page_title: Shared Risk Resource Group
section_title: SRNG
hierarchical_section_title: Shared Risk Resource Group / Types of SRRGs / SRNG
caption_attribution_description: English: example of SNRG
context_page_description: Shared risk resource group is a concept in optical mesh network routing that different networks may suffer from a common failure if they share a common risk or a common SRG. SRG is not limited to Optical mesh networks: SRGs are also used in MPLS, IP networks, and synchronous optical networks.
  An SRG failure makes multiple circuits go down because of the failure of a common resource those networks share. There are three main shared risk groups:
  Shared risk link group
  Shared risk node group
  Shared risk equipment group.
  Failure recovery is a crucial in all types of networks. The MPLS as well as the IP network uses the high speed capabilities of modern optical networks. SRLGs typically deal with links between fiber optic nodes, but that is not always the case. SRLG can also be modeled if the links contain transmission lines instead of fiber optic cable. SRG modeling is also used when a provider generates a service-level agreement with a client with various protection schemes.
context_section_description: In optical mesh networks, nodes are junctions of fiber spans. Some nodes might contain highly sophisticated routing equipment— while others may be just a patch panel. Whatever the case, a node is a shared risk node group—because if the node fails, the failure affects all signals through that particular node.
caption: Example of SRNG
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