Nortel Networks 4050 User Manual

Chapter 1 Overview 39

Nortel Secure Network Access Switch 4050 User Guide

 

The Nortel SNAS 4050 supports the use of three different SSH host key types: 

•

RSA1

•

RSA

•

DSA

SSH protocol version 1 always uses RSA1 keys. SSH protocol version 2 uses 
either RSA or DSA keys.

For management communications in the Nortel SNA solution, the Nortel 
SNAS 4050 can act both as SSH server (when a user connects to the CLI using an 
SSH client) and as SSH client (when the Nortel SNAS 4050 initiates file or data 
transfers using the SCP or SFTP protocols).

For information about managing SSH keys for communication between the Nortel 
SNAS 4050 and the network access devices, see 

.

For information about managing SSH keys for Nortel SNAS 4050 management 
communications, see 

.

A cluster is a group of Nortel SNAS 4050 devices that share the same 
configuration parameters. Nortel Secure Network Access Switch 
Software Release 1.0 supports two Nortel SNAS 4050 devices, or nodes, in a 
cluster. A Nortel SNA network can contain multiple clusters.

Clustering offers the following benefits:

•

manageability — The cluster is a single, seamless unit that automatically 
pushes configuration changes to its members.

•

scalability — The Nortel SNAS 4050 nodes in a cluster share the burden of 
resource-intensive operations. The cluster distributes control of the network 
access devices between the Nortel SNAS 4050 nodes and distributes handling 
of session logon. As a result, Nortel SNAS 4050 devices in a cluster can 
control more switches and handle more user sessions.