IS IS Mesh Groups

Introduction

Mesh groups are an optimization of the LSP flooding for fully meshed neighbors.

Mesh Groups

  • If ISIS routers are fully meshed, flooding of all LSP and paths can be resource intensive.
  • Flooding occurs to all neighbors, except the one that send it.
  • Mesh groups allow for creations of groups that don't flood LSP that come from the same group name.
  • There are three modes of mesh-group:
    • Blocked -
    • Inactive -
    • Set (named) -

Additional Resources

IS IS Multiarea Support - Cisco

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