SR
SR-MPLS – Fallback for inetcolor.0
1. Intro This is a continuation of the previous post: SR-MPLS – Static colored LSP. There we configured a colored LSP and we saw how the next-hop is installed in the inetcolor.0 table. But, what will happen if that LSP goes down? With no more valid next-hops in the inetcolor.0 table the traffic will be […]
SR-MPLS – TI-LFA
1. Intro Loop-free alternate (LFA) and remote LFA have been used to provide fast-reroute protection for several years. With LFA, a point of local repair (PLR) determines whether or not a packet sent to one of its direct neighbors will reach its destination without looping back through the PLR. In a typical network topology, perhaps […]
SR-MPLS – Anycast
1. Intro An IGP anycast segment is an IGP prefix segment that identifies a set of routers. An anycast segment enforces forwarding based on the equal-cost multipath-aware shortest-path toward the closest node of the anycast set. Within an anycast group, all the routers advertise the same prefix with the same SID value, which facilitates load […]
SR-MPLS – S-BFD
1. Intro In the previous post we configured a static LSP. That configuration is easy to configure but, like all static paths, cannot react to topology changes. If one of the links or nodes represented by your segments fail, then the entire path fails. Another disadvantage of this option is that it cannot inherently identify […]
SR-MPLS – Static non-colored LSP
1. Intro The segment routing architecture enables the ingress devices in a core network to steer traffic through explicit paths. You can configure these paths using segment lists to define the paths that the incoming traffic should take. SR is a control-plane architecture that enables an ingress devices in a core network to steer traffic […]