From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Tue May 31 2005 - 14:08:38 GMT-3
As I say in class, all you every want to know about SPIDs is if they are
needed in your lab and what they are if they are needed. You should
care less in the lab if they gave you no SPIDs, one SPID, or two SPIDs.
The only thing that you can do with SPIDs as far as the CCIE lab is
concerned is apply them using the isdn spid1/spid2 command. Other than
that there is nothing else to do with them.
If you want to understand how the configuration you mentioned below
works take a look at http://www.adtran.com and look at the Atlas 550 or
800 configuration guides. This should help you understand how to
configure the Adtran to rollover the call to the second channel.
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
ccie2be
Sent: Tuesday, May 31, 2005 7:55 AM
To: Group Study
Subject: Spids
Hi guys,
I haven't played around with this I a long time and so some of the
details
have become fuzzy but.
Let's say this is your config for the isdn between R4 and R5:
R4
Int bri 0/0
Ip addr x.x.x.1
dialer map ip x.x.x.2 broadcast 5551000
dialer load-threshold 10 either
dialer-group 1
isdn switch-type basic-ni
isdn spid1 0555200001 5552000
isdn spid2 0555400001 5554000
ppp multilink
And, the other end of the link has a similar config ie. 2 spids and ONE
dialer map command. Assume both config's are 100% correct as far as
switch
type, spids, Directory Numbers and ip addresses.
Notice that there are spids configured but only ONE dialer map command.
How
is it that once ppp multilink kicks in, the 2nd B-channel comes up?
Something under the hood must be going on in order for the 2nd B-channel
to
be brought up even though the directory number on both sides for the 2nd
channel is different than the directory number for the first B-channel
AND
there's not a 2nd dialer map for the L3 to L2 address resolution.
Can someone explain how this works?
Notice one other thing. 5551000 is the directory on R5 associated with
spid1 on R5 and 5553000 is the directory number on R5 associated with
spid2
on R5.
If the dialer map on R4 pointed to 5553000 instead of 5551000, would
that
make any difference?
Last thing. Are still any Cisco labs that are using spids? I'm pretty
sure
RTP no longer uses spids but it seems many of the rack rental and
workbook
vendors still use spids. Personally, I think its time for spids to
follow
appletalk and ipx into the dustbins of history. Anyone disagree?
Tim
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