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jhubel
Beginner

PoE blinking on ASA 5505

Hi Community!

I have a 5505 firewall deployed in a home office with two 7941 telephones behind it.  The phones pull PoE from the ASA.  The firewall was deployed a couple weeks ago, and everything worked great for about 2 days.  (This configuration has been working for a couple years, but I just upgraded the 5505 to a new one with more RAM so I could run 8.3 and higher.)  Then the phones lost power from the ASA and they now "blink" about every 3 seconds.  They go on, off, wait three seconds, then go on, off, wait three seconds, etc.

I was not able to solve the problem by shutting and no shutting the ports, and there is little-to-nothing that you can do from the CLI to configure the PoE.  I changed software versions for troubleshooting, but the problem persists. A reboot fixes the problem for a couple days. Then, the problem reoccurs.

A "show power inline" yields the following when everything is working.

Home5505# sho power inline

Interface   Power   Device

---------   -----   ------

Et0/0        n/a    n/a

Et0/1        n/a    n/a

Et0/2        n/a    n/a

Et0/3        n/a    n/a

Et0/4        n/a    n/a

Et0/5        n/a    n/a

Et0/6        On    IEEE

Et0/7        On    IEEE

Home5505#

A "show power inline" yields the following when the phones are blinking.

Home5505# sho power inline

Interface   Power   Device

---------   -----   ------

Et0/0        n/a    n/a

Et0/1        n/a    n/a

Et0/2        n/a    n/a

Et0/3        n/a    n/a

Et0/4        n/a    n/a

Et0/5        n/a    n/a

Et0/6        Off    Cisco

Et0/7        Off    Cisco

Home5505#

This sounds like hardware to me, but I wanted to see if anyone has any bright ideas before I try to RMA it.  The device is running 8.4.6.

J

1 REPLY 1
Julio Carvajal
Advisor

Hello,

Agree with you,

There is no much we can do to troubleshoot this but as you said you have it working and after you get a new unit it stopped.

Regards

Julio Carvajal
Senior Network Security and Core Specialist
CCIE #42930, 2xCCNP, JNCIP-SEC
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