[c-nsp] Best practice, MPLS and MTU settings

Aaron aaron1 at gvtc.com
Fri Oct 25 16:24:59 EDT 2013


I set all my mpls interfaces to....

9216 - ios xr (9k's)
9202 - ios (901's, 3600's)

Aaron

-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Mack
McBride
Sent: Friday, October 25, 2013 4:01 PM
To: Nick Hilliard; Eric A Louie; Cisco NSP
Subject: Re: [c-nsp] Best practice, MPLS and MTU settings

I concur with 9100.
Which providers have you run into problems with 9100?
I know certain cisco gear doesn't support packets that big for certain
links.
The 3750/3560 series for example only support 9000 on gigabit interfaces and
much smaller on 10/100 ports.

LR Mack McBride
Network Architect

-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Nick
Hilliard
Sent: Thursday, October 24, 2013 8:40 PM
To: Eric A Louie; Cisco NSP
Subject: Re: [c-nsp] Best practice, MPLS and MTU settings

On 25/10/2013 09:32, Eric A Louie wrote:
> If you used the method of increasing the MTU, what value did you use?

I aim towards a 9100 byte ip mtu, in order to guarantee a 9000 byte MTU for
customers with plenty of overhead on our side.  Sometimes this isn't
possible due to third party provider core link restrictions.

Nick

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