Cisco Nexus 5000 Series NX-OS Unicast Routing Command

Cisco Nexus 5000 Series NX-OS Unicast Routing Command
Se n d c o m m e n t s t o n ex u s 5 k - d o c f e e d b a ck @ c i s c o . c o m
I Commands
This chapter describes the Cisco NX-OS Open Shortest Path First (OSPF) commands that begin with I.
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I Commands
ip ospf authentication
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ip ospf authentication
To specify the authentication type for an Open Shortest Path First (OSPF) interface, use the ip ospf
authentication command. To remove the authentication type for an interface, use the no form of this
command.
ip ospf authentication [key-chain key-name | message-digest | null]
no ip ospf authentication
Syntax Description
Command Default
key-chain key-name
(Optional) Specifies a key chain to use for authentication. The
key-name argument can be a maximum of 63 alphanumeric
characters.
message-digest
(Optional) Specifies that message-digest authentication is used.
null
(Optional) Specifies that no authentication is used. Use this keyword
to override any other authentication configured for an area.
No authentication
Command Modes
Usage Guidelines
Release
Modification
5.0(3)N1(1)
This command was introduced.
Use the ip ospf authentication command to configure the authentication mode for an OSPF interface.
If you use this command with no keywords, use the ip ospf authentication-key command to configure
the password. If you use the message-digest keyword, use the ip ospf message-digest-key command to
configure the message-digest key for the interface.
The authentication that you configure on an interface overrides the authentication that you configure for
the area.
This command requires the LAN Base Services license.
Examples
This example shows how to configure message-digest authentication:
switch(config)# interface ethernet 2/1
switch(config-if)# no switchport
switch(config-if)# ip ospf authentication message-digest
switch(config-if)# ip ospf message-digest-key 33 md5 0 mypassword
switch(config-if)#
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I Commands
ip ospf authentication
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Related Commands
Command
Description
area authentication
Enables authentication for an OSPF area.
copy running-config
startup-config
Saves the configuration changes to the startup configuration file.
ip ospf
authentication-key
Assigns a password to be used by neighboring routers that are using the
password authentication of OSPF.
ip ospf
message-digest-key
Configures the OSPF MD5 message-digest key.
show ip ospf
Displays OSPF information.
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I Commands
ip ospf authentication-key
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ip ospf authentication-key
To assign a password for simple password authentication to be used by neighboring Open Shortest Path
First (OSPF) routers, use the ip ospf authentication-key command. To remove a previously assigned
OSPF password, use the no form of this command.
ip ospf authentication-key [0 | 3 | 7] password
no ip ospf authentication-key
Syntax Description
Command Default
0
(Optional) Configures an unencrypted password.
3
(Optional) Configures a 3DES encrypted password string.
7
(Optional) Configures a Cisco type 7 encrypted password string.
password
Any continuous string of characters that can be entered from the
keyboard up to 8 bytes.
Unencrypted password
Command Modes
Usage Guidelines
Note
Release
Modification
5.0(3)N1(1)
This command was introduced.
Use the ip ospf authentication-key command to configure a password for simple password
authentication. The password created by this command is used as a key that is inserted directly into the
OSPF header when Cisco NX-OS originates routing protocol packets. You can assign a separate
password to each network on a per-interface basis. All neighboring routers on the same network must
have the same password to be able to exchange OSPF information.
Cisco NX-OS uses this key when you enable authentication for an interface with the ip ospf
authentication interface configuration command or if you configure the area for authentication with the
area authentication command in router configuration mode.
This command requires the LAN Base Services license.
Examples
This example shows how to configure an unencrypted authentication key with the string yourpass:
switch(config)# interface ethernet 1/5
switch(config-if)# no switchport
switch(config-if)# ip ospf authentication-key yourpass
switch(config-if)#
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I Commands
ip ospf authentication-key
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Related Commands
Command
Description
area authentication
Specifies the authentication type for an OSPF area.
copy running-config
startup-config
Saves the configuration changes to the startup configuration file.
ip ospf authentication Specifies the authentication type for an interface.
show ip ospf interface Displays OSPF information.
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I Commands
ip ospf cost
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ip ospf cost
To specify the cost of sending a packet on an interface, use the ip ospf cost command. To reset the path
cost to the default, use the no form of this command.
ip ospf cost interface-cost
no ip ospf cost interface-cost
Syntax Description
interface-cost
Command Default
Calculates the cost based on the reference bandwidth divided by the configured interface bandwidth. You
can configure the reference bandwidth or it defaults to 40 Gb/s.
