Cisco Cisco Expressway 维护手册
Field
Description
Usage tips
Authentication
mode
mode
Enables or disables SNMPv3 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.
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.
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.
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.
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.
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 DNS page, System > DNS):
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):
■
if there are no DNS servers configured, you must use an IP address for the NTP server
■
if there are one or more DNS servers configured, you can use an FQDN or IP address for the NTP server
■
if there is a DNS Domain name configured in addition to one or more DNS servers, you can use the server
name, FQDN or IP address for the NTP server
name, FQDN or IP address for the NTP server
Three of the Address fields default to NTP servers provided by Cisco.
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Cisco Expressway Administrator Guide