Hi jenny,
Yes, I agree that with floating static routes backup
delay command would not work.
When my serial link is completely down then the ISDN
backup works perfectly well. It is only when the
serial link is flapping that the real problem comes up
as neither the condition of the link is good enough to
handle the load nor does it allow ISDN to takeover.
In such situations how can I prevent downtime by
allowing the ISDN to take the load.
Secondly I wanted to increase the ISDN bandwidth by
adding more ISDN lines.( The present bw is 128kbps
(multilink enabled)
Any hints/suggestions on that would also be
appreciated.
Thanks & Regards
Amit
You don't need to use the backup delay command if
you're using floating
static routes for backup, in fact I'm not sure that it
will actually do
anything (how does it know what the secondary
interface is without a backup
interface command?), but I've never actually tried
using it with floating
statics.
Using floating statics, how quickly the backup line
kicks in should depend
on the convergence time of your routing protocol and
design. EIGRP should
be pretty quick, generally.
What puzzles me, though, is the statement 'isdn backup
is not able to
activate (momentarily activates and then
disconnects)'. Do you mean that
the ISDN call doesn't work, or that the call is
disconnecting before the
idle timer expires or what?
Generally (depending on bits of the config that you
haven't shown), if the
serial link goes down for long enough for the routing
table to point to the
ISDN instead, the ISDN will call and will stay up for
at least 120 seconds
(default idle time), even if the routing quickly
reconverges back to the
serial.
If the serial link goes down (or has errors) for such
a short period that
the routing table does not point to the ISDN, then the
ISDN won't call at
all.
Does it work OK when the serial link goes down and
stays down? If so, how
quickly does the ISDN activate?
If the serial link is flapping, is the ISDN call
(including PPP negotiation
if you're using PPP) successful? debug isdn q931 and
debug ppp neg or
debug ppp auth may show any connection problems, and
debug dialer may show
why it is disconnecting.
JMcL
---------------------- Forwarded by Jenny
Mcleod/NSO/CSDA on 14/12/2000
09:06 am ---------------------------
Jim Barksdale
<[EMAIL PROTECTED]>@groupstudy.com on
14/12/2000
04:28:45 am
Please respond to Jim Barksdale
<[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
cc:
Subject: Re: Re : ISDN Backup
You do not have to use the BACKUP INTERFACE command,
that is just another
way of doing
it. I like the floating static commands much better,
I can test the ISDN
connectivity
without having to take the serial interface down. And
the Backup Interface
command does
not work very well in a frame relay situation.
I do agree you need to add the commands for Backup
Delay, both for going to
ISDN and
going back to the primary.
As for preventing the WWW traffic when on ISDN, apply
an access list to the
BRI to
prevent it.
Taiwo Adeshugba wrote:
> I think you are missing some commands from the
config on your router. if
you
> want to back up the interface you have to use the
BACKUP INTERFACE
command
> on the primary interface. And to have a threshold
level you need to use
the
> command BACKUP DELAY, and for the threshold you need
to use the command
> BACKUP LOAD which will be a percentage of the
primary line's available
> bandwidth that the traffic load must exceed to
enable dial backup.
> The best thing is to send the output of the Running
congfig and we can
take
> it from there as I think I am walking blindly into
this.
> Tai
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of
> Amit Gupta
> Sent: 13 December 2000 11:27
> To: [EMAIL PROTECTED]
> Subject: Re : ISDN Backup
>
> Hi All,
>
> I am using the following config on my router.
>
> router eigrp xxx
> redistribute static
> passive-interface BRI1/0
> network x.x.x.x
> distribute-list 2 out Serial0/0
> !
> ip route 0.0.0.0 0.0.0.0 Serial0/0
> ip route 0.0.0.0 0.0.0.0 bri1/0 150
>
> I am using ISDN as the backup interface.
> The problem is that when my Serial link is erratic
> (not down), isdn backup is not able to activate
> (momentarily activates and then disconnects)
> what feature should I use to activate my backup
> immediately as soon as it senses a break in the
serial
> link.
> Can I set some threshold level?
>
> Secondly I wanted to stop the www traffic when my
ISDN
> backup is up ??
> Any suggestions.
>
> Thanks & Regards
>
> Amit
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