Author: fabricplane

SRGB

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 …


SID

Segment Routing divides a network path into several segments which may include Nodes and links. And assigns a segment ID (SID) to each segment and forwarding node. A prefix segment identifier (SID) usually identifies a segment routing tunnel destination which is the loopback ip address of the destination node. An Adjacency Segment Identifier (adj-SID) is …


Segment Routing Policy Min Metric Optimization

Service Function Chaining

Service function chain (SFC) is used to provide ordered services for the application layer. With these ordered services, SFC logically connects services on network devices. These services can be L4-7 like firewalls, network address translation [NAT], intrusion protection, antivirus etc. SFC allows network administrators want to define the path for service processing. This Service Function …


EVPN Service Modes

EVPN is a standards-based BGP control plane to advertise MAC addresses, MAC and IP bindings and IP Prefixes. EVPN be used for both layer 2 services including p2p services and p2mp services and layer 3 services. The beauty of EVPN is, it provides single control plane solution for both Layer 2 and Layer 2 services …


BGP ORR

Route reflectors (RRs) propagate only their best path over their sessions by hiding the other paths. This may not be the best path according to client point of view. ORR (Optimal Route Reflection) can solve that kind of problem. Use case for ORR is to avoid reflecting all paths to the client. Because Client may …


End to End Segment Routing

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 …


VxLAN EVPN Symmetric IRB

The EVPN introduced the concept of Integrated Routing and Bridging based on EVPN to address inter-subnet communication between VMs which are belong to different VxLAN segments. It is also called inter-VxLAN routing with 2 options; Symmetric IRB and Asymmetric IRB. In the asymmetric IRB we only have the concept of L2VNI. We also have another …