Cisco Cisco Expressway Maintenance Manual
Field
Description
Usage tips
Authentication
mode
mode
Enables or disables SNMPv3
authentication.
authentication.
Type
The algorithm used to hash authentication
credentials.
credentials.
SHA: Secure Hash Algorithm.
MD5: Message-Digest algorithm 5.
The default is SHA.
Password
The password used to encrypt
authentication credentials.
authentication credentials.
Must be at least 8 characters.
v3 Privacy
settings (only applicable to SNMPv3)
Privacy mode
Enables or disables SNMPv3 encryption.
Type
The security model used to encrypt
messages.
messages.
DES: Data Encryption Standard 56-bit
encryption.
encryption.
AES: Advanced Encryption Standard 128-
bit encryption.
bit encryption.
If available, the default and recommended
setting is AES.
setting is AES.
Password
The password used to encrypt messages.
Must be at least 8 characters.
The Expressway does not support SNMP traps or SNMP sets, therefore it cannot be managed via SNMP.
Note: SNMP is disabled by default, because of the potentially sensitive nature of the information involved.
Do not enable SNMP on a Expressway on the public internet or in any other environment where you do not
want to expose internal system information.
Do not enable SNMP on a Expressway on the public internet or in any other environment where you do not
want to expose internal system information.
Configuring time settings
The
Time
page (
System > Time
) is used to configure the Expressway's NTP servers and to specify the
local time zone.
An NTP server is a remote server with which the Expressway synchronizes in order to ensure its time is
accurate. The NTP server provides the Expressway with UTC time.
accurate. The NTP server provides the Expressway with UTC time.
Accurate time is necessary for correct system operation.
Configuring the NTP servers
To configure the Expressway with one or more NTP servers to be used when synchronizing system time,
enter the Address of up to five servers in one of the following formats, depending on the system's DNS
settings (you can check these settings on the
enter the Address of up to five servers in one of the following formats, depending on the system's DNS
settings (you can check these settings on the
DNS
page,
System > DNS
):
n
if there are no DNS servers configured, you must use an IP address for the NTP server
n
if there are one or more DNS servers configured, you can use an FQDN or IP address for the NTP server
Cisco Expressway Administrator Guide (X8.5.2)
Page 40 of 403
Network and system settings
Network services