Hi Folks, What would be the drawbacks of using SPF/linkstate-based BGP for label propagation instead of ISIS or OSPF as IGP&LDP?
My point is: For simple single AS deployments SR is a great simplification and brings many enhancements. But as soon as you start to migrate your access areas into MPLS, ISIS might start to get stuffed with high number of prefixes that it's not designed to cope with, so you might need to involve the RFC3017 based Unified/Seamless MPLS. Also from the perspective of inter-AS MPLS backbones based on RFC3017 -these networks can only leverage SR within the single AS. Of course SR promises excellent high speed local-AS based convergence near egress PE -as mentioned in section 3.3. of the Segment Routing Use Cases draft -so there would be no need to wait for the RFC3017 to converge and the PIC-core to kick in at the ingress PE. But still the end to end LSP would have to be built using a combination of SR & RFC3017. So if such an essential change is being introduced into MPLS control and data plane, why not to use link-state BGP as IGP&LDP? adam _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
