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

Mark Tinka mark.tinka at seacom.mu
Sat Oct 26 11:07:01 EDT 2013

On Friday, October 25, 2013 10:24:59 PM Aaron wrote:
> I set all my mpls interfaces to....
> 9216 - ios xr (9k's)
> 9202 - ios (901's, 3600's)

Cisco's highest value is 9,216 bytes, while Juniper 
generally tops out at 9,192 bytes.

We alway match them (which means we never really top out the 
Cisco's) so that the IGP's (and other protocols) match 
automatically without having to manually setup each 
protocol, unless really necessary.

We've been in situations where we've had to modify customer-
facing protocol MTU because of "strange" hardware on their 
side that can't modify MTU, and only support 1,500 bytes, 
making the transfer of a full BGP table an issue (which 
could be fixed by setting the MSS in BGP itself a la 
Juniper, but only if that's what is facing the customer).

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