Unsigned integer value expressed as the link-state metric. The range
is from 1 to 65535.
Command Modes
Usage Guidelines
Release
Modification
5.0(3)N1(1)
This command was introduced.
Use the ip ospf cost command to configure the cost metric manually for each interface. This command
overrides any settings for the reference bandwidth that you set using the reference-bandwidth
command in router configuration mode.
If this command is not used, the link cost is calculated using the following formula:
link cost = reference bandwidth / interface bandwidth
This command requires the LAN Base Services license.
Examples
This example shows how to configure the interface cost value to 65:
switch(config)# interface ethernet 1/2
switch(config-if)# no switchport
switch(config-if)# ip ospf cost 65
switch(config-if)#
Related Commands
Command
Description
reference-bandwidth
Specifies the reference bandwidth that OSPF uses to calculate the link cost.
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I Commands
ip ospf dead-interval
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ip ospf dead-interval
To set the interval during which at least one hello packet must be received from a neighbor before the
router declares that neighbor as down, use the ip ospf dead-interval command. To restore the default,
use the no form of this command.
ip ospf dead-interval seconds
no ip ospf dead-interval
Syntax Description
seconds
Command Default
The default for seconds is four times the interval set by the ip ospf hello-interval command.
Interval (in seconds) during which the router must receive at least one hello
packet from a neighbor or that neighbor adjacency is removed from the local
router and does not participate in routing. The range is from 1 to 65535, and
the default is 40. The value must be the same for all nodes on the network.
Command Modes
Usage Guidelines
Release
Modification
5.0(3)N1(1)
This command was introduced.
Use the ip ospf dead-interval command to set the dead interval that Open Shortest Path First (OSPF)
advertises in hello packets. This value must be the same for all networking devices on a specific network.
Configure a shorter dead interval to detect down neighbors faster and improve convergence. Very short
dead intervals could cause routing instability.
Use the show ip ospf interface command to verify the dead interval and hello interval.
This command requires the LAN Base Services license.
Examples
This example shows how to set the OSPF dead interval to 20 seconds:
switch(config)# interface ethernet 1/2
switch(config-if)# no switchport
switch(config-if)# ip ospf dead-interval 20
switch(config-if)#
Related Commands
Command
Description
ip ospf hello-interval
Specifies the interval between hello packets that OSPF sends on the
interface.
show ip ospf interface
Displays OSPF interface-related information.
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I Commands
ip ospf hello-interval
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ip ospf hello-interval
To specify the interval between hello packets that Open Shortest Path First (OSPF) sends on the
interface, use the ip ospf hello-interval command. To return to the default, use the no form of this
command.
ip ospf hello-interval seconds
no ip ospf hello-interval
Syntax Description
seconds
Command Default
10 seconds
Interval (in seconds). The value must be the same for all nodes on a
specific network. The range is from 1 to 65535.
Command Modes
Usage Guidelines
Release
Modification
5.0(3)N1(1)
This command was introduced.
Use the ip ospf hello-interval command to set the rate at which OSPF advertises hello packets. Shorter
hello intervals allow OSPF to detect topological changes faster. This value must be the same for all
routers and access servers on a specific network.
This command requires the LAN Base Services license.
Examples
This example shows how to set the interval between hello packets to 15 seconds:
switch(config)# interface ethernet 1/2
switch(config-if)# no switchport
switch(config-if)# ip ospf hello-interval 15
switch(config-if)#
Related Commands
Command
Description
copy running-config
startup-config
Saves the configuration changes to the startup configuration file.
ip ospf dead-interval
Sets the time period for which hello packets must not have been seen before
neighbors declare the router as down.
show ip ospf
Displays OSPF information.
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I Commands
ip ospf message-digest-key
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ip ospf message-digest-key
To enable Open Shortest Path First (OSPF) Message Digest 5 (MD5) authentication, use the ip ospf
message-digest-key command. To remove an old MD5 key, use the no form of this command.
ip ospf message-digest-key key-id md5 [0 | 3 | 7] key
no ip ospf message-digest-key key-id
Syntax Description
Command Default
key-id
Identifier in the range from 1 to 255.
