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Hello Christopher

I was looking for a way that takes care of all types of traffic. I have seen
in previous IOS versions that
the pppoe-client requires the definition of a vpdn-group.

In the vpdn-group definition there is a command "ip mtu adjust"

vpdn-group PPPoE
request-dialin
protocol pppoe
ip mtu adjust

I was hoping this to provide a solution but I was not able to test it
though.

I am not sure how other CPEs (apart from Cisco) behave. At least when the
PPPoE session is initiated from my windows PC it does not take into account
the MRU of the LNS

Thnx


On 6/8/08, Teague, Christopher J <Christopher.Teague@mybrighthouse.com>
wrote:
>
>
> http://www.cisco.com/en/US/tech/tk175/tk15/technologies_tech_note09186a0080093bc7.shtml
>
> 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.
>
> ------------------------------
> From: Victor Lyapunov <victor.lyapunov@gmail.com>
> Sent: Sunday, June 08, 2008 5:47 AM
> To: cisco-bba@puck.nether.net <cisco-bba@puck.nether.net>
> Subject: [cisco-bba] How can Cisco CPE PPPoE MTU size adapt to MRU of LNS?
>
> Hello
>
> I have a question regarding the ability to adapt the MTU for a PPPoE
> session.
>
> From the LNS side using the commands:
>
> Virtual-template X
> ppp mtu adaptive
>
> The LNS can apapt the length of the its MTU, according to the value set by
> the CPE.
>
> The question is how a cisco CPE (using IOS >= 12.4) can do the same, adapt
> its MTU to the MRU value advertised by the LNS?
>
> I am using cisco 1700 for CPE with IOS 12.4. I could not find a command
> similar
> to the "ppp mtu adaptive" that could be used inside the Dialer interface of
> the PPPoE client.
>
> Does anyone knows how can a CISCO CPE adapt its MTU to the MRU value
> advertised
> by the LNS?
>
> Kind Regards
>
> ------------------------------
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>

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.



Frank



From: cisco-bba-bounces@puck.nether.net
[mailto:cisco-bba-bounces@puck.nether.net] On Behalf Of Victor Lyapunov
Sent: Sunday, June 08, 2008 8:10 AM
To: Teague, Christopher J
Cc: cisco-bba@puck.nether.net
Subject: Re: [cisco-bba] How can Cisco CPE PPPoE MTU size adapt to MRU of
LNS?



Hello Christopher



I was looking for a way that takes care of all types of traffic. I have seen
in previous IOS versions that

the pppoe-client requires the definition of a vpdn-group.



In the vpdn-group definition there is a command "ip mtu adjust"



vpdn-group PPPoE

request-dialin

protocol pppoe

ip mtu adjust



I was hoping this to provide a solution but I was not able to test it
though.



I am not sure how other CPEs (apart from Cisco) behave. At least when the

PPPoE session is initiated from my windows PC it does not take into account

the MRU of the LNS



Thnx



On 6/8/08, Teague, Christopher J <Christopher.Teague@mybrighthouse.com>
wrote:

http://www.cisco.com/en/US/tech/tk175/tk15/technologies_tech_note09186a00800
93bc7.shtml

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.

_____

From: Victor Lyapunov <victor.lyapunov@gmail.com>
Sent: Sunday, June 08, 2008 5:47 AM
To: cisco-bba@puck.nether.net <cisco-bba@puck.nether.net>
Subject: [cisco-bba] How can Cisco CPE PPPoE MTU size adapt to MRU of LNS?

Hello



I have a question regarding the ability to adapt the MTU for a PPPoE
session.



>From the LNS side using the commands:



Virtual-template X

ppp mtu adaptive



The LNS can apapt the length of the its MTU, according to the value set by
the CPE.



The question is how a cisco CPE (using IOS >= 12.4) can do the same, adapt

its MTU to the MRU value advertised by the LNS?



I am using cisco 1700 for CPE with IOS 12.4. I could not find a command
similar

to the "ppp mtu adaptive" that could be used inside the Dialer interface of
the PPPoE client.



Does anyone knows how can a CISCO CPE adapt its MTU to the MRU value
advertised

by the LNS?



Kind Regards



_____

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.