The MPLS WG Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Layer 3 Lookup in ATM LSR's
Giles, I think your point is valid, however, I also think David was making a reasonable simplification - logically, if the ingress interface 'pops' the label it would do so so that it can perform a new lookup on either the next label, or the IP header (if the popped label was the last label). Eric W. Gray Systems Architect Celox Networks, Inc. egray@celoxnetworks.com 508 305 7214 -----Original Message----- From: Giles Heron [mailto:giles@packetexchange.net] Sent: Tuesday, August 06, 2002 10:50 AM To: David Charlap Cc: IETF MPLS List Subject: Re: Layer 3 Lookup in ATM LSR's just one nit... On Mon, 2002-08-05 at 19:02, David Charlap wrote: [snip] > Lookup capability is also needed for a router (or interface) that must > pop the label stack. It must do a label-lookup (which all switches can > do), but it must then pop the stack and then do an IP lookup on the > result before forwarding. This is beyond the capability of most ATM > forwarding hardware. [rest snipped] this isn't strictly, true - is it? in some cases you may pop the stack but then forward the IP payload without actually performing an IP lookup (e.g. PHP). Giles -- ================================================================= Giles Heron Principal Network Architect PacketExchange Ltd. ph: +44 7880 506185 "if you build it they will yawn" ================================================================= |
|