From: Pieter Jordaan (pieterj@is.co.za)
Date: Wed Oct 02 2002 - 04:00:47 GMT-3
Donny
I also don't think in the real world you would backup an Ethernet with ISDN
but remember every-one keeps on saying the lab is there to test your skills
overall and doesn't resemble real world.
Regards,
Pieter
-----Original Message-----
From: Donny MATEO [mailto:donny.mateo@sg.ca-indosuez.com]
Sent: 02 October 2002 08:56 AM
To: Pieter Jordaan
Cc: ccielab@groupstudy.com
Subject: RE: 3550 vs cat5k shutdown vs set port disable still no one has
come up with a solution
Pieter,
you're right for backup interface you can't test it on FE/E without actually
plug out the cable.
However,most scenario will backup a serial interface rather than an ethernet
interface. Why would
you want to backup an ethernet interface using an ISDN line ?
My approach is just to make sure that my isdn configuration is working
(meaning I can dial from both
side), and then just put the backup interface command under the serial
line/ethernet interface.
I'm not sure if there is a way to make a serial line goes to down/down,
perhaps frame-relay
keepalive end-to-end could do the trick ? i'll give it a try later.
Best Regards
Donny
Pieter Jordaan
<pieterj@is.co.za To: "'Donny MATEO'"
<donny.mateo@sg.ca-indosuez.com>, ccielab@groupstudy.com
> cc:
Subject: RE: 3550 vs cat5k
shutdown vs set port disable still no one has come
02-10-2002 14:45 up with a solution
Donny
The problem that I have seen (and recreated an different 2900/2950/3548 and
3550) switches is that when you shut the switch interface the router doesn't
go down/down. As far as the router is concerned the status is up/up. When
you do the same on a cat 4000/5500/6500 the router goes down/down, down/down
of course is a requirement for a backup interface to become active, if your
int is "admin down" the backup interface command doesn't work.
There are quite a few scenarios that I can think of where shutting the
switch port is required in order to test something and doing the shut on the
router doesn't work as it has to be shut remotely to achieve actual
down/down status, also in some cases you don't have access to the router,
but in the case of the 3500 and 2900 switches when you shut the interface it
stays powered and the router interface doesn't go down :(
Rebooting the switch to test your backup interface parameter in the lab wont
do either is it will only prove the the dialing works, while the switch is
rebooting you wont be able to test and see if your routing protocol
converges properly or if there is a routing loop as you wont have any
Ethernet connectivity between devices.
Maybe someone from cisco who is on this list can give us some feedback to
say whether thay have thought of this.
Thanks
-----Original Message-----
From: Donny MATEO [mailto:donny.mateo@sg.ca-indosuez.com]
Sent: 02 October 2002 08:27 AM
To: Pieter Jordaan
Cc: ccielab@groupstudy.com; nobody@groupstudy.com
Subject: Re: 3550 vs cat5k shutdown vs set port disable still no one has
come up with a solution
Hi,
I dont know what is the problem of this. But if you can't shut down the link
in the switch you can
always do it on the router. If you shut one end of the link woudn't that
automatically makes the
other link down, except for L1 connectivity.
As far as you argument goes, I can't find a good reason why you possibly
want to plug out a cable.
One thing for sure you can't do that during the test, you can't even touch
the rack. beside what
good will that do to you, all protocol are running on L2/L3. You just need
to restart L2/L3 stuff, I
don't suppose L1 will make a difference. If you really need to you can
always reboot the switch /
router.
Most problem I found can be solved with either shutdown the interface or
rebooting the devices. I've
never found a case where I need to physically plug out the cable from the
switch / router to solve a
problem. If there is L1 problem you can be sure pluging out the cable or
even changing the network
devices wouldn't do any good.
Donny
Pieter Jordaan
<pieterj@is.co.za To:
ccielab@groupstudy.com
> cc:
Sent by: Subject: 3550 vs cat5k
shutdown vs set port disable still no one has come up with a
nobody@groupstudy solution
.com
02-10-2002 13:42
Please respond to
Pieter Jordaan
Group
How do you test certain things if the switch port is still powered when it
is shut down, IE: the attached router interface stays up even when you shut
the 3550 switch port.
Set port disable, disables the port. Shut just prevents the port from
passing traffic but the port is still powered.
Guys I think this is a serous problem. If you have to use the backup
interface command on an ether interface but you can't make that interface go
down/down how do you test it?
Also when I debug for an IPX network number on the network I do a debug IPX
packet. I found the debug often doesn't show anything unless you drop the
link to the remote router and then bring it back up. But if shutting the
port doesn't take down the interface on the remote router, the router
doesn't re-broadcast onto the Ethernet segment and you don't get anything
from it.
I am sure many people will think of many reasons why they need to shut down
a port on a device.
Now in either of these scenarios if there may be sections dependant on the
outcome of these tests, which means that you could lose a lot of points, on
the other hand maybe you don't have any requirements in the lab to configure
something like this or your router plugs directly into the other router, or
maybe I'm just pulling this whole thing out of proportion and I worry about
too many little thing.
So please tell me what to do, but don't come back with answers like did you
check the TTL or time-outs etc. the fact is that the port stays powered and
the remote device attached to the switch still has a link lite, the
interface is just not passing traffic. Maybe cisco must change the command
on the switch from shut-down to block, cos that will be a more realistic
description.
And please tell me if I worry about too many little things.
TIA
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