Cisco 7206 IOS for PPPoE Termination

PC paul4004 at
Sun Sep 23 19:47:35 UTC 2012

For this application, you may wish to consider the service provider images.

The latest 15.x(S) image works, as it is the derivative of what was
formerly the service-provider oriented 12.2(SRx) images.

However, it's unlikely to drop steady state CPU, but it may contain some
optimizations for concurrent PPP (re)negotiations on the G2 platform during
session recovery.

PPPoE will generally handle more users on ethernet as it is easier to push
packets on when not dealing with the ATM encapsulations, but to what extent
this holds true on the 7200, I can't tell you for sure.

I'd also read the broadband aggregation guide under the IOS documentation
on, and tune all the knobs that may help you, there are some
pointers on what items on virtual-templates are punitive in performance,
other optional items such as disabling SNMP counters on virtual access
interfaces to reduce cpu usage, and other items that may help little by
little.  There are also various knobs to throttle PPPoE renegotiation rates
during recovery.

I wish you luck (and consider getting another and/or bigger router to split
the load).

On Sun, Sep 23, 2012 at 1:23 PM, Shahab Vahabzadeh
<sh.vahabzadeh at>wrote:

> Which software you used before for them?
> On Sun, Sep 23, 2012 at 10:43 PM, Rinse Kloek <rinse.kloek at
> >wrote:
> > 6000 PPP users on a NPE-G2 is way too much imho. Currently we do no more
> > than 3000 users on a NPE-G2 with PPPoA. (Max cpu 50%).
> > 5 years ago, we did about 5000 users on a NPE-G2, but as traffic ratio's
> > grow each year the maximum users a NPE-G2 can handle will drop each year.
> > Don't forget an NPE-G2 is a software based plaform, so traffic forwarding
> > is done in software CPU.
> >
> > regards,
> > Rinse Kloek
> > Op 23-9-2012 20:51, Shahab Vahabzadeh schreef:
> >
> >> Hello everybody,
> >> I am using C7206 VXR NPE-G2 routers as BRAS in my network and the
> current
> >> IOS is *c7200p-adventerprisek9-mz.**124-24.T.bin* on them.
> >>
> >> Also their memory upgraded to 2GB instead of 1GB.
> >> And I have near 6500 online user on each of my BRAS and there is no
> >> speciefic feature except aaa with radius and ordinary features.
> >> There router is also terminating dot1q too because my PSTN centers
> traffic
> >> comes through dot1q vlans to BRAS es.
> >> I think I have some problem with current IOS, My CPU Usage is abnormal
> and
> >> Its near %70 or %80.
> >> And when I have a network problem and some of PSTN centers goes down CPU
> >> go
> >> to %99 and it gets problem to recovery.
> >> Do you know any good IOS for me as a service provider to use?
> >> I heard that some service providers have near 8000 online user on 7206.
> >> Thanks
> >>
> >>
> --
> Regards,
> Shahab Vahabzadeh, Network Engineer and System Administrator
> Cell Phone: +1 (415) 871 0742
> PGP Key Fingerprint = 8E34 B335 D702 0CA7 5A81  C2EE 76A2 46C2 5367 BF90

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