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kvc
New Member

Serial Ports stop working arbitarily in 3660 Router.

Hi,

I have a 3660 Router with 4 NM 8A/S Cards with IOS version 12.2.12

Various Branches are connected to these cards thru serial line, HDLC.

After few days some ports of the router show that line protocol has gone down. But when i reload the router these lines come up.

The router logs only a message saying that line protocol went down.

So once i reload the router it works for about a week and then again the same

problem re-occurs. The Memory size for I/O is 25% of DRAM. DRAM is 64 Mb.

Show Tech does not show any errors.

Can anyone tell me what could be the problem.

Thanks

2 REPLIES

Re: Serial Ports stop working arbitarily in 3660 Router.

Does the interface, comes back up without reloading the router??

Can you clear counters, and provide output of show interface.

New Member

Re: Serial Ports stop working arbitarily in 3660 Router.

check if the main power supply is conditioned and have good ground.

--ejaj

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