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To configure a name for a PNNI node, use the name node-level subcommand. To return to the default value, use the no form of this command.
Syntax Description
| name | Specify the ASCII name for the PNNI node. |
Default
The value assigned by the hostname command.
Command Mode
PNNI node command.
Usage Guidelines
The LightStream 1010 PNNI node name is distributed to all other nodes via PNNI flooding. This allows all LightStream 1010 PNNI nodes to use this node name to identify this node in the following PNNI show commands:
This command only applies to PNNI nodes.
For more information, refer to the LightStream 1010 ATM Switch Software Configuration Guide.
Example
The following example configures the node name to be eng_1.
Switch# configure terminal Switch(config)# atm router pnni Switch(config-atm-router)# node 1 Switch(config-pnni-node)# name eng_1 Switch(config-pnni-node)#
Related Commands
To name an existing network connection, use the name-connection EXEC command.
Syntax Description
| name | A name that identifies the internal adapter. |
Command Mode
EXEC.
Usage Guidelines
The name can be any string of up to 8 characters that does not include blanks.
Example
The following example assigns a name to an internal adapter interface.
Switch# name VTAM_B14
Use the interface atm command with global configuration commands. Allows the recovered clock to specify a particular port to provide network clocking. Use the no form of this command to disable this feature.
Syntax Description
| card/sub/card/port | Card, subcard, and port number for the SONET port. |
| priority | Specifies the priority between 1 and 4. |
Default
No network-clocks.
Command Mode
Global configuration.
Usage Guidelines
This command applies only to SONET interfaces.
Sample Display
The following example shows how to configure ATM 3/0/1 as a network clock source of priority 2 and to configure ATM 0/1/0 to use network-clock mode.
Switch# configure terminal Switch(config)# network 2 atm 3/0/1 Switch(config)# interface atm 0/1/0 Switch(config)# clock network-derived end
Related Commands
clock source
To create, delete, enable, or disable nodes running on this switch and to specify or change the level of a node, use the node ATM router PNNI configuration command. PNNI node configuration mode is started when this command is entered. To remove a previously set node index, use the no form of this command.
Syntax Description
Default
With LightStream 1010 ATM switch's autoconfiguration capabilities, a lowest-level PNNI node, with the node index 1, is automatically created and by default runs on all PNNI interfaces (including interfaces determined by ILMI to be PNNI interfaces and on interfaces configured to run PNNI).
The default level is 56, the proper level for lowest-level nodes using autoconfigured Cisco ATM addresses in a single level hierarchy.
Command Mode
ATM router PNNI configuration.
Usage Guidelines
Currently only a single lowest-level node with node index 1 is supported.
Only a node running at the lowest level can be configured to run on an interface.
The level of a node can only be modified when the node is disabled.
Enable and disable can be used to reinitialize PNNI. For example, the node ID and peer group ID are recalculated based on the switch's first ATM address and the node-level whenever a node is enabled.
For more information, refer to the LightStream 1010 ATM Switch Software Configuration Guide.
Example
The following example shows how to enter PNNI node configuration mode.
The following example shows how to create a lowest-level PNNI node with node index 1 at level 96 (assuming no node currently exists on this switch).
Related Commands
atm address
To enable terminal notification about pending output from other connections, use the notify line configuration command. The no form of this command ends notification.
Syntax Description
This command has no arguments or keywords.
Default
Disabled.
Command Mode
Line configuration.
Usage Guidelines
The command sets a line to inform a user with multiple, concurrent Telnet connections when output is pending on a connection other than the current one.
Example
The following example sets up notification of pending output from connections on virtual terminal lines 0 to 4.
Related Command
terminal notify
To control access to the system's Network Time Protocol (NTP) services, use the ntp access-group global configuration command. To remove access control to the system's NTP services, use the no form of this command.
Syntax Description
Default
No access control (full access granted to all systems).
Command Mode
Global configuration.
Usage Guidelines
The ntp-access group command scans the options in the following order from least restrictive to most restrictive:
Access is granted for the first match found. If no access groups are specified, complete access is granted to all sources. If any access groups are specified, only the specified access is granted. This facility provides minimal security. If more security is desired, use the NTP authentication facility.
