[cisco-bba] How can Cisco CPE PPPoE MTU size adapt to MRU of LNS?
Frank Bulk - iNAME
frnkblk at iname.com
Sun Jun 8 13:51:57 EDT 2008
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
From: cisco-bba-bounces at puck.nether.net
[mailto:cisco-bba-bounces at puck.nether.net] On Behalf Of Victor Lyapunov
Sent: Sunday, June 08, 2008 8:10 AM
To: Teague, Christopher J
Cc: cisco-bba at puck.nether.net
Subject: Re: [cisco-bba] How can Cisco CPE PPPoE MTU size adapt to MRU of
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"
ip mtu adjust
I was hoping this to provide a solution but I was not able to test it
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
On 6/8/08, Teague, Christopher J <Christopher.Teague at mybrighthouse.com>
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
From: Victor Lyapunov <victor.lyapunov at gmail.com>
Sent: Sunday, June 08, 2008 5:47 AM
To: cisco-bba at puck.nether.net <cisco-bba at puck.nether.net>
Subject: [cisco-bba] How can Cisco CPE PPPoE MTU size adapt to MRU of LNS?
I have a question regarding the ability to adapt the MTU for a PPPoE
>From the LNS side using the commands:
ppp mtu adaptive
The LNS can apapt the length of the its MTU, according to the value set by
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
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
by the LNS?
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