0
(Optional) Specifies an unencrypted password to generate the MD5
key.
3
(Optional) Specifies an encrypted 3DES password to generate the
md5 key.
7
(Optional) Specifies a Cisco type 7 encrypted password to generate
the MD5 key.
key
Alphanumeric password of up to 16 bytes.
Unencrypted
Command Modes
Usage Guidelines
Release
Modification
5.0(3)N1(1)
This command was introduced.
Use the ip ospf message-digest-key command when you configure the MD5 digest authentication mode.
All neighbor routers must have the same key value on the network.
This command requires the LAN Base Services license.
Examples
This example shows how to set key 19 with the password 8ry4222:
switch# configure terminal
switch(config)# interface ethernet 1/2
switch(config-if)# no switchport
switch(config-if)# ip ospf message-digest-key 19 md5 8ry4222
switch(config-if)#
Related Commands
Command
Description
area authentication
Enables authentication for an OSPF area.
copy running-config
startup-config
Saves the configuration changes to the startup configuration file.
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I Commands
ip ospf message-digest-key
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Command
Description
ip ospf authentication
Specifies the authentication type for an interface.
show ip ospf
Displays OSPF information.
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I Commands
ip ospf mtu-ignore
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ip ospf mtu-ignore
To disable Open Shortest Path First (OSPF) maximum transmission unit (MTU) mismatch detection on
received Database Descriptor (DBD) packets, use the ip ospf mtu-ignore command. To return to the
default, use the no form of this command.
ip ospf mtu-ignore
no ip ospf mtu-ignore
Syntax Description
This command has no arguments or keywords.
Command Default
OSPF MTU mismatch detection is enabled.
Command Modes
Usage Guidelines
Release
Modification
5.0(3)N1(1)
This command was introduced.
Use the ip ospf mtu-ignore command to disable MTU mismatch detection on an interface. By default,
OSPF checks whether neighbors are using the same MTU on a common interface. If the receiving MTU
is higher than the IP MTU configured on the incoming interface, OSPF does not establish adjacencies.
Use the ip ospf mtu-ignore command to disable this check and allow adjacencies when the MTU value
differs between OSPF neighbors.
This command requires the LAN Base Services license.
Examples
This example shows how to disable MTU mismatch detection on received DBD packets:
switch(config)# interface ethernet 1/2
switch(config-if)# no switchport
switch(config-if)# ip ospf mtu-ignore
switch(config-if)#
Related Commands
Command
Description
show ip ospf
Displays general information about OSPF routing instances.
show ip ospf interface
Displays OSPF-related interface information.
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I Commands
ip ospf network
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ip ospf network
To configure the Open Shortest Path First (OSPF) network type to a type other than the default for an
interface, use the ip ospf network command. To return to the default, use the no form of this command.
ip ospf network {broadcast | point-to-point}
no ip ospf network
Syntax Description
Command Default
broadcast
Sets the network type as broadcast.
point-to-point
Sets the network type as point-to-point.
Depends on the network type.
Command Modes
Usage Guidelines
Release
Modification
5.0(3)N1(1)
This command was introduced.
The network type influences the behavior of the OSPF interface. An OSPF network type is usually
broadcast, which uses OSPF multicasting capabilities. Under this network type, a designated router and
backup designated router are elected. For point-to-point networks, there are only two neighbors and
multicast is not required. For routers on an interface to become neighbors, the network type for all should
match.
This command overrides the medium {broadcast | p2p} command in interface configuration mode.
This command requires the LAN Base Services license.
Examples
This example shows how to set an OSPF network as a broadcast network:
switch(config)# interface ethernet 1/2
switch(config-if)# no switchport
switch(config-if)# ip address 192.0.2.33 255.255.255.0
switch(config-if)# ip ospf network broadcast
switch(config-if)#
Related Commands
Command
Description
show ip ospf
Displays general information about OSPF routing instances.
show ip ospf interface
Displays OSPF-related interface information.
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I Commands
ip ospf passive-interface
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ip ospf passive-interface
To suppress Open Shortest Path First (OSPF) routing updates on an interface, use the ip ospf
passive-interface command. To return to the default, use the no form of this command.
ip ospf passive-interface
no ip ospf passive-interface
Syntax Description
This command has no arguments or keywords.
Command Default
Disabled
Command Modes
Usage Guidelines
Release
Modification
5.0(3)N1(1)
This command was introduced.
