[c-nsp] vlan + mpls + mtu

[Florin Florian]

Hi Matteo,

There are some restriction applyed to EoMPLS:
MTU-EoMPLS does not support packet fragmentation and reassembly.
The ingress and egress routers must have the same MTU value.
The MTU of all intermediate links between endpoints must be sufficient to
carry the largest Layer 2 VLAN received.
Packet Format on EoMPLS are conform to the 802.1Q standard.

The minimum MTU size for Vlan should be set to 1522, 802.3 max frame size
1518 + 4 bytes for tagged frames.

Hope that help.
fflorin

On Thu, May 6, 2010 at 3:18 PM, Matteo Abrile <m.abrile at itelsi.com> wrote:

> Hi,
>
> I have 2 Cisco 6503, the first one in Italy and seconth in Germany connect
> by L2 Vlan by other carrier. This carrier have port connect to me with mtu
> 1500.
> I would come up mpls between this 2 router but usually I use mpls between
> cisco but with dark fiber and so I can set mtu as I want. In this scenario
> how can I set mtu ??
> Now I set, mtu 1500, ip mtu 1500 and mpls mtu 1500 but I feel with when
> I'll come up EoMPLS we have some problem. Now when I setup mpls with 2 cisco
> and dark fiber set mtu to 1518 and all seems work fine but I havan't
> experience in this scenario.
> Thanks
>
> Matteo
>
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