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AR Router Troubleshooting Guide

This Product Documentation provides guidance for maintaining AR Enterprise Router, covering common information collection and fault diagnostic commands, typical fault troubleshooting guide, and troubleshooting.
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Why Can IS-IS Neighbors Not Be Established?

Why Can IS-IS Neighbors Not Be Established?

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.

Updated: 2019-05-10

Document ID: EDOC1000079719

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