Re: AutoInstall notes...

Ever see what happens if a router has a blank config when it boots...

Watch for a minute and Autoinstall will become very clear.

On Sat, Apr 25, 2009 at 3:16 PM, Pavel Bykov <slidersv_at_gmail.com> wrote:

> Autinstall, if I remember coorectly, works when you have blank config (i.e.
> after connecting you would see "would you like to enter automatic config:
> yes/no)
> In such a case, router has some interfaces unshut out of the box (you have
> to look at doccd which model has which ports unshut)
> and runs DHCP client on them.
>
> Over frame relay is a problem I think, since there is no "encapsulation
> frame-relay" by default on such interfaces.
>
>
> Also, ip-helper address command is used to translate broadcast frames of
> certain protocols/ports into unicast ones. This is needed when R5 sends
> DHCP
> Reques to the hub. Once it has ip adderss, it does not require helper
> address translation. Or what is the logic here? That broadcast frame will
> get to DHCP, TFTP and DNS server at the same time?
>
>
> Otherwise, if you want your AI to work in the example you have two commands
> missing:
> 1. ip address dhcp
> 2. service config
>
> Without these commands, AI will not get an address and will not download
> the
> config.
>
>
> On Mon, Apr 20, 2009 at 9:13 PM, Modular <modulartx_at_gmail.com> wrote:
>
> > I've been trying to nail down autoinstall just in case I get the dreaded
> > autoinstall over frame-relay scenario
> > on my Lab. Using info I found on the net I put some notes together on it.
> > Would some of you mind looking
> > through my notes and telling me if I'm missing anything or if anything is
> > wrong?
> >
> > Thanks,
> > Bryan R.
> >
> >
> >
> ----------------------------------------------------------------------------------------------------------------------
> > Auto-Install:
> > Happens in steps:
> > 1. DHCP to get IP. (optional)
> > 2. Name-server lookup to get host name.
> > 3. TFTP server to get config file.
> >
> > There are 4 "Functions" involved with this:
> > 1. DHCP -Gives AI Router an IP.
> > 2. DNS Server -Gives AI Router it's Name.
> > 3. TFTP Server -Gives AI Router it's config file.
> > 4. Hub -Optional. If exists need helper maps pointing to tftp & DNS
> > servers
> > AND
> > "ip name-server" and domain-lookup configured. Possibly DHCP
> > configured.
> >
> > CONFIGURATION:
> > R5 is AI Router. R1 is the TFTP server, R6 is the DNS server and R4 is a
> FR
> > hub.
> >
> > R1: -TFTP Server
> >
> > "tftp-server flash:r5-confg"
> > -Note that the file must be in the flash of the device.
> >
> >
> > R6: -DNS Server
> >
> > ip host r5 155.1.0.5
> > ip dns server
> > ip domain-lookup
> >
> >
> > R4: -FR Hub & DHCP Server.
> >
> > ip domain-lookup
> > ip name-server 155.1.146.6
> > interface Serial0/0
> > ip address 155.1.0.4 255.255.255.0
> > ip helper-address 155.1.146.1 <-IP's of tftp and dns servers.
> > ip helper-address 155.1.146.6
> > encapsulation frame-relay
> > frame-relay map ip 155.1.0.5 405 broadcast
> > no frame-relay inverse-arp <-No inverse-arp, so need frame
> > map on
> > AI Router.
> >
> > ip dhcp exclude-address 155.1.0.1 155.1.0.4
> > ip dhcp exclude-address 155.1.0.6 155.1.0.255
> > ip dhcp pool
> > network 155.1.0.0 /24
> >
> >
> > R5: -AutoInstall router
> >
> > interface serial0/0
> > encapsulation frame-relay
> > no frame-relay inverse-arp
> > frame-relay map ip 155.1.0.4 504 broadcast
> >
> >
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> >
> >
> >
> >
> >
> >
>
>
> --
> Pavel Bykov
> ----------------
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Received on Sat Apr 25 2009 - 15:56:12 ART