[c-nsp] mpls ip creating traffic disturbance(s)

[chip]

I seem to recall some odd MTU actions that routers will do if mpls is
enabled and those actions differing depending on whether it was Ethernet or
a serial link.  I can't seem to nail down the specifics, my google-fu is
failing.  Something like the interface MTU increasing on a serial
interface.  Whereas the ipmtu decreasing on Ethernet interfaces.

--chip



On Tuesday, January 15, 2013, Eric A Louie wrote:

> No, the MTU was set to 1500.  I have been informed that the tags create a
> few
> bytes of overhead that would cause problems in  packets where DF was set.
>  But
> even traffic that didn't traverse the mpls ip link was (seemingly) affected
>
>  Much appreciated, Eric
>
>
>
>
> ________________________________
> From: Oscar Belmar <belmar.oscar at gmail.com <javascript:;>>
> To: Eric A Louie <elouie at yahoo.com <javascript:;>>
> Sent: Tue, January 15, 2013 4:45:57 PM
> Subject: Re: [c-nsp] mpls ip creating traffic disturbance(s)
>
>
> Did you change system or link MTU?
> OBM
> El 15/01/2013 21:27, "Eric A Louie" <elouie at yahoo.com <javascript:;>>
> escribió:
>
> We implemented what seemed to be a pretty simple mpls configuration to
> test a
> >vrf config.
> >
> >It caused widespread havoc across my production network.
> >
> >Has anyone encountered a situation where they've put "mpls ip" on a link
> and
> had
> >it cause problems with web browsing to the Internet, even on traffic that
> passed
> >through the router that was not going through the mpls ip interfaces?
> >
> >I have a case open with Cisco TAC but was looking for some additional
> guidance
> >and perhaps some experience around this strange problem.
> >
> > Much appreciated, Eric
> >_______________________________________________
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> >
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-- 
Just my $.02, your mileage may vary,  batteries not included, etc....