On 11/Jun/20 19:19, Saku Ytti wrote:
The demand is, we need tunneling, then the question is what are the metrics of a good tunneling solution. By answering this honestly, MPLS is better. We could do better surely, but IP is not that.
One unexpected benefit, I will say, with going native LDPv6 is that MTR's for IPv6 destinations no longer report packet loss on the intermediary core routers (CRS-X). I know this was due to the control plane, and nothing to do with the actual data plane, but it was always a tool explaining to customers why MTR's for IPv4 destinations have 0% packet loss in our core, while IPv6 ones have 30% - 50% (in spite of the final end-host reporting 0% packet loss). Since going LDPv6, IPv6 traffic is now label-switched in the core, in lieu of hop-by-hop IPv6 forwarding. The unforeseen-but-welcome side effect is that customer packet loss MTR's for IPv6 destinations that traverse the CRS-X core are as 0% as they are for IPv4 (even though we haven't yet removed BGPv6 from the core due to IOS XE platforms that don't yet run LDPv6). One less trouble ticket to have to explain for our NOC; I'll gladly take that... As my Swedish friend would say, "That gives me an avenue of pleasure and joy" :-). Mark.