I have not seen other responses so thought I would send something along.
I am not sure that I understand all the details of what you have. I dont
think that HSRP will have any impact either way on SDLLC.
If the primary router has SDLLC peering to a router at the central site,
will it still have IP connectivity to the central site if the T1 goes
down ? (Is there a dynamic routing protocol running over the ISDN and
will it advertise to the primary router an alternate route to the central
site ?) If the primary router does have IP connectivity, and if the
routing protocol converges quickly enough, I think that the SNA sessions
will survive.
Rick
On Tue, 9 May 2000, Dale Holmes wrote:
> I have 2 routers in a remote site. They are configured as a primary and a
> backup using HSRP.
>
> The primary has several serial attached SDLC devices that connect to a host
> at the central site using SDLLC. The primary conncts to the central site
> using a T-1 link. The primary and backup routers both reside on the same
> Ethernet segment.
>
> When the T-1 link fails, the workstations on the Ethernet segment can
> connect to the central site using the backup router, which has an ISDN
> interface that becomes active whenever the primary's T-1 fails. HSRP takes
> care of this - no problem...
>
> My questions are: How will the serially attached SDLC devices respond when
> the T-1 link fails? Will they be able to take advantage of the ISDN link on
> the backup router? What will happen to existing SNA sessions when the link
> fails?
>
> Any help on this would be appreciated. Unfortunately, I do not have a lab
> where I can adequately test this scenario...
>
> Thanks!
>
> Dale
> [=`)
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