nanog mailing list archives
RE: Auto MDI/MDI-X + conference rooms + bored == loop
From: "Trey Valenta" <trey () arena net>
Date: Tue, 30 Mar 2010 08:35:08 -0700
I had a similar issue in which someone had accidentally looked a Cisco VoIP phone back into the network. However, I found it strange how often this would occur and eventually came across this field notice that might apply to others on the list: http://www.cisco.com/en/US/ts/fn/610/fn61863.html Problem Description Disconnecting power from a locally powered Cisco IP Phone connected to a non-Power Over Ethernet (POE) Cisco switch may expose the customer's network to loop back storms that destabalize the virtual local area network (VLAN). This exposure can be mitigated by configuring the switches with automatic loop detection and port recovery. Notes indicate this normally applies onto to 10Mb connections, but that there have been reported cases on a 100Mbit network when the VoIP phone is connected to a "highly sensitive uplink switch". Trey
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Current thread:
- Re: Auto MDI/MDI-X + conference rooms + bored == loop, (continued)
- Re: Auto MDI/MDI-X + conference rooms + bored == loop Owen DeLong (Mar 26)
- Re: Auto MDI/MDI-X + conference rooms + bored == loop Chuck Anderson (Mar 26)
- Re: Auto MDI/MDI-X + conference rooms + bored == loop Anton Kapela (Mar 26)
- Re: Auto MDI/MDI-X + conference rooms + bored == loop Chuck Anderson (Mar 26)
- Re: Auto MDI/MDI-X + conference rooms + bored == loop Anton Kapela (Mar 26)
- Re: Auto MDI/MDI-X + conference rooms + bored == loop Chuck Anderson (Mar 26)
- Re: Auto MDI/MDI-X + conference rooms + bored == loop Mark Foster (Mar 26)
- Re: Auto MDI/MDI-X + conference rooms + bored == loop Owen DeLong (Mar 26)
- Re: Auto MDI/MDI-X + conference rooms + bored == loop Mark Foster (Mar 26)
- Re: Auto MDI/MDI-X + conference rooms + bored == loop Owen DeLong (Mar 26)
- Re: Auto MDI/MDI-X + conference rooms + bored == loop John Kristoff (Mar 29)
- RE: Auto MDI/MDI-X + conference rooms + bored == loop William Mullaney (Mar 30)
- RE: Auto MDI/MDI-X + conference rooms + bored == loop Trey Valenta (Mar 30)
- Re: Auto MDI/MDI-X + conference rooms + bored == loop Michael Sokolov (Mar 26)
- Re: Auto MDI/MDI-X + conference rooms + bored == loop Owen DeLong (Mar 26)