[nsp] Problems with Half Bridge PVC in Access Routers

Troncoso, Esteban - (Chi) esteban.troncoso at attla.com
Fri Nov 28 12:53:27 EST 2003

OK. This configuration show you the interface of customer. This customer
have the WebPage www.din.cl. Some users of Internet can access this page
without problems, but others user can't to access. It's very strange.

class-map match-all CALL
  match any 
policy-map C10M
  class CALL
    shape peak 10000000 10000000 0
interface ATM0/1/0
 description !!Hacia Linea 5.1 clsrob1
 no ip address
 no ip directed-broadcast
 logging event subif-link-status
 no atm enable-ilmi-trap
 no atm ilmi-keepalive
interface ATM0/1/0.10 multipoint
 mtu 1500
 ip address
 no ip directed-broadcast
 atm pvc 8 0 112 aal5snap bridge
 no atm enable-ilmi-trap
 service-policy output C10M

-----Mensaje original-----
De: Gert Doering [mailto:gert at greenie.muc.de]
Enviado el: viernes, 28 de noviembre de 2003 12:32
Para: Troncoso, Esteban - (Chi)
CC: cisco-nsp at puck.nether.net
Asunto: Re: [nsp] Problems with Half Bridge PVC in Access Routers


On Fri, Nov 28, 2003 at 12:17:06PM -0300, Troncoso, Esteban - (Chi) wrote:
> We have implemented Half Brigde PVC in our Access Routers, in order to
> increase the capacity for access customers (using IRB, the limit is 255 by
> router) over ATM, RFC-1483.
> Sometimes, when we have provisioned customers, they have found some of
> follows problems:
> .- Can't send mail with files attached.
> .- Their own Web Pages can't be access from Internet.
> When we move this customers to IRB, the problems disappear.
> Our platform is Cisco 7507, with IOS 12.0(25)S2, Service PRovider

Sounds like problems with MTU or with traffic policing on the path
between the customer and you.  If it goes away with IRB, it's likely to 
be a MTU problem.

Can you show the configuration for one of the problematic interfaces?

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

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