Cisco 2950 Software Configuration Guide - Page 215
Cryptographic Software Image Guidelines, Setting Up the Switch to Run SSH, hostname, domain_name - trunk port
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Chapter 9 Configuring Switch-Based Authentication Configuring the Switch for Secure Shell Cryptographic Software Image Guidelines These guidelines apply only to non-LRE Catalyst 2950 switches: The SSH feature uses a large amount of switch memory, which limits the number of VLANs, trunk ports, and cluster members that you can configure on the switch. Before you download the cryptographic software image, your switch configuration must meet these conditions: • The number of trunk ports multiplied by the number of VLANs on the switch must be less than or equal to 128. These are examples of switch configurations that meet this condition: - If the switch has 2 trunk ports, it can have up to 64 VLANs. - If the switch has 32 VLANs, it can have up to 4 trunk ports. • If your switch is a cluster command switch, it can only support up to eight cluster members. Setting Up the Switch to Run SSH Follow these steps to set up your switch to run SSH: 1. Download the cryptographic software image from Cisco.com. This step is required. For more information, refer to the release notes for this release. 2. Configure a host name and IP domain name for the switch. Follow this procedure only if you are configuring the switch as an SSH server. 3. Generate an RSA key pair for the switch, which automatically enables SSH. Follow this procedure only if you are configuring the switch as an SSH server. 4. Configure user authentication for local or remote access. This step is required. For more information, see the "Configuring the Switch for Local Authentication and Authorization" section on page 9-32. Beginning in privileged EXEC mode, follow these steps to configure a host name and an IP domain name and to generate an RSA key pair. This procedure is required if you are configuring the switch as an SSH server. Step 1 Step 2 Step 3 Step 4 Command configure terminal hostname hostname ip domain-name domain_name crypto key generate rsa Step 5 Step 6 Step 7 end show ip ssh or show ssh copy running-config startup-config Purpose Enter global configuration mode. Configure a host name for your switch. Configure a host domain for your switch. Enable the SSH server for local and remote authentication on the switch and generate an RSA key pair. We recommend that a minimum modulus size of 1024 bits. When you generate RSA keys, you are prompted to enter a modulus length. A longer modulus length might be more secure, but it takes longer to generate and to use. Return to privileged EXEC mode. Show the version and configuration information for your SSH server. Show the status of the SSH server on the switch. (Optional) Save your entries in the configuration file. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 9-35
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