From: Kenneth Wygand (KWygand@customonline.com)
Date: Thu Jun 17 2004 - 22:00:25 GMT-3
Hello,
For those that have worked on NetMasterClass's sample lab - There is an ISDN link that is supposed to "come up only when Frame Relay connection is down". My assumption is that this ISDN link should provide full functionality for the rest of the lab configuration when it comes up. Consequently, for a BGP session that goes over that Frame Relay link, my thought is that you should have to neighbor-up with Loopback interfaces so the BGP session will remain active even when the ISDN link is employed. However, the answer key illustrates the BGP peering done on the directly-connected serial links.
For the real lab, should we assume if the ISDN link is "backing up" another connection, that all required functionality over the connection should *also* be "backed" up? Of course, if something like an OSPF virtual link is required over the serial interface that's being backed up by ISDN, I'm *assuming* the virtual-link would also be required over the ISDN circuit. But how far do we go with this madness?
If this is the case, I can't even imagine having enough time at the end of my lab to "down" my primary interface and ensure full connectivity (basically the entire lab) still functions properly via this "backup" interface.
Any thoughts?
Thanks,
Ken
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