I have experienced this on the TS-7500; I have some evidence that it is related
to the TS-7500 errata on Ethernet connectivity drops. Especially if you have
an older board, this happens all the time. To ameliorate:
* Make sure it's not connected to a managed switch, or that if it is Spanning
Tree is turned off on the switch
* If you need Spanning Tree, hopefully it has a Fast Link option to skip some
of the ST delay when a link comes back up.
* Static ARP entries also speed things up a tiny bit on reconnect.
* If you have an older board, the errata has a fix that greatly reduces the
time the link stays down. It's just a jumper between two of the pins on the
Ethernet connector (not any of the pins that actually go to the cable - 10-pin
connector, only 8 go to the cable of course).
--Drew Van Zandt
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