- passive-interface
- passive-interface default
- passive-interface default (EIGRP)
- platform ip verify
- platform ip verify address
- platform ip verify length
- platform ipv6 verify
- preempt (GLBP)
- preempt (HSRP)
- preempt (VRRP)
- peer-gateway exclude
- priority (GLBP)
- priority (HSRP)
- priority (VRRP)
- protocol shutdown (OSPF)
- protocol shutdown (OSPFv3)
P Commands
This chapter describes the Cisco NX-OS unicast routing commands that begin with the letter P.
passive-interface
To suppress routing updates on an interface, use the passive-interface command. To revert to the default settings, use the no form of this command.
Syntax Description
Defaults
Command Modes
Command History
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Usage Guidelines
Examples
This example shows how to suppress routing updates on the interface:
switch(config)# interface ethernet 5/4
switch(config-router)# passive-interface default
switch(config-router)#
This example shows how to remove the configuration for the routing updates suppression :
switch(config)# interface ethernet 5/4
switch(config-router)# no passive-interface default
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passive-interface default
To remove the passive-interface commands on the interface (if any) and return the interface to the default configuration, use the passive-interface default command.
passive-interface default {level-1 | level-1-2 | level-2}
Syntax Description
Defaults
Command Modes
Router configuration (config-router) mode
Command History
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Usage Guidelines
Examples
This example shows how to remove the passive-interface commands on the interface and return the interface to the default configuration:
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Creates a new IS-IS instance and enters router configuration mode. |
passive-interface default (EIGRP)
To suppress Enhanced Interior Gateway Routing Protocol (EIGRP) hellos, use the passive-interface default command. To revert to the default, use the no form of this command.
Syntax Description
Defaults
Command Modes
Command History
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Usage Guidelines
Suppressing the EIGRP hellos prevents neighbors from forming and sending routing updates on all EIGRP interfaces.
Examples
This example shows how to suppress EIGRP hellos:
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Creates a new IS-IS instance and enters router configuration mode. |
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platform ip verify
To configure IP packet verification, use the platform ip verify command. To return to default, use the no form of this command.
platform ip verify { checksum | fragment | tcp tiny-frag | version }
no platform ip verif y { checksum | fragment }
Syntax Description
Defaults
Command Modes
Command History
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This command was replaced by the hardware ip verify command. |
Usage Guidelines
Use the platform ip verify command to configure packet verification tests on IPv4 and IPv6 packets based on checksum or fragments.
Examples
This example shows how to drop fragmented IPv4 or IPv6 packets:
Related Commands
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Configures IPv4 and IPv6 packet verification checks based on addresses. |
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platform ip verify address
To packet verification on IP addresses, use the platform ip verify address command. To return to default, use the no form of this command.
platform ip verify address { destination zero | identical | reserved | source { broadcast | multicast }}
no platform ip verify address { destination zero | identical | reserved | source { broadcast | multicast }}
Syntax Description
Defaults
Command Modes
Command History
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This command was replaced by the hardware ip verify address command. |
Usage Guidelines
Use the platform ip verify address command to configure packet verification tests on IPv4 and IPv6 packets based on addresses.
Examples
This example shows how to drop broadcast IPv4 packets:
Related Commands
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Configures IPv4 and IPv6 packet verification checks based on checksum or fragments. |
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platform ip verify length
To configure IPv4 packet verification based on packet length, use the platform ip verify length command. To return to the default, use the no form of this command.
platform ip verify length { consistent | maximum { max-frag | max-tcp | udp } | minimum }
no platform ip verify length { consistent | maximum { max-frag | max-tcp | udp } | minimum }
Syntax Description
Defaults
Command Modes
Command History
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This command was replaced by the hardware ip verify length command. |
Usage Guidelines
Use the platform ip verify length command to configure packet verification tests on IPv4 and IPv6 packets based on packet length
Examples
This example shows how to drop minimum-length IPv4 packets:
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Configures IPv4 packet verification checks based on checksum or fragments. |
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Configures IPv4 and IPv6 packet verification checks based on addresses. |
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platform ipv6 verify
To configure IPv6 packet verification, use the platform ipv6 verify command. To return to default, use the no form of this command.
platform ipv6 verify { length { consistent | maximum { max-frag | max-tcp | udp } | tcp tiny-frag | version }
no platform ip verify { checksum | fragment }
Syntax Description
Defaults
Command Modes
Command History
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This command was replaced by the hardware ipv6 verify command. |
Usage Guidelines
Use the platform ipv6 verify command to configure packet verification tests on IPv6 packets.
Examples
This example shows how to drop all IPv4 packets:
Related Commands
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Configures IPv4 and IPv6 packet verification checks based on addresses. |
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preempt (GLBP)
To configure the gateway to take over as active virtual gateway (AVG) for a Gateway Load Balancing Protocol (GLBP) group if it has a higher priority than the current AVG, use the glbp preempt command. To disable this feature, use the no form of this command.
