[c-nsp] Adjusting MTU on 802.1q links

[Phil Mayers]

On 03/12/10 13:49, Matthew Huff wrote:
> I don't know why it never occurred to me, but on 802.1q trunk links,
> non-native vlans are encapsulated within 802.1q headers, therefore
> max packets would have to be fragmented. On trunks that support it,
> should standard practice to bump up the mtu on both sides to account
> for the 802.1q header.

No. 802.1q trunks do this automatically i.e. bump MTU from 1518 to 1522 
to account for the extra space. I've never seen a switch platform that 
needed any special config for this to work.