Where I work ISDN is primarily used for DDR since it is the most cost effective soln in Aust - especially if you have a large number of sites to cover as Jenny pointed out. With that in mind, the way of thinking being 'we only want to pay for what we use'. There's no point in having an fr circuit as backup for each remote/branch site.
Of course with our main core trunk links into the telco cloud we wouldn't consider ISDN for backup. The majority of issues regarding ISDN I have had experience over here are with provider's equipement (we have subscription to every major telco in aust. and only one telco [no names mentioned] seems to give us ongoing grief with their dated equipment - lucent att - framed route issues with ldap), and of course dialer watch :) The current configuration we have would fail bringing up the isdn circuit sporadically on a watched subnet. Resolution? changed dialer watch group to any other number BUT 1. Go figure. In regards to manual intervention.. i hope not :-) I have worked for the 2 major telco's in Aust and there's no manual intervention happening there in context of servicing their customers. MV -----Original Message----- From: Jenny McLeod [mailto:[EMAIL PROTECTED]] Sent: Tuesday, 24 September 2002 9:21 AM To: [EMAIL PROTECTED] Subject: RE: OT - ISDN viability - WAS: Re: VPDN - ISDN problem [7:53931] Hell yeah. We use ISDN to automatically failover. With over 350 remote sites, it's not uncommon to have a main link to an office fail somewhere. With automatic failover, our users often don't even know something's failed. Manual intervention? You've got to be kidding. To tweak and tune if necessary, sure, but to initiate failover - no way. Been there, done that, bad idea in our network. Anyway, in Australia at least, it's still the most cost-effective failover for a network like ours (lots of sites, geographically dispersed). It has some annoyances, sure - but it's still definitely an option for me. JMcL Chuck's Long Road wrote: > > I see more complaints / problems / issues with ISDN and DDR in > specific and > in general, in real world and in test situations. > > Idle curiousity. Is ISDN really viable in terms of reliability > for DDR > applications? > > In any number of mission critical applications, I have seen > major vendors, > major enterprises, and major service providers use manual > intervention as > the preferred means to apply dial backup. > > I welcome the informed comments of those who are obviously more > versed in > the topic than I am, with my limited exposure.. > > Chuck > > [snipped] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=53983&t=53983 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