If an interface is configured as a passive interface, it does not participate in OSPF and does not establish
adjacencies or send routing updates. However, the interface is announced as part of the routing network.
This command requires the LAN Base Services license.
Examples
This example shows how to set an interface as passive:
switch(config)# interface ethernet 1/2
switch(config-if)# no switchport
switch(config-if)# ip ospf passive-interface
switch(config-if)#
Related Commands
Command
Description
show ip ospf
Displays general information about OSPF routing instances.
show ip ospf interface
Displays OSPF-related interface information.
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I Commands
ip ospf priority
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ip ospf priority
To set the router priority for an Open Shortest Path First (OSPF) interface, use the ip ospf priority
command. To return to the default, use the no form of this command.
ip ospf priority number-value
no ip ospf priority number-value
Syntax Description
number-value
Command Default
Priority of 1
Number that specifies the priority of the router. The range is from 0 to 255.
Command Modes
Usage Guidelines
Release
Modification
5.0(3)N1(1)
This command was introduced.
Use the ip ospf priority command to set the router priority, which determines the designated router for
this network. When two routers are attached to a network, both attempt to become the designated router.
The router with the higher router priority takes precedence. If there is a tie, the router with the higher
router ID takes precedence. A router with a router priority set to zero cannot become the designated
router or backup designated router.
Cisco NX-OS uses this priority value when you configure OSPF for broadcast networks using the
neighbor command in router configuration mode.
This command requires the LAN Base Services license.
Examples
This example shows how to set the router priority value to 4:
switch# configure terminal
switch(config)# interface ethernet 1/2
switch(config-if)# no switchport
switch(config-if)# ip ospf priority 4
switch(config-if)#
Related Commands
Command
Description
ip ospf network
Configures the OSPF network type to a type other than the default for a
given medium.
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I Commands
ip ospf retransmit-interval
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ip ospf retransmit-interval
To specify the time between Open Shortest Path First (OSPF) link-state advertisement (LSA)
retransmissions for adjacencies that belongs to the interface, use the ip ospf retransmit-interval
command. To return to the default, use the no form of this command.
ip ospf retransmit-interval seconds
no ip ospf retransmit-interval
Syntax Description
seconds
Command Default
5 seconds
Time (in seconds) between retransmissions. The time must be greater than the
expected round-trip delay between any two routers on the attached network.
The range is from 1 to 65535 seconds. The default is 5 seconds.
Command Modes
Usage Guidelines
Release
Modification
5.0(3)N1(1)
This command was introduced.
Use the ip ospf retransmit-interval command to set the time between LSA retransmissions. When a
router sends an LSA to its neighbor, it keeps the LSA until it receives an acknowledgment message from
the neighbor. If the router receives no acknowledgment within the retransmit interval, the local router
resends the LSA.
This command requires the LAN Base Services license.
Examples
This example shows how to set the retransmit interval value to 8 seconds:
switch(config)# interface ethernet 1/2
switch(config-if)# no switchport
switch(config-if)# ip ospf retransmit-interval 8
switch(config-if)#
Related Commands
Command
Description
copy running-config
startup-config
Saves the configuration changes to the startup configuration file.
ip ospf transmit-delay Sets the estimated time to transmit an LSA to a neighbor.
show ip ospf
Displays OSPF information.
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I Commands
ip ospf shutdown
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ip ospf shutdown
To shut down an Open Shortest Path First (OSPF) interface, use the ip ospf shutdown command. To
return to the default, use the no form of this command.
ip ospf shutdown
no ip ospf shutdown
Syntax Description
This command has no arguments or keywords.
Command Default
None
Command Modes
Usage Guidelines
Release
Modification
5.0(3)N1(1)
This command was introduced.
Use the ip ospf shutdown command to shut down OSPF on this interface.
This command requires the LAN Base Services license.
Examples
This example shows how to shut down OSPF on an interface:
switch(config)# interface ethernet 1/2
switch(config-if)# no switchport
switch(config-if)# ip ospf shutdown
switch(config-if)#
Related Commands
Command
Description
copy running-config
startup-config
Saves the configuration changes to the startup configuration file.
show ip ospf
Displays OSPF information.
