[c-nsp] TRUNK, MPLS and MTU

[Saku Ytti]

On (2006-01-09 18:28 +0530), Gautam wrote:

> If it is a trunk port, then it should accomdate 1 label and as an
> access-port, 2 labels. But would suggest using the entire jumbo
> size(1546/9000).

 I'm not absolutely sure what is tried to be said here. But you 
do need two labels (8 bytes) on all MPLS link. Even though
in reality in default configuration LSR->LER will be single 
label for L3 MPLS VPN. 1504 would not be enough for L3 MPLS VPN
as LER->LSR would need both labels and LSR<->LSR of course too.
 
 L2 VPN's then again can require quite lot more, combine ATM interworking
with FRR and you can easily top 1522.


> 
> Regds
> 
> 
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net]On Behalf Of Palis Michael
> Sent: Monday, January 09, 2006 5:38 PM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] TRUNK, MPLS and MTU
> 
> 
> Hello all
> 
> 
> 
> 
> 
>  We have an MPLS enable network and I have a question regarding trunk-switch
> interfaces. We set MTU size on all switch interfaces to 1526 in order to
> accommodate MPLS packets. Do we need to increase MTU above 1526 on switch
> trunk interfaces?
> 
> 
> 
> 
> 
> Thank you
> 
> 
> 
> 
> 
> 
> 
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-- 
  ++ytti