[c-nsp] MPLS Using SVI's?

[Gert Doering]

Hi,

On Thu, Apr 10, 2008 at 12:11:22PM -0500, Murphy, William  wrote:
> interface GigabitEthernet5/1
> 
>  switchport
>  switchport trunk encapsulation dot1q
>  switchport trunk allowed vlan 300,500,3000
>  switchport mode trunk
>  no ip address
> end

Make sure that you have jumbo MTUs configured on all physical interfaces,
because otherwise...

> interface Vlan3000
>  description L3_P1_TO_PE1
>  ip address 10.0.0.2 255.255.255.252
>  tag-switching mtu 1508

... this command will be accepted, but Gi5/1 will drop packets >1500
on transit.

I actually prefer "ip mtu 1508" (or even "1530") to "tag-switching mtu",
because that way I can test with "ping 10.0.0.1 size 1530 df-bit" that
it's *really* working.

gert
-- 
USENET is *not* the non-clickable part of WWW!
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
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