Configuring Interface Participation in a Mesh Environment

Fully-meshed point-to-point topologies suffer from a potentially large amount of needless LSP flooding. At the trade-off of resiliency, interfaces can be restricted from flooding received LSPs.

To configure an interface for a mesh environment, use the following command:
configure isis [vlan all | {vlan} vlan_name] mesh [block-none | block-all | block-group group_id]
  1. To block the flooding of received LSPs altogether, use the mesh block-all option.
  2. To block the flooding of LSPs received on a specific group of interfaces (which are those with the same mesh group ID), use the mesh block-group group_id option.
  3. To remove blocking for an interface, use the mesh block-none option.