nanog mailing list archives
Re: V4 via V6 and IGP routing protocols
From: Masataka Ohta <mohta () necom830 hpcl titech ac jp>
Date: Mon, 4 Apr 2022 23:24:31 +0900
Mark Tinka wrote:
MPLS with nested labels, which is claimed to scale because nesting represents route hierarchy, just does not scale because source hosts are required to provide nested labels, which means the source hosts have the current most routing table at destinations, which requires flat routing without hierarchy or on demand, that is, flow driven, look up of detailed routing tables of destinations at a distance.This detail is limited to PE devices (ingress/egress).
As it requires >> flat routing without hierarchy or on >> demand, that is, flow driven, look up of detailed routing tables >> of destinations at a distance. MPLS is just broken.
You don't need to carry a BGP table in the P devices (core), as only label swapping is required.
So?
Fair point, it is a little heavy for an edge box,
Requiring >> flat routing without hierarchy means it is fatally heavy for intermediate boxes. >> or on >> demand, that is, flow driven, look up of detailed routing tables >> of destinations at a distance. means it is fatally heavy for edge boxes. > In the end, having a flat L2 domain was just simpler. That's totally against the CATENET model. Why, do you think, NHRP was abandoned? > we've never ran into an issue carrying > thousands of IS-IS IPv4/IPv6 routes this way. Thousands of? Today with so powerful CPUs, that is a small network. So? Masataka Ohta
Current thread:
- Re: Enhance CG-NAT Re: V6 still not supported, (continued)
- Message not available
- Re: Enhance CG-NAT Re: V6 still not supported Abraham Y. Chen (Apr 06)
- Message not available
- Re: Enhance CG-NAT Re: V6 still not supported Abraham Y. Chen (Apr 06)
- Re: V6 still not supported Masataka Ohta (Apr 02)
- Re: V4 via V6 and IGP routing protocols Masataka Ohta (Apr 03)
- Re: V4 via V6 and IGP routing protocols Dave Taht (Apr 03)
- Re: V4 via V6 and IGP routing protocols Mark Tinka (Apr 04)
- Re: V4 via V6 and IGP routing protocols Dave Taht (Apr 04)
- Re: V4 via V6 and IGP routing protocols Masataka Ohta (Apr 04)
- Re: V4 via V6 and IGP routing protocols Mark Tinka (Apr 04)
- Re: V4 via V6 and IGP routing protocols Masataka Ohta (Apr 04)
- Re: V4 via V6 and IGP routing protocols Dave Taht (Apr 03)
- RE: V4 via V6 and IGP routing protocols Pascal Thubert (pthubert) via NANOG (Apr 03)
- Re: V4 via V6 and IGP routing protocols Mark Tinka (Apr 04)
- Re: V6 still not supported Ryland Kremeier (Apr 01)