[nsp] 7206vxr pps & mbit/s limits

[Rafi Sadowsky]

## On 2003-10-27 19:33 -0500 jlewis at lewis.org typed:

[snip]
> 
> We recently moved a FE transit connection to it, and that seems to have 
> pushed it over (or at least a lot closer to) the edge.  If I add up all 
> the 30s avg bps/pps, I get (at this moment) 125mbit/s and 37kpps.  When we 
> moved that busy transit FE onto this router, we immediately started 
> getting fairly constant underrun errors on the interface and output drops.  
> I was able to considerably reduce the output drops by increasing the 
> hold-queue, and this may have even reduced the frequency of underruns, but 
> we still get them regularly.
> 
[snip]

Hi 

 Check out bug CSCdw50638 
==
If you notice that a Fast Ethernet on a 7200 is experiencing
incrementing overruns and output errors. You should check
to see if a "debug ethernet" is generating %DEC21140-3-UNDERFLO
(see below), you may have this bug.
==

 If so either upgrade IOS to a fixed version
or use this workaround (from bug CSCdw40633)
(please notice that this setting is global and NOT per interface)
==
Fix:
 To avoid high number of underruns on dec21140 type of FastEthernet
controllers, we can enable store and forward on the transmit side. The
command syntax (can be executed at config level) is "fastether transmit
store_and_forward enable" You will need to clear the fast ethernet
interface after setting this value ( clear int fastethernet<slot/subslot>).

 To disable just do: "no fastether transmit store_and_forward enable"
Caution: This feature (store and forward ) should be enabled only if the
underrun problem is very severe as in some traffic conditions it could
lead to some degradation in performance.  
==

 Hope that helps

-- 
	Rafi