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AR500, AR510, and AR530 V200R007 Commands Reference

This document describes all the configuration commands of the device, including the command function, syntax, parameters, views, default level, usage guidelines, examples, and related commands.
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ssh server compatible-ssh1x enable

ssh server compatible-ssh1x enable

Function

The ssh server compatible-ssh1x enable command enables the SSH server's compatibility with earlier versions.

The undo ssh server compatible-ssh1x enable command disables the SSH server's compatibility with earlier versions.

By default, the server's compatibility with earlier versions is disabled.

Format

ssh server compatible-ssh1x enable

undo ssh server compatible-ssh1x enable

Parameters

None

Views

System view

Default Level

3: Management level

Usage Guidelines

Usage Scenario

An SSH server needs to be configured with backward compatibility for the version negotiation between the client and the server. When a TCP connection is set up between the client and server, the client negotiates with the server on the version of which the client and the server can work together.

The server compares the version of its own with that sent by the client, and determines whether it can work with the client.

  • If the protocol version on the client is earlier than 1.3 or later than 2.0, version negotiation fails and the server disconnects from the client.
  • If the protocol version on the client is equal to or later than 1.3 and earlier than 1.99, the SSH1.5 server module is invoked and the SSH1.X process is performed when the SSH1.X-compatible mode is configured. When the SSH1.X-incompatible mode is configured, version negotiation fails and the server disconnects from the client.
  • If the protocol version on the client is 1.99 or 2.0, the SSH2.0 server module is invoked and the SSH2.0 process is performed.

Precautions

  • The configuration takes effect upon the next login.

  • SSH2.0 has an extended structure and supports more authentication modes and key exchange methods than SSH1.X. SSH 2.0 can eliminate the security risks that SSH 1.X has. SSH 2.0 is more secure and therefore is recommended.

Example

# Enable the SSH server's compatibility with earlier versions.

<Huawei> system-view
[Huawei] ssh server compatible-ssh1x enable
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Updated: 2019-05-29

Document ID: EDOC1000097293

Views: 47844

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