing to consider is that leasing two lines for each site
> doesn't necessarily give you fault tolerance. Although you have
> designed the primary/backup scheme with separate providers, have you
> considered that the leased line runs (99% of the time) to the same
> exact CO, and that the odds are heavily that the two lines also run in
> the same conduit. If this is the case, you have no "backhoe"
> redundancy and no CO redundancy. These are things to consider when
> you are mistakenly believe you are paying for true redundancy through
> multiple lines. The only thing you gain by this is protection from
> ISP failure which might not be worth the cost of the extra line.
> Basically, I noticed that you desire fault tolerance by purchasing
> multiple leased lines per site. Neither telco nor your ISPs will
> bother to mention this because it means more money for them. This is
> just something else to think about. Also if you follow the suggestion
> about leased lines between your three sites, you still will be going
> through the same CO (and probably the same conduit), so you won't get
> any additional redundancy with this method either.
> >VPNs are only connecting the three sites together. The VPN is only
> >known to the company's network itself, not the Internet as a whole.
> >far as the ISPs are concerned, they are still three separate
> >BGP requires a continuous network to function correctly. One ASN for
> >three separated sites wouldn't work. Your scenario requires three
> >The only way to make this work (that I can think of right now) is to
> >connect your three sites together with its own network. Instead of
> >having two ISPs at each site, use one ISP at each site and link the
> >networks together with leased lines. If your ISP goes down, the site
> >still has the leased line back through another site to the ISP. If
> >leased line goes down, your VPN still has a route back. Problems
> >arise, however, since your networks are now announcing their ASNs in
> >different places. Messy.
> >Of course, money plays a major part here since long haul circuits
> >> You may want to develop an alternative plan in case you can only
> >> ASN. With only about 30,000 unassigned ASN's left in the world, it
> >> hard to get three simply so you can save money with VPNs. But you
> >> know...
> >> Good luck and keep us informed!
> >> Vincent C Jones
> >> >We are in the process of requesting our ASN and will be getting
> >> >equipment in the near future. The plan is for each of three sites
> >> >have redundant links with a common ISP at each of those sites as
> >> >the links. The other link at each site would be a large regional
> >> >as a backup link. Each site is connected to the others through
> >> >through these same links, so if both links go down, its probably
> >> >beneficial to have site B think it can route to site A internally.
> >> >When requesting the ASNs, am I supposed to be requesting one for
> >> >site, or one for the corporation? I do not want traffic for site
> >> >routed to site B. I just want to make sure that if link 1 at site
> >> >goes down, traffic automatically flows through link 2. And so on
> >> >the other sites, but not necessarily that they communicate other
> >> >through the VPNs which would only be up anyway if the links were
> >> >healthy.
> >> >Am I right to assume that I cannot get any load balancing between
> >> >two ISPs so that we effectively bond the two links at each site?
> >> >--
> >> >http://www.shokk.com
> >> >ICQ-17933910 Ernie "Shokk" Oporto
> >> >Sent via Deja.com
> >> >http://www.deja.com/
> >> --
> >> Dr. Vincent C. Jones, PE Author of the Addison-Wesley
> >> Computer Network Consultant High Availability Networking
> >> Networking Unlimited, Inc. Cisco, follow the web link
> >> 14 Dogwood Lane, Tenafly, NJ 07670
> >> http://www.networkingunlimited.com
> >> -----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
> >> http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
> >> -----== Over 80,000 Newsgroups - 16 Different Servers! =-----
> >Sent via Deja.com