IP Addressing Commands

IP Addressing Commands
• ip address, page 2
• ip address dhcp, page 3
• switch renew dhcp, page 4
• ip default-gateway, page 5
• show switch ip interface, page 6
• arp, page 7
• arp timeout, page 8
• switch clear arp-cache, page 9
• show switch arp table, page 10
Cisco Enterprise Network Compute System Switch Command Reference
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IP Addressing Commands
ip address
ip address
To define an IP address for an interface, use the ip address command in interface switch configuration mode.
Use the no form of this command to remove an IP address definition.
ip address ip-address mask
no ip address
Syntax Description
ip-address
Specifies the IP address.
mask
Specifies the network mask of the IP address.
Command Default
No IP address is defined for interfaces.
Command Modes
Interface (VLAN) switch configuration (config-switch-if)
Command History
Usage Guidelines
Release
Modification
3.5.1
This command was introduced.
Use the ip address command to define a static IP address on an interface.
Defining a static IP address on an interface stops the DHCP client running on the interface and removes the
IP address assigned by the DHCP client.
There is no default IP address assigned to default VLAN.
Examples
The following example configures VLAN 20 with the IP address 209.165.201.2 and the subnet mask
255.255.255.0.
nfvis(config)# switch
nfvis(config-switch)# interface vlan 20
nfvis(config-switch-if)# ip address 209.165.201.2 255.255.255.0
nfvis(config-switch-if)# commit
nfvis(config-switch-if)# end
Cisco Enterprise Network Compute System Switch Command Reference
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IP Addressing Commands
ip address dhcp
ip address dhcp
To acquire the IP address for an Ethernet interface from the Dynamic Host Configuration Protocol (DHCP)
server, use the ip address dhcp command in interface configuration mode. To release the acquired IP address,
use the no form of this command.
ip address dhcp
no ip address dhcp
Syntax Description
This command has no arguments or keywords.
Command Default
None
Command Modes
Interface (VLAN) switch configuration (config-switch-if)
Command History
Release
Modification
3.7.1
This command was introduced.
Usage Guidelines
This command enables the DHCP client on the interface and removes all manually-configured addresses on
the interface. The no form of this command disables the DHCP client on the interface. The default route
(Default Gateway) received in DHCP Router option (Option 3) is assigned a metric of 8.
Examples
The following example acquires an IP address for VLAN 100 from DHCP.
nfvis(config-switch)# interface vlan 100
nfvis(config-switch-if)# ip address dhcp
nfvis(config-switch-if)# commit
nfvis(config-switch-if)# end
Cisco Enterprise Network Compute System Switch Command Reference
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IP Addressing Commands
switch renew dhcp
switch renew dhcp
To renew the IP address that was acquired from a DHCP server for a specific interface, use the switch renew
dhcp command in privileged EXEC mode.
switch renew dhcp vlan vlan-id
Syntax Description
vlan vlan-id
Command Default
None
Command Modes
Privileged EXEC (#)
Command History
Specifies the VLAN ID.
Release
Modification
3.7.1
This command was introduced.
Usage Guidelines
This command does not enable the DHCP client on an interface. If the DHCP client is not enabled on the
specified interface, this command returns an error message. To enable the DHCP client on an interface, use
the ip address dhcp command.
Examples
The following example renews an IP address on VLAN 19 that was acquired from a DHCP server:
nfvis# switch renew dhcp vlan 19
Cisco Enterprise Network Compute System Switch Command Reference
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IP Addressing Commands
ip default-gateway
ip default-gateway
To define a default gateway (device), use the ip default-gateway command in switch configuration mode.
To delete the default gateway, use the no form of this command.
ip default-gateway ip-address
no ip default-gateway
Syntax Description
ip-address
Specifies the IP address for the default gateway.
Command Default
No default gateway is defined.
Command Modes
Switch configuration (config-switch)
Command History
Release
Modification
3.5.1
This command was introduced.
Usage Guidelines
None
Examples
The following example defines the default gateway 209.165.201.1.
nfvis(config-switch)# ip default-gateway 209.165.201.1
nfvis(config-switch)# commit
nfvis(config-switch)# end
Cisco Enterprise Network Compute System Switch Command Reference
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IP Addressing Commands
show switch ip interface
show switch ip interface
To display the usability status of configured IP interfaces, use the show switch ip interface command in
privileged EXEC mode.
show switch ip interface
Syntax Description
This command has no arguments.
