Reference Guide

Version 8.3.12.0 Added support for the -c and -m parameters on the S4810.
Version 8.3.7.0 Introduced on the S4810.
Version 7.6.1.0 Introduced on the S-Series.
Version 7.5.1.0 Added IPv6 support. Introduced on the C-Series.
pre-Version
6.1.1.0
Introduced on the E-Series.
Usage
Information
FTOS supports both inbound and outbound SSH sessions using IPv4 or IPv6 addressing.
Inbound SSH supports accessing the system through the management interface as well as
through a physical Layer 3 interface.
Example
FTOS#ssh 10.11.8.12 ?
-c Encryption cipher to use (for v2 clients only)
-l User name option
-m HMAC algorithm to use (for v2 clients only)
-p SSH server port option (default 22)
-v SSH protocol version
<cr>
FTOS#ssh 10.11.8.12 -c ?
3des-cbc Force ssh to use 3des-cbc encryption cipher
FTOS#ssh 10.11.8.12 -m ?
hmac-sha1 Force ssh to use hmac-sha1 HMAC algorithm
hmac-sha1-96 Force ssh to use hmac-sha1-96 HMAC algorithm
hmac-md5 Force ssh to use hmac-md5 HMAC algorithm
hmac-md5-96 Force ssh to use hmac-md5-96 HMAC algorithm
Secure DHCP Commands
DHCP as defined by RFC 2131 provides no authentication or security mechanisms. Secure DHCP is a suite of features
that protects networks that use dynamic address allocation from spoofing and attacks.
ip dhcp relay
Enable Option 82.
S4820T
Syntax
ip dhcp relay information-option [trust-downstream]
Parameters
trust-downstream Configure the system to trust Option 82 when it is received from the
previous-hop router.
Defaults Disabled.
Command Modes CONFIGURATION
Command History
This guide is platform-specific. For command information about other platforms, refer to the
relevant FTOS Command Line Reference Guide .
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