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I Commands
ip ospf transmit-delay
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ip ospf transmit-delay
To set the estimated time required to send an Open Shortest Path First (OSPF) link-state update packet
on the interface, use the ip ospf transmit-delay command. To return to the default, use the no form of
this command.
ip ospf transmit-delay seconds
no ip ospf transmit-delay
Syntax Description
seconds
Command Default
1 second
Time (in seconds) required to send a link-state update. The range is from 1 to
450 seconds, and the default is 1.
Command Modes
Usage Guidelines
Release
Modification
5.0(3)N1(1)
This command was introduced.
Use the ip ospf transmit-delay command to set the estimated time needed to send an LSA update
packet. OSPF increments the LSA age time by the transmit delay amount before transmitting the LSA
update. You should take into account the transmission and propagation delays for the interface when you
set this value.
This command requires the LAN Base Services license.
Examples
This example shows how to set the transmit delay value to 8 seconds:
switch(config)# interface ethernet 1/2
switch(config-if)# no switchport
switch(config-if)# ip ospf transmit-delay 8
switch(config-if)#
Related Commands
Command
Description
copy running-config
startup-config
Saves the configuration changes to the startup configuration file.
ip ospf
retransmit-interval
Sets the estimated time between LSAs transmitted from this interface.
show ip ospf
Displays OSPF information.
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I Commands
ip router ospf area
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ip router ospf area
To specify the Open Shortest Path First (OSPF) instance and area for an interface, use the ip router ospf
area command. To return to the default, use the no form of this command.
ip router ospf instance-tag area area-id [secondaries none]
no ip router ospf instance-tag area area-id [secondaries none]
Syntax Description
Command Default
instance-tag
Instance tag. The instance-tag can be an alphanumeric string of 20
characters.
area-id
Identifier for the OSPF area where you want to enable authentication.
The area ID can be either a positive integer value from 0 to
4294967295 or an IP address.
secondaries none
(Optional) Excludes secondary IP addresses.
10 seconds
Command Modes
Usage Guidelines
Release
Modification
5.0(3)N1(1)
This command was introduced.
Use the ip router ospf area command to specify the area and OSPF instance for the interface.
This command requires the LAN Base Services license.
Examples
This example shows how to configure an interface for OSPF:
switch# configure terminal
switch(config)# interface ethernet 1/2
switch(config-if)# no switchport
switch(config-if)# ip router ospf Base area 33
switch(config-if)#
Related Commands
Command
Description
copy running-config
startup-config
Saves the configuration changes to the startup configuration file.
show ip ospf interface
Displays OSPF interface-related information.
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I Commands
ip router ospf multi-area
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ip router ospf multi-area
To configure a multi-area adjacency on an Open Shortest Path First (OSPF) interface, use the ip router
ospf multi-area command. To return to the default, use the no form of this command.
ip router ospf instance-tag multi-area area-id
no ip router ospf instance-tag multi-area area-id
Syntax Description
Command Default
instance-tag
Instance tag. Specify as an case-sensative alphanumeric string up to
20 characters.
area-id
Identifier for the OSPF area where you want to add as another area to
the primary interface. The area ID can be either a positive integer
value from 0 to 4294967295 or an IP address.
None
Command Modes
Usage Guidelines
Release
Modification
5.0(3)N1(1)
This command was introduced.
Before you use this command, make sure that you enable OSPF on the switch.
This command requires the LAN Base Services license.
Examples
This example shows how to configure a multi-area adjacency:
switch# configure terminal
switch(config)# interface ethernet 1/2
switch(config-if)# no switchport
switch(config-if)# ip router ospf Base area 33
switch(config-if)# ip router ospf Base multi-area 99
switch(config-if)#
Related Commands
Command
Description
copy running-config
startup-config
Saves the configuration changes to the startup configuration file.
feature ospf
Enables OSPF on the switch.
show ip ospf interface
Displays OSPF interface-related information.
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I Commands
ip router ospf multi-area
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I Commands
ip router ospf multi-area
Se n d c o m m e n t s t o n ex u s 5 k - d o c f e e d b a ck @ c i s c o . c o m
Cisco Nexus 5000 Series NX-OS Unicast Routing Command Reference
OL-25836-01
UCR-645
I Commands
ip router ospf multi-area
Se n d c o m m e n t s t o n ex u s 5 k - d o c f e e d b a ck @ c i s c o . c o m
Cisco Nexus 5000 Series NX-OS Unicast Routing Command Reference
UCR-646
OL-25836-01
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