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Line Protocol On Cisco Switch

authentify
authentify asked
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Last Modified: 2012-05-09
I had and odd occurence that I am hoping someone could help explain....

I have a private T1 backchannel to a remote datacenter.  The T1 rides within a DS3 connected to a vendor router that then connects to my switch.  The connection (or T1 in this case) went down.  

This was the carrier's problem, however, them going down cause the VLAN line protocol to go down as well on my switch and any nodes connected tot hat VLAN.  In other words any host on that VLAN lost connection to every other host on other VLANS within the layer 3 switch I own.  It is important to note that it was the VLAN line protocol not an individual interface....the ENTIRE VLAN went down.  How is that possible.....

Thanks!!  Very desperate to figure out why and how that would happen.....
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