Have you looked into running HSRP on the distribution switches. To do so,
you will have to run layer 3 at the distribution layer as well. It works -
I have our network set up in the Core-distribution-access design with HSRP
running at the distribution area. Take a look at these links...
Go and buy that second sup!! If you read your post you answer your
own question!!
Dave
Thomas N. wrote:
Hi Group,
I have this scenario and wonder if it is possible to setup the topology
with
redundancy. I have a CAT 6509 acting as the core switch (say switch A),
and 2 other CAT 6506
Another option is to dual-home all of your access-layer switches to the dist
switches. You can create 2 trunks on each access switch, one to each dist
switch, and configure each of them via STP so that (for instance) your even
numbered vlans go to dist switch #1 and fail over to switch #2, and
My suggestion is to set up the access switches with 2 GBICs. One for Distro
switch B and one for Distro switch C. If one of the Distro switches fail,
you will automatically be routed to the other Distro switch. Again, make
sure you're trunking between the links so any VLANs will still work.
this and
even then, most users won't notice.
David C Prall [EMAIL PROTECTED] http://dcp.dcptech.com
- Original Message -
From: Andri Herkenrath
To:
Sent: Monday, June 25, 2001 9:31 AM
Subject: Re: Redundancy with 4908 [7:9757]
I think you misunderstood me .
I don4t want to use a spanning
Have you turned on spanning tree uplinkfast on the 3500's and uplinkfast and
backbonefast on the 4908's. I would also make one of the 4908's root for
half the vlans and secondary for the other half, with the opposite vlans on
the other.
David C Prall [EMAIL PROTECTED] http://dcp.dcptech.com
I think you misunderstood me .
I don´t want to use a spanning tree.
Isn´t there a more sophisticated way to build a redundancy ?
Thanks
A.Herkenrath
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7i=9772t=9757
--
FAQ, list
-- Forwarded by Jenny Mcleod/NSO/CSDA on 04/06/2001
10:50 am ---
Jon @groupstudy.com on 01/06/2001 07:38:01 am
Please respond to Jon
Sent by: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
cc:
Subject: RE: Redundancy design question [7:6646]
Keep in mind
Well, worse case scenario, use 56K modem as backup point being,
there are ways to provide backup WAN connectivity for not alot of money.
HSRP could be used (as mentioned before), or the modem/ISDN could be
designated as a backup interface. A bit easier to configure than HSRP.
Mike
-- Forwarded by Jenny Mcleod/NSO/CSDA on 04/06/2001
10:50 am ---
Jon @groupstudy.com on 01/06/2001 07:38:01 am
Please respond to Jon
Sent by: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
cc:
Subject: RE: Redundancy design question [7:6646]
Keep in mind
ISDN is not so cheap in cali unless you can get Centrex..
Brian Sonic Whalen
Success = Preparation + Opportunity
On Thu, 31 May 2001, Michael L. Williams wrote:
Well, having more than one router connected to the same WAN connection
still
leaves a single point of failure. Where I work, we
Jon,
the answer to your question is NO.
here`s the reasonyou COULD make yourself a Y cable from your CSU/DSU
,but you would have a few issues.
I tried this sometime ago and found out the hard way.
OK.first thing if both routers are on you have a major routing loop
problem..AKA split
: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Jon
Sent: Thursday, May 31, 2001 4:38 PM
To: [EMAIL PROTECTED]
Subject: RE: Redundancy design question [7:6646]
Keep in mind, this is not the typical help me design/fix my network for
free question. I have been reading various papers
However, if I only have one WAN circuit coming into the facility, it can
only be connected to one router at a time, right? So, if the active
router fails, how does the WAN connectivity fail over, short of an
operator moving the cable to the second router? I'm not trying to address
WAN circuit
Asked because I don't know: how do you plan on making the switches
redundant? How are your servers, for example homed on the switches? Is it
real redundancy if closet switches are dual homed to core switches? Is your
internet connection, your firewall, etc dual homed as well?
Chuck
The world is
Well, you have pinpointed the problem with many redundant campus network
designs. They may not be redundant into the WAN.
To meet your goals, you may need a backup WAN connection of some sort.
Depending on the level of performance you want for the backup and the
amount of traffic that you
An excellent book on this subject is High Availability Networking with Cisco
by Vincent Jones ISBN 0201704552.
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Priscilla Oppenheimer
Sent: Thursday, May 31, 2001 3:11 PM
To: [EMAIL PROTECTED]
Subject: Re
Keep in mind, this is not the typical help me design/fix my network for
free question. I have been reading various papers, chapters, and case
studies, and am trying to get my head wrapped around the details, now.
I've built some scenarios in my head, trying to see problems and
solutions, rather
Well, having more than one router connected to the same WAN connection still
leaves a single point of failure. Where I work, we have hundreds of remotes
sites, each of which has 2 routers connected together to the remote LAN
using HSRP. One router has a frame relay connection, and the other has
]]
Sent: Tuesday, January 30, 2001 9:45 PM
To: Jim Bond; [EMAIL PROTECTED]
Subject: Re: redundancy
Hi,
Where is your most likely point of failure or is bandwidth the issue. WIll
etherchannel work to the 2NICs. I don't know that the NT server will
understand Etherchannel.
In a study I did recently I
: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Tony van Ree
Sent: Tuesday, January 30, 2001 9:45 PM
To: Jim Bond; [EMAIL PROTECTED]
Subject: Re: redundancy
Hi,
Where is your most likely point of failure or is bandwidth the issue. WIll
etherchannel work to the 2NICs. I don't know
My two cents worth...
Set up a gigabit Etherchannel ISL trunk between the switches. For the NIC's
use two of the Intel Pro/100's; one homed to each switch. You then
configure the adapters as a "team" in both an adaptive load balancing and
fault tolerance mode. There is fairly decent
Hi,
Where is your most likely point of failure or is bandwidth the issue. WIll
etherchannel work to the 2NICs. I don't know that the NT server will understand
Etherchannel.
In a study I did recently I found in a network that all the user areas went to a "main
core switch". The servers had
Lots of questions to ask here, but primarily, the answer is to provide at
least 2 paths to each destination. Spanning tree is somewhat
intelligent in this situation, just set arp timeout according to your
preference. Are there servers, and if so, are you doing multiple nics in
each, or multiple
For the redundancy part you can define two static routes. Just make the
administrative distance on the "backup" higher than 1. Something like:
ip route 0.0.0.0 0.0.0.0 s0
ip route 0.0.0.0 0.0.0.0 s1 10
Don't know about the monitoring software? HP Openview? CiscoWorks?
/Jared
-Original
Hi,
You Can use "backup interface command" on primary interfacce so that when this
goes down ,secondary will automatically kick up.
The other command "Backup delay" will control the timing of link that how long
it will take to get up or down.
Interface Serial0
--
---
Backup
Are the 2 t1s going to the sam e isp, different isps, company offices or
what??
Bri
On Wed, 11 Oct 2000, Pete wrote:
This is what I have to work with. I have 2 T1, each going into s0 and s1.
What can I do to enable redundancy? If the T1 in s0 fails , s1 will
automatically
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