my .02 worth. see in-line comments
> -----Original Message-----
> From: Beckster [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, June 01, 2000 10:16 AM
> To: Joe Szczepanski
> Cc: Howard C. Berkowitz; [EMAIL PROTECTED]
> Subject: Re: How to make redundancy using BGP?
>
>
> I am running up against the same problem. Contacting both ISP's
> (Sprint and
> Allegiance)
> and they assure me that they can handle it on their end and all I
> need to do is
> get an AS
> number and a list of addresses that we want to send out.
>
> However, my concern is this - we are a 24/7 shop - how do I:
> a) switch out our existing old yucky bay router to the
> brand-stinkin' new Cisco
> 3640
> while at the same time:
No down time at all??? We're a 24x7 shop, but we do have the right to take
4am - 8am on monday mornings for maintenance. There are ways to do this
live, but it depends on the setup of your network. I would get both routers
working and running BGP if possible (on the old bay router, you dont need to
accept routes, only advertise them), use a different internal ip address for
the new router. When you are ready to make the switch, you can change the
route to the router in the devices which route through it, or take a 5
minute downtime and power down the old router and change the ip address on
the new router. After that is done, you should be able to move the T. Like
I said, how you do this depends on what your network currently looks like.
If you have 300 PC's which are pointing to the internal interface of the
router, you dont what to have to change the gw settings on all of those
PC's. But if you have the router connected to the internet and a firewall
between your network and the inet, you maybe able to change the route (next
hop pointed to the new router)on the firewall without loosing any traffic.
Dont forget to turn off the old router ASAP, as it is still be advertising
your routes to the rest of the world.
How about a suggestion?? If the budget permits, get another router and
build the redundancy into your internet connection. This will allow you to
take a router off-line with out bringing down the network.
Check out these links:
http://cio.cisco.com/warp/public/459/18.html
or
http://joe.lindsay.net/bgp.html
> b) adding the new T1 (Allegiance) line to the mix
> AND
> c) make sure that the routing will work over both lines?
>
Your isp should be able to help you verify that your routes are being
properly sent to them. Also, you should be able to use a looking glass
(http://nitrous.digex.net/) to do a traceroute or bgp inq. and see if you
routes are populating correctly.
> It seems that as my company triples in size, we are stuck with
> old, half-done
> solutions
> because we can not afford the downtime to correct while we implement new.
> Basically, we seem to end up adding more and more layers over (excuse me)
> crappy
> original networking solutions! I'm just getting started on my
> CCNA and already
> I think
> I need a new career.... ;-)
Dont give up yet. It sounds like you are just getting to the fun stuff.
>
> I think this has all been rhetorical, but I wonder how many other
> shops are
> getting
> themselves into the same quagmire? We can't be the only company
> who refuses to
>
> pay top money to attract top talent/skillsets and therefore ends
> up with this
> kind of
> mess. Ok, I better stop before this turns into a rant - we need
> to create a
> "I'[EMAIL PROTECTED]".... *grin*
Someone will actually pay us more then minimum wage???????
>
> Thanks all,
> Becky Pinkard
>
>
>
> Joe Szczepanski wrote:
>
> > > -----Original Message-----
> > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> > > Howard C. Berkowitz
> > > Sent: Wednesday, May 31, 2000 9:59 PM
> > > To: [EMAIL PROTECTED]
> > > Subject: Re: How to make redundancy using BGP?
> > >
> > >
> > > The quick answer to both questions is "it depends."
> > >
> > > What it will most depend on is how willing your ISPs are to
> work with you
> > > in implementing multihoming, and their clue level about
> > > multihoming. I talk
> >
> > Dont overlook Howards comment about the clue level of your ISP.
> If you are
> > using some of the smaller tier providers, they very well could
> be clueless
> > when it comes to multihoming. We multihommed about 2 years
> ago, and even
> > the big time players (UUNET, ATT, etc) were clueless at that
> time (unless
> > you were able to get some of their most senior techs on the
> phone). Since
> > then things have gotten better, but I still run into the
> occasional smaller
> > ISP that has no idea about multihoming.
> >
> > Joe
> >
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