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Configuring Secure Shell (SSH)

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3

Prerequisite for Using SSH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

Public Key Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

Steps for Configuring and Using SSH

for Switch and Client Authentication . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5

General Operating Rules and Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7

Configuring the Switch for SSH Operation . . . . . . . . . . . . . . . . . . . . . . 7-8

1. Assigning a Local Login (Operator) and

Enable (Manager) Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8

2. Generating the Switch’s Public and Private Key Pair . . . . . . . . . . . 7-9

Configuring Key Lengths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12

3. Providing the Switch’s Public Key to Clients . . . . . . . . . . . . . . . . . . 7-12

4. Enabling SSH on the Switch and Anticipating SSH

Client Contact Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15

5. Configuring the Switch for SSH Authentication . . . . . . . . . . . . . . . 7-19

6. Use an SSH Client To Access the Switch . . . . . . . . . . . . . . . . . . . . . 7-23

Further Information on SSH Client Public-Key Authentication . 7-23

Messages Related to SSH Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-29

Logging Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-30

Debug Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-30

7-1

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