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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D'>Unless you manage all the CPE, too, I think configuring your LNs
using “ip mss adjust” is the safest way to accomplish wide-spread functionality.
Providing working PPP services generally results a lowest-common-denominator configuration.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D'>Frank<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
cisco-bba-bounces@puck.nether.net [mailto:cisco-bba-bounces@puck.nether.net] <b>On
Behalf Of </b>Victor Lyapunov<br>
<b>Sent:</b> Sunday, June 08, 2008 8:10 AM<br>
<b>To:</b> Teague, Christopher J<br>
<b>Cc:</b> cisco-bba@puck.nether.net<br>
<b>Subject:</b> Re: [cisco-bba] How can Cisco CPE PPPoE MTU size adapt to MRU
of LNS?<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal>Hello Christopher<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>I was looking for a way that takes care of all types of
traffic. I have seen in previous IOS versions that<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>the pppoe-client requires the definition of
a vpdn-group.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>In the vpdn-group definition there is a command "ip mtu
adjust"<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>vpdn-group PPPoE<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> request-dialin<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> protocol pppoe<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> ip mtu adjust <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>I was hoping this to provide a solution but I was not able
to test it though.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>I am not sure how other CPEs (apart from Cisco) behave. At
least when the<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>PPPoE session is initiated from my windows PC it does not
take into account<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>the MRU of the LNS<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Thnx<br>
<br>
<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span class=gmailquote>On 6/8/08, <b>Teague, Christopher J</b>
<<a href="mailto:Christopher.Teague@mybrighthouse.com" target="_blank">Christopher.Teague@mybrighthouse.com</a>>
wrote:</span> <o:p></o:p></p>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'><a
href="http://www.cisco.com/en/US/tech/tk175/tk15/technologies_tech_note09186a0080093bc7.shtml"
target="_blank">http://www.cisco.com/en/US/tech/tk175/tk15/technologies_tech_note09186a0080093bc7.shtml</a><br>
<br>
I use the ip mss adjust command on the LNS to resolve MTU problems from my
CPEs, not exactly sure if this would help you or not but this seems pretty
flexible.<o:p></o:p></span></p>
<div class=MsoNormal align=center style='text-align:center'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
<hr size=2 width="100%" align=center>
</span></div>
<p class=MsoNormal style='margin-bottom:12.0pt'><b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'>From: </span></b><span style='font-size:
10.0pt;font-family:"Tahoma","sans-serif"'>Victor Lyapunov <<a
href="mailto:victor.lyapunov@gmail.com" target="_blank">victor.lyapunov@gmail.com</a>></span><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
</span><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Sent:
</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Sunday,
June 08, 2008 5:47 AM</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
</span><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>To: </span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><a
href="mailto:cisco-bba@puck.nether.net" target="_blank">cisco-bba@puck.nether.net</a>
<<a href="mailto:cisco-bba@puck.nether.net" target="_blank">cisco-bba@puck.nether.net</a>></span><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
</span><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Subject:
</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>[cisco-bba]
How can Cisco CPE PPPoE MTU size adapt to MRU of LNS?</span><o:p></o:p></p>
<div>
<div>
<p class=MsoNormal>Hello <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>I have a question regarding the ability to adapt the MTU for
a PPPoE session.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>From the LNS side using the commands:<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Virtual-template X<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> ppp mtu adaptive<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>The LNS can apapt the length of the its MTU, according to
the value set by the CPE.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>The question is how a cisco CPE (using IOS >= 12.4) can
do the same, adapt<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>its MTU to the MRU value advertised by the LNS?<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>I am using cisco 1700 for CPE with IOS 12.4. I could
not find a command similar<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>to the "ppp mtu adaptive" that could be used
inside the Dialer interface of the PPPoE client.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Does anyone knows how can a CISCO CPE adapt its MTU to the
MRU value advertised<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>by the LNS?<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Kind Regards<o:p></o:p></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div class=MsoNormal align=center style='text-align:center'>
<hr size=2 width="100%" align=center>
</div>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:gray'>CONFIDENTIALITY NOTICE: This e-mail may contain information that is
privileged, confidential or otherwise protected from disclosure. If you are not
the intended recipient of this e-mail, please notify the sender immediately by
return e-mail, purge it and do not disseminate or copy it.</span><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
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