FAQ-Why Can IS-IS Neighbors Not Be Established

Publication Date:  2015-05-05 Views:  117 Downloads:  0
Issue Description
Why Can IS-IS Neighbors Not Be Established?
Solution
This has the following possible causes:
  • Point-to-multipoint (P2MP) interfaces do not support the Intermediate System to Intermediate System routing protocol (IS-IS).
  • The MTU of the Ethernet Interface is smaller than the max-size of IS-IS LSP packets plus 3.
  • The MTU of the point-to-point (P2P) interface is less than the length of the IS-IS LSP packet.
  • The two ends have different parameter configurations.

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