Cisco NX-OS Release 4.1(3) and later syntax:
preempt [ delay minimum seconds ]
no preempt [ delay minimum seconds ]
Cisco NX-OS Release 4.1(2) and earlier syntax:
preempt [ delay minimum seconds ]
no preempt [ delay minimum seconds [ sync seconds ] ]
Syntax Description
Defaults
A GLBP gateway with a higher priority than the current AVG cannot assume the role of AVG.
The default delay value is 30 seconds.
Command Modes
Command History
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Usage Guidelines
Examples
This example shows how to configure a router to preempt the current AVG when its priority of 254 is higher than the current AVG. If the router preempts the current AVG, it waits 60 seconds before assuming the role of AVG.
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preempt (HSRP)
To configure a preemption delay, use the preempt command. To disable this feature, use the no form of this command.
preempt [ delay {minimum min-delay | reload rel-delay | sync sync-delay }]
no preempt [ delay {minimum min-delay | reload rel-delay | sync sync-delay }]
Syntax Description
Defaults
Command Modes
Interface configuration or HSRP template mode
Command History
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Usage Guidelines
This command does not require a license.
Specifying a minimum delay allows routing tables to be updated before a router becomes active. When a router first comes up, it does not have a complete routing table. A high-priority router will only delay preemption if it first receives a Hello packet from a low-priority active router. If the high-priority router does not receive a Hello packet from the low-priority active router when it is starting up, then it assumes there is no active router for the group and will become active as soon as possible.
Examples
This example shows how to configure a delay when a router becomes active when its priority is 110:
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preempt (VRRP)
To enable a high-priority backup virtual router to preempt the low-priority master virtual router, use the preempt command. To disable a high-priority backup virtual router from preempting the low-priority master virtual router, use the no form of this command.
Syntax Description
Defaults
Command Modes
Command History
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Usage Guidelines
VRRP enables you to preempt a virtual router backup that has taken over for a failing virtual router master with a high-priority virtual router backup that has become available.
By default, a preemptive scheme is enabled. A backup high-priority virtual router that becomes available takes over for the backup virtual router that was elected to become the virtual router master. If you disable preemption, then the backup virtual router that is elected to become the virtual router master remains the master until the original virtual router master recovers and becomes the master again.
If the virtual IP address is also the IP address for the interface, then preemption is applied.
Examples
This example shows how to enable the backup high-priority virtual router to preempt the low-priority master virtual router:
Note
This preemption does not apply to the primary IP address.
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Clears all the software counters for the specified virtual router. |
peer-gateway exclude
To exclude a VLAN from peer gateway, when a VLAN interface is used for Layer 3 backup routing on the virtual port-channel (vPC) peer devices and an F1 module is used as peer-link, use the vpc peer-gateway exclude-vlan command. To revert to the default settings, use the no form of this command.
peer-gateway exclude-vlan vlan-number
peer-gateway exclude-vlan vlan-number
Syntax Description
VLAN number. The range is from 1 to 2499 and from 2628 to 4093. |
Defaults
Command Modes
vPC configuration (config-vpc-domain)
Command History
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Usage Guidelines
Use the peer-gateway exclude-vlan command to configure a Layer 3 backup routing VLAN whenever you use the vPC peer-gateway feature.
If the vPC peer link is configured on a Cisco Nexus 32-port 1/10 Gigabit Ethernet (F1-Series) module (N7K-F132XP-15), then you must include the Layer 3 backup routing VLAN in the VLAN list specified by the vpc peer-gateway exclude command.
If the vPC peer link is configured on an M1 series module, then you should include the Layer 3 backup routing VLAN in the VLAN list specified by the vpc peer-gateway exclude command, but it is not required.
The peer-gateway functionality is not enabled for those VLANs specified in the exclude VLAN list. If no exclude VLAN list is specified, then this functionality is enabled for all VLANs.
The latest occurrence of this configuration overwrites all previous configurations.
The no vpc peer-gateway command also disables IP redirects on all VLANs.
Examples
This example shows how to exclude a VLAN from peer gateway:
switch(config-vpc-domain)#
This example shows how to disable the peer-gateway functionality:
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priority (GLBP)
To set the priority level of the gateway within a Gateway Load Balancing Protocol (GLBP) group, use the priority command. To remove the priority level of the gateway, use the no form of this command.
Syntax Description
Priority of the gateway within the GLBP group. The range is from 1 to 255. The default is 100. |
Defaults
Command Modes
Command History
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Usage Guidelines
Use the priority command to control which virtual gateway becomes the active virtual gateway (AVG). GLBP compares the priorities of all virtual gateways in the GLBP group and selects the gateway with the numerically highest priority as the AVG. If two virtual gateways have equal priority, GLBP selects the gateway with the highest IP address.
Examples
This example shows how to configure a virtual gateway with a priority of 254:
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Configures a gateway to take over as the AVG for a GLBP group if it has a higher priority than the current AVG. |
priority (HSRP)
To set the priority level within a Hot Standby Router Protocol (HSRP) group, use the priority command. To remove the priority level, use the no form of this command.
priority level [ forwarding-threshold lower lower-value upper upper-value ]
no priority level [ forwarding-threshold lower lower-value upper upper-value ]
Syntax Description
Defaults
Command Modes
HSRP configuration or HSRP template mode
Command History
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Added support for forwarding-threshold