Command Default
None
Command Modes
Privileged EXEC (#)
Command History
Examples
Release
Modification
3.6.1
This command was introduced.
The following is a sample output of the show switch ip interface command:
nfvis# show switch ip interface
IF
ADMIN
OPER
IP ADDRESS
NAME
STATUS STATUS TYPE
---------------------------------------------172.25.213.10 VLAN2 Up
Up
Static
Cisco Enterprise Network Compute System Switch Command Reference
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IP Addressing Commands
arp
arp
To add a permanent entry to the Address Resolution Protocol (ARP) cache, use the arp command in switch
configuration mode. To remove an entry from the ARP cache, use the no form of this command.
arp ip-address vlan vlan-id mac-address
no arp ip-address
Syntax Description
ip-address
Specifies the IP address or IP alias to map to the specified MAC address.
vlan vlan-id
Specifies the VLAN ID. You can enter a value from one of the following
ranges:
• 1 to 2349
• 2450 to 4093
mac-address
Specifies the MAC address to map to the specified IP address or IP alias.
Command Default
None
Command Modes
Switch configuration (config-switch)
Command History
Release
Modification
3.6.1
This command was introduced.
Usage Guidelines
The software uses ARP cache entries to translate 32-bit IP addresses into 48-bit hardware (MAC) addresses.
Because most hosts support dynamic address resolution, static ARP cache entries generally do not need to be
specified.
Examples
The following example adds IP address 198.133.219.232 and MAC address 00:00:0c:40:0f:bc to the ARP
table:
nfvis(config-switch)# arp 198.133.219.232 vlan 100 00:00:0c:40:0f:bc
nfvis(config-switch)# commit
nfvis(config-switch)# end
Cisco Enterprise Network Compute System Switch Command Reference
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IP Addressing Commands
arp timeout
arp timeout
To set the time interval during which an entry remains in the ARP cache, use the arp timeout command in
switch configuration mode. To restore the default configuration, use the no form of this command.
arp timeout seconds
no arp timeout
Syntax Description
seconds
Specifies the time interval (in seconds) during which an entry remains in the ARP
cache. Valid range is from 1to 40000000.
Command Default
The default ARP timeout is 60000 seconds, if IP Routing is enabled, and 300 seconds if IP Routing is disabled.
Command Modes
Switch configuration (config-switch)
Command History
Release
Modification
3.6.1
This command was introduced.
Usage Guidelines
None
Examples
The following example configures the ARP timeout to 12000 seconds:
nfvis(config-switch)# arp timeout 12000
nfvis(config-switch)# commit
nfvis(config-switch)# end
Cisco Enterprise Network Compute System Switch Command Reference
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IP Addressing Commands
switch clear arp-cache
switch clear arp-cache
To delete all dynamic entries from the ARP cache, use the switch clear arp-cache command in privileged
EXEC mode.
switch clear arp-cache
Syntax Description
This command has no arguments.
Command Default
None
Command Modes
Privileged EXEC (#).
Command History
Examples
Release
Modification
3.5.1
This command was introduced.
The following example deletes all dynamic entries from the ARP cache:
nfvis# switch clear arp-cache
Cisco Enterprise Network Compute System Switch Command Reference
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IP Addressing Commands
show switch arp table
show switch arp table
To display entries in the Address Resolution Protocol (ARP) table, use the show switch arp table command
in privileged EXEC mode.
show switch arp table
Syntax Description
This command does not have any arguments.
Command Default
None
Command Modes
Privileged EXEC (#)
Command History
Examples
Release
Modification
3.5.1
This command was introduced.
The following is a sample output of the show switch arp table command:
nfvis# show switch arp table
IP ADDR
VLAN
INTERFACE HW ADDRESS
STATUS
-------------------------------------------------------------192.0.2.4 VLAN2363 te1/2
00:50:22:00:2A:A4 dynamic
192.0.2.5 VLAN2364 te1/0
00:a6:ca:d6:30:c3 dynamic
192.0.2.6 VLAN2365 te1/1
00:50:22:00:2A:A5 dynamic
Cisco Enterprise Network Compute System Switch Command Reference
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