From: Rastas . (rastas_1@xxxxxxxxxxx)
Date: Fri May 24 2002 - 12:16:10 GMT-3
Hi,
How about if you set the number of pings sent out before addresses are
assigned on the secondary server to a value higher than that of the primary,
so the primary will always respond quicker with the new address to the
device. That way, if the primary goes down, the secondary will take over
handing out leases in the same scope.
Just an idea - although I've never tried it I remember reading about it
somewhere before.
----Original Message Follows----
From: David Luu <wicked01@ix.netcom.com>
Reply-To: David Luu <wicked01@ix.netcom.com>
To: p729@cox.net, "CCIE-Maillist" <CCIE-Maillist@foxgal.com>,
<ccielab@groupstudy.com>
Subject: Re: Cisco IOS DHCP primary/secondary server on same VLAN
Date: Thu, 23 May 2002 20:44:40 -0700
i believe DHCP redundancy can be accomplished through HSRP, there is
another way, but it escapes me at the moment, when i remember it, i will
post it up
At 10:40 PM 5/23/2002 -0400, p729@cox.net wrote:
>I don't believe so. Since the DHCP request is a broadcast, the CNR main
>and backup DHCP servers have to track each other's state so that each one
>knows who's supposed to fulfill the request for a given scope. As far as I
>know, there is no provision for this with the IOS DHCP server and you can
>only get a small measure of redundancy by splitting the scopes across two
>servers without overlap.
>
>Regards,
>
>Mas Kato
>https://ecardfile.com/id/mkato
>
>============================================================
>From: "CCIE-Maillist" <CCIE-Maillist@foxgal.com>
>Date: 2002/05/23 Thu AM 07:02:27 EDT
>To: <ccielab@groupstudy.com>
>Subject: Cisco IOS DHCP primary/secondary server on same VLAN
>
>With the Cisco IOS DHCP server feature, is there some way to have one
>server
>as the primary server and another as the backup, on the same vlan, with an
>automatic "failover", such that clients go to one Cisco router DHCP server
>and
>if that one goes down, the second one answers?
>
>(this is WITHOUT using a product like Cisco Network Registrar)
>
>I know that I could configure two Cisco IOS DHCP servers on the same vlan
>with
>different scopes and that would make two servers available. The first one
>to
>answer the broadcast for DHCP services would provide the service to the
>client. BUT, how would I have one server be preferred over the other in
>that
>situation, or another one that someone can come up with?
>
>*** Does this command do that or is this just for TFTP download?
>
>next-server
>To configure the next server in a Dynamic Host
>Configuration Protocol
>(DHCP)
>client's boot process, use the next-server DHCP pool
>configuration
>command.
>Use the no form of this command to remove the boot
>server list.
>
>next-server address [address2...address8]
>
>no next-server address
>
>
>Syntax Description
>address
>Specifies the IP address of the next server in the
>boot process, which
>is
>typically a Trivial File Transfer Protocol (TFTP)
>server. One IP
>address is
>required, although you can specify up to eight
>addresses in one command
>line.
>
>
>
>
>Defaults
>If the next-server command is not used to configure a
>boot server list,
>the
>DHCP server uses inbound interface helper addresses as
>boot servers.
>
>Command Modes
>DHCP pool configuration
>
>Usage Guidelines
>This command first appeared in Cisco IOS Release
>12.0(1)T.
>
>You can specify up to eight servers in the list.
>Servers are listed in
>order
>of preference (address1 is the most preferred server,
>address2 is the
>next
>most preferred server, and so on).
>
>Examples
>The following example specifies 10.12.1.99 as the IP
>address of the
>next
>server in the boot process:
>
>next-server 10.12.1.99
>
>Related Commands
>bootfile
>ip dhcp pool
>ip helper-address
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:59:07 GMT-3