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Configuration Guide - IP Unicast Routing

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of IP Unicast Routing, including IP Routing, Static Route, RIP, RIPng, OSPF, OSPFv3, IPv4 IS-IS, IPv6 IS-IS, BGP, Routing Policy, and PBR.
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(Optional) Creating OSPF Virtual Links

(Optional) Creating OSPF Virtual Links

Context

After OSPF areas are defined, OSPF route updates between non-backbone areas are implemented through a backbone area. Therefore, OSPF requires that all non-backbone areas maintain connectivity with the backbone area and that the backbone areas in different OSPF areas maintain connectivity with each other. However, it is not true in real world due to certain restrictions. To resolve this problem, you can configure OSPF virtual links.

Perform the following steps on a switch running OSPF.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run ospf [ process-id ]

    The OSPF process view is displayed.

  3. Run area area-id

    The OSPF area view is displayed.

  4. Run vlink-peer router-id [ smart-discover | hello hello-interval | retransmit retransmit-interval | trans-delay trans-delay-interval | dead dead-interval | [ simple [ plain plain-text | [ cipher ] cipher-text ] | { md5 | hmac-md5 | hmac-sha256 } [ key-id { plain plain-text | [ cipher ] cipher-text } ] | authentication-null | keychain keychain-name ] ] *

    A virtual link is created.

    This command must also be configured on the neighboring switch.

    If plain is selected, the password is saved in plain text in the configuration file, which brings security risks. It is recommended that you select cipher to store the password in cipher text.

    MD5 authentication and HMAC-MD5 authentication have potential security risks. HMAC-SHA256 authentication is recommended.

  5. Run commit

    The configuration is committed.

Follow-up Procedure

Different default MTUs may be used on devices provided by different vendors. Therefore, the MTU needs to be set to 0 by default in DD packets sent by interfaces. This ensures consistency. For details, see Configuring an Interface to Fill in the DD Packet with the Actual MTU.

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Updated: 2019-04-20

Document ID: EDOC1100074760

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