From: Nauman Khan (mustafa@247emails.com)
Date: Sat Jan 24 2004 - 03:52:59 GMT-3
HI Yasser,
Please see comments inline....
--- "Yasser Aly" <blackyeyes00@hotmail.com> wrote:
Dear All,
> In the scenario I am working on, the task askes to bring both B >channels once the main link fails
>
?I am having troubles in bringing the 2nd link up - sometimes it takes >long time to come up, sometimes it doesn't come up at all -. I have >applied "
>dialer load-threshold 1 either & ppp multilink " under the bri.
If you are using load-threshold to bring up the second link, I beleive
the same phone # is dialed. If the first channel is in used, it should automaticall rollover to the 2nd channel. But if the hunt group is not set up for both channels on the switch side, then it will report user busy since it checks only the first channel and does not rollover to the second.
To test this, configure a second dialer map ip statement using the second spid of the remote for the second phone # and see if the second
channel comes up, irrespective of the load threshold.
Use debug q931 to see if alteast your router is trying to dial to bring up the second channel.
Also,sometimes missing LDN is also the cause of b-channel not coming up.
>Would you kindly provide your thoughts for the following questions and
>whether any would solve the problem:
>1) Will it make a difference if I used under the BRI " dialer string
><remote_number> rather than using
?dialer map ip <remote_ip> broadcast <remote_number> ?
Normally, you would use dialer string on a p2p link i.e when there is only one possibility to dial and there is no confusion on what string to dial to reach a certain destination.
Rouer A -------------------Router B
You use dialer map when there are/can_be multiple destinations from the
dialing router. Then you must use dialer map and map the ip address and hostname of the called router with the appropriate dialer string .
Router A |-------------Router B
|-------------Router C
I always use dialer map as it will work for both.
>2) The ISDN switch type is basic-ni. Do I need to define both SPID >numbers ?
For national switch-type i.e basic-ni, normally you need the SPIDs and LDN in order for.
Layer 1 active
Layer 2 Multiple Frames Established
For basic-5ess, normally you don't require spids to be specified.
>I heard before that it is generally speaking not needed at all to >define the 2nd SPID number ?
YES !! Only one should suffice if second is not known/given
>Is this true, and if so then when to define the 2nd SPID number ?
You would need the second spid numbers if you want to bring the second channel up without considering load threshold. If you only specify one spid, then the second channel will only come up once your configured load threshold is corssed. (Somebody can correct me if I am wrong)
3) Will it make a difference using dialer profiles than using Legacy DDR ?
My understanding is that , you use dialer-profiles when you have scenario 2 above but the destination is configured in such a way that
some of the parameters are different for each destination.
For e.g
if Router A can dial both Router B and Router C.
For Router B, you want the dialer idle-timeout to be 20 sec and for Router C you want dialer idle-timeout to be 100 seconds, then you would create two profiles and put different idle-timeout in each profile.
If the parameters are same, then you don't "need" to (but you can) create dialer profiles and just put x dialer map statements for x destination under you bri interface of calling router A.
..just my 2 cents.
Best Regards,
Nauman
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