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Configuration Guide - IP Unicast Routing

S7700 and S9700 V200R011C10

This document describes IP Unicast Routing configurations supported by the switch, including the principle and configuration procedures of IP Routing Overview, Static Route, RIP, RIPng, OSPF, OSPFv3, IS-IS(IPv4), IS-IS(IPv6), BGP, Routing Policy ,and PBR, and provides configuration examples.

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(Optional) Creating OSPF Virtual Links

(Optional) Creating OSPF Virtual Links


After OSPF areas are defined, OSPF route updates between non-backbone areas are transmitted through a backbone area. 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. In real world situations, it may be impossible to meet this requirement because of certain restrictions. To resolve this problem, configure OSPF virtual links.

Perform the following steps on the switch running OSPF.


  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.

    The vlink-peer (OSPF area) command must also be configured on the neighboring switch.

    If plain is selected, the password is saved in plaintext in the configuration file. To improve security, you are advised to select cipher to save the password in ciphertext.

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

Follow-up Procedure

After virtual links are created, devices from different vendors may use different default MTUs. The MTU is set to 0 by default for interfaces to send DD packets, which ensures compatibility. For details, see Configuring an Interface to Fill in the DD Packet with the Actual MTU.

Updated: 2020-02-04

Document ID: EDOC1000178324

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