877 ADSL

I have just loaded an 877 with 15.1 IOS


the config is the same as i was using with 12.4

If the is no traffic through the modem for about 10 mins the ATM seems to go to sleep.

ping atm int a0 0 34 seg give no response

I can issue the " shut" "no shut" command to int ATM0 but this doesnt help.

Also tried disconnecting the DSL cable waiting 1 minute then plugging back in

Only way to get the ATM working is to reload the 877

With 12.4 i didnt have this problem, and i had ADSL firmware 4.0.15 loaded (adsl_alc_20190.bin)

Is there something new in 15.1 i am missing to keep it alive constantly

interface ATM0 description Physical ADSL (ATM) interface no ip address no atm ilmi-keepalive ! interface ATM0.1 point-to-point description Virtuele ADSL sub-interface ip address dhcp ip nat outside ip virtual-reassembly in atm route-bridged ip pvc 0/34 encapsulation aal5snap

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I found the the 877 just randomly hangs a hard reset is need to get the ADSL working again.

I returned to 12.4(24) and so far it works fine again

Looks like 15.1 needs a lot of working on. I'll wait a few month and try a newer version and trst that.

If any Cisco firmware guys read this and want more info i'll be only too happy to help.

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Interesting ...

Find below cropped output of my 876W. Never had this problem. I'm running it this way for months.


System image file is "flash:c870-adventerprisek9-mz.151-4.M.bin" Cisco 876W (MPC8272) processor (revision 2.0) with 236544K/25600K bytes of memory.

53248K bytes of processor board System flash (Intel Strataflash)
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I am using 15.1(2)T1 and 4.0.210 ADSL firmware and it is fine. I do have maxed out RAM fitted, so maybe 15.1 needs more RAM?

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Stephen Worthington

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