The MPLS WG Archive

[Juha Heinanen <jh@lohi.eng.telia.fi>]

this may have been discussed already, but why does
draft-kompella-mpls-l2vpn-01.txt require that the ce is configured with
the ce id, the ce's range and all labels in that range?  why can't the
ce dynamically add a new neighbor when it learns about a new label via
lmi, ilmi, or a corresponding mpls protocol?

i'm asking this because the proposed practice would be a step backwards
from how people have been running atm or fr vpns for years using cisco
cpe routers, where the only thing i need to configure is the
(sub)interface and an ip address.

here is a frame relay example:

interface Serial <number>
  ip address <address> <mask>
  encapsulation frame-relay IETF 
  ip ospf network point-to-multipoint 

and here is an atm example:

vc-class atm broadcast 
  broadcast 

interface ATM <number>
  atm pvc 2 0 16 ilmi 
  atm ilmi-pvc-discovery subinterface 

interface ATM <number>/<number> multipoint 
  ip address  address mask 
  ip ospf network point-to-multipoint 
  class-int broadcast 

dlcis or atm vcs of the other sites are learned dynamically via lmi or
ilmi.  as you see in above, the cpe doesn't even need to be configured
with its own ce id.

-- juha