SRGB stands for Segment Routing Global Block. SRGB is a local property of a node and identifies labels reserved for global segments. In the MPLS Data Plane, Prefix-SIDs are allocated from Segment Routing Global Block (SRGB). It can be hard coded or it may be indexed to the SRGB. During the control plane advertisements both SRGB and …
An SR Policy is used to instantiate an ordered list of segments. If your path definition includes several segments, it can be encoded as a list of segment IDs. This SID List will be represented by an SR Policy. With SR Policy, there will not be state information on transit nodes because all path information …
Segment Routing (SR) is a kind of source routing technology which means that the source can define the path that the packet will take. In source routing with SR, the hosts determine the path, encodes the path information to the packet header. Segment Routing divides a network into several segments and assign a segment ID …
Segment Routing Flexible Algorithm (Flex-Algo) will provide easy way of calculating different paths with different type of constraints. It will allow us to define our own algorithm. This new algorithm can still be minimizing IGP metric but it can also be minimizing TE metric, minimizing delay metric (new metric definition added to IGP), avoiding some links or …
In the IGP based IP networks we have one simple algorithm and it calculates the shortest path to the destination according to planned IGP metric.IGP metric is the only constraint we can assign to the links. We have more with MPLS TE implementations like TE Metric, link admin group, bw etc. The problem with TE, …
TI-LFA also takes into account is SRLG exist in the network. Shared Risk Link Group (SRLG) is a set of links at the same risk of faults. If a link in an SRLG fails, other links also fail. In this case, if the other link in the SRLG functions as FRR backup to protect the failed …
IGP provides mechanisms through which Segment Routing interoperate with LDP. The control plane of segment routing can co-exists with LDP. If you plan to migrate from LDP to Segment Routing, or if you have some routers which does not support Segment Routing but you still want to use Segment Routing, Interoperability of SR and LDP will …
TI-LFA can add one or more segment when switching traffic to backup and loop free alternate path. According to below topology let’s assume we want to protect not only the link between Node-A and Node-B but we also want to protect Node-B. Without TI-LFA, we can’t protect Node-B. According to formula it seems it isn’t possible …