Example
In the following example, the system is configured to allow itself to be synchronized by a peer from access list 99. However, the system restricts access to allow only time requests from access list 42.
Related Command
access-list
To enable Network Time Protocol (NTP) authentication, use the ntp authenticate global configuration command. Use the no form of this command to disable the feature.
Syntax Description
This command has no keywords or arguments.
Default
No authentication.
Command Mode
Global configuration.
Usage Guidelines
Use this command if you want authentication. If this command is specified, the system does not synchronize to a system unless it carries one of the authentication keys specified in the ntp trusted-key command.
Example
The following example enables NTP authentication.
Related Commands
ntp authentication-key
To define an authentication key for Network Time Protocol (NTP), use the ntp authentication-key global configuration command. Use the no form of this command to remove the authentication key for NTP.
Syntax Description
Default
No authentication key is defined for NTP.
Command Mode
Global configuration.
Usage Guidelines
Use this command to define authentication keys for use with other NTP commands to provide a higher degree of security.
Example
The following example sets authentication key 10 to aNiceKey.
Related Commands
ntp authentication-key
To specify that a specific interface should send Network Time Protocol (NTP) broadcast packets, use the ntp broadcast interface configuration command. Use the no form of this command to disable this capability.
Syntax Description
Default
Disabled.
Command Mode
Interface configuration.
Example
In the following example, Ethernet interface 2/0/0 is configured to send NTP version 2 packets.
Related Commands
ntp broadcast client
To allow the system to receive NTP broadcast packets on an interface, use the ntp broadcast client interface configuration command. Use the no form of this command to disable this capability.
Syntax Description
This command has no arguments or keywords.
Default
Disabled.
Command Mode
Interface configuration.
Usage Guidelines
Use this command to allow the system to listen to broadcast packets on an interface-by-interface basis.
Example
In the following example, the switch synchronizes to NTP packets broadcast on Ethernet interface 2/0/0.
Related Commands
ntp broadcast
To set the estimated round-trip delay between the switch and a Network Time Protocol (NTP) broadcast server, use the ntp broadcastdelay global configuration command. Use the no form of this command to revert to the default value.
Syntax Description
Default
3000 microseconds.
Command Mode
Global configuration.
Usage Guidelines
Use this command when the switch is configured as a broadcast client and the round-trip delay on the network is other than 3000 microseconds.
Example
In the following example, the estimated round-trip delay between the switch and the broadcast client is set to 5000 microseconds.
Related Commands
ntp broadcast
As NTP compensates for the error in the system clock, it keeps track of the correction factor for this error. The system automatically saves this value into the system configuration using the ntp clock-period global configuration command. The system uses the no form of this command to revert to the default.
Syntax Description
Default
17179869 (4 milliseconds).
Command Mode
Global configuration.
Usage Guidelines
If a copy running-config startup-config command is entered to save the configuration to memory, this command is automatically added to the configuration. It is a good idea to perform this task after NTP has been running for a week or so; this helps NTP synchronize more quickly if the system is restarted.
To prevent an interface from receiving Network Time Protocol (NTP) packets, use the ntp disable interface configuration command. To enable receipt of NTP packets on an interface, use the no form of this command.
Syntax Description
This command has no arguments or keywords.
Default
Disabled.
Command Mode
Interface configuration.
Usage Guidelines
This command provides a simple method of access control.
Example
In the following example, Ethernet interface 2/0/0 is prevented from receiving NTP packets.
To configure the switch as a Network Time Protocol (NTP) master clock to which peers synchronize themselves when an external NTP source is not available, use the ntp master global configuration command. To disable the master clock function, use the no form of this command.
Syntax Description
Default
By default, the master clock function is disabled. When enabled, the default stratum is 8.
Command Mode
Global configuration.
Usage Guidelines
Since the Cisco implementation of NTP does not support directly attached radio or atomic clocks, the switch is normally synchronized, directly or indirectly, to an external system that has such a clock. In a network without Internet connectivity, such a time source may not be available. The ntp master command is used in such cases.
If the system has ntp master configured and it cannot reach any clock with a lower stratum number, the system claims to be synchronized at the configured stratum number, and other systems synchronize to it via NTP.
Example
In the following example, the switch is configured as an NTP master clock to which peers may synchronize.
Related Command
clock calendar-valid
To configure the switch's system clock to synchronize a peer or to be synchronized by a peer, use the
Syntax Description
Default
No peers are configured by default. If a peer is configured, the default NTP version number is 3, no authentication key is used, and the source IP address is taken from the outgoing interface.
Command Mode
Global configuration.
Usage Guidelines
Use this command if you want to allow this machine to synchronize with the peer or vice versa. Using the prefer keyword reduces switching back and forth between peers.
If you are using the default version of 3 and NTP synchronization does not occur, try using NTP version number 2. Many NTP servers on the Internet run version 2.
Example
In the following example, the switch is configured to allow its system clock to be synchronized with the clock of the peer (or vice versa) at IP address 131.108.22.33 using NTP version 2. The source IP address is the address of Ethernet 2/0/0.
Related Commands
ntp authentication-key
To allow the switch's system clock to be synchronized by a time server, use the ntp server global configuration command. To disable this capability, use the no form of this command.
Syntax Description
Default
No peers are configured by default. If a peer is configured, the default NTP version number is 3, no authentication key is used, and the source IP address is taken from the outgoing interface.
Command Mode
Global configuration.
Usage Guidelines
Use this command if you want to allow this machine to synchronize with the specified server. The server does not synchronize to this machine.
Using the prefer keyword reduces switching back and forth between servers.
If you are using the default version of 3 and NTP synchronization does not occur, try using NTP version number 2. Many NTP servers on the Internet run version 2.
Example
In the following example, the switch is configured to allow its system clock to be synchronized with the clock of the peer at IP address 128.108.22.44 using NTP version 2.
Related Commands
ntp authentication-key
To use a particular source address in Network Time Protocol (NTP) packets, use the ntp source global configuration command. Use the no form of this command to remove the specified source address.
Syntax Description
Default
Source address is determined by the outgoing interface.
Command Mode
Global configuration.
Usage Guidelines
Use this command when you want to use a particular source IP address for all NTP packets. The address is taken from the named interface. This command is useful if the address on an interface cannot be used as the destination for reply packets. If the source keyword is present on an ntp server or ntp peer command, that value overrides the global value.
Example
In the following example, the switch is configured to use the IP address of Ethernet 2/0/0 as the source address of all outgoing NTP packets.
Related Commands
If you want to authenticate the identity of a system to which Network Time Protocol (NTP) synchronizes, use the ntp trusted-key global configuration command. Use the no form of this command to disable authentication of the identity of the system.
Syntax Description
Default
Disabled.
Command Mode
Global configuration.
Usage Guidelines
If authentication is enabled, use this command to define one or more key numbers (corresponding to the keys defined with the ntp authentication-key command) that a peer NTP system must provide in its NTP packets in order for this system to synchronize to it. This provides protection against accidentally synchronizing the system to a system that is not trusted because the other system must know the correct authentication key.
Example
In the following example, the system is configured to synchronize only to systems providing authentication key 42 in its NTP packets.
Related Command
To periodically update the calendar from Network Time Protocol (NTP), use the ntp update-calendar global configuration command. Use the no form of this command to disable this feature.
Syntax Description
This command has no arguments or keywords.
Default
The calendar is not updated.
Command Mode
Global configuration.
Usage Guidelines
If a switch is synchronized to an outside time source via NTP, you should periodically update the calendar with the time learned from NTP. Otherwise, the calendar tends to gradually lose or gain time. The calendar is updated only if NTP has synchronized to an authoritative time server.
Example
In the following example, the system is configured to periodically update the calendar from the system clock.
Related Commands
clock read-calendar
Copyright 1988-1996 © Cisco Systems Inc.
show network-clocks
no node node_index
node_index
Specifies the local node index used to identify nodes running on this switch.
level_indicator
Specifies the PNNI level (position in the PNNI hierarchy) at which the node exists.
lowest
Indicates that the node to be created is a lowest-level node (for example, the node runs over physical links and VPCs). If this is not present when a new node_index is specified, the new node becomes a logical group node that represents a PNNI peer group. A logical group node only becomes active when its child node is elected peer group leader.
Switch# configure terminal
Switch(config)# atm router pnni
Switch(config-atm-router)# node 1
Switch(config-pnni-node)#
Switch# configure terminal
Switch(config)# atm router pnni
Switch(config-atm-router)# node 1 level 96 lowest
Switch(config-pnni-node)#
atm router pnni
show atm pnni node
no notify
Switch# line vty 0 4
Switch(config-line)# notify
no ntp access-group {query-only | serve-only | serve | peer}
query-only
Allows only NTP control queries. See RFC 1305 (NTP version 3).
serve-only
Allows only time requests.
serve
Allows time requests and NTP control queries, but does not allow the system to synchronize to the remote system.
peer
Allows time requests and NTP control queries and allows the system to synchronize to the remote system.
access-list-number
Number (1 to 99) of a standard IP access list.
Switch# ntp access-group peer 99
Switch# ntp access-group serve-only 42
no ntp authenticate
Switch# ntp authenticate
ntp trusted-key
no ntp authentication-key number
number
Key number (1 to 4294967295).
md5
Authentication key. Message authentication support is provided using the Message Digest (MD5) algorithm. The key type md5 is currently the only key type supported.
value
Key value (an arbitrary string of up to eight characters).
Switch# ntp authentication-key 10 md5 aNiceKey
ntp peer
ntp server
ntp trusted-key
no ntp broadcast
version number
(Optional) Number from 1 to 3 indicating the NTP version.
Switch(config)# interface ethernet 2/0/0
Switch(config-if)# ntp broadcast version 2
ntp broadcastdelay
no ntp broadcast client
Switch(config)# interface ethernet 2/0/0
Switch(config-if)# ntp broadcast client
ntp broadcastdelay
no ntp broadcastdelay
microseconds
Estimated round-trip time (in microseconds) for NTP broadcasts. The range is from 1 to 999999.
Switch# ntp broadcastdelay 5000
ntp broadcast client
no ntp clock-period
value
Amount to add to the system clock for each clock hardware tick (in units of 2 to 32 seconds).
no ntp disable
Switch(config)# interface ethernet 2/0/0
Switch(config-if)# ntp disable
no ntp master [stratum]
stratum
(Optional) Number from 1 to 15. Indicates the NTP stratum number that the system claims.
Switch# ntp master 10
ntp peer global configuration command. To disable this capability, use the no form of this command.
no ntp peer ip-address
ip-address
IP address of the peer providing or being provided the clock synchronization.
version
(Optional) Defines the Network Time Protocol (NTP) version number.
number
(Optional) NTP version number (1 to 3).
key
(Optional) Defines the authentication key.
keyid
(Optional) Authentication key to use when sending packets to this peer.
source
(Optional) Names the interface.
interface
(Optional) Name of the interface from which to pick the IP source address.
prefer
(Optional) Makes this peer the preferred peer that provides synchronization.
Switch# ntp peer 131.108.22.33 version 2 source ethernet 2/0/0
ntp server
ntp source
no ntp server ip-address
ip-address
IP address of the time server providing the clock synchronization.
version
(Optional) Defines the Network Time Protocol (NTP) version number.
number
(Optional) NTP version number (1 to 3).
key
(Optional) Defines the authentication key.
keyid
(Optional) Authentication key to use when sending packets to this peer.
source
(Optional) Identifies the interface from which to pick the IP source address.
interface
(Optional) Name of the interface from which to pick the IP source address.
prefer
(Optional) Makes this server the preferred server that provides synchronization.
Switch# ntp server 128.108.22.44 version 2
ntp peer
ntp source
no ntp source
interface
Any valid system interface name.
Switch# ntp source ethernet 2/0/0
no ntp trusted-key key-number
key-number
Key number of authentication key to be trusted.
Switch# ntp authenticate
Switch# ntp authentication-key 42 md5 aNiceKey
Switch# ntp trusted-key 42
no ntp update-calendar
Switch# ntp update-calendar
clock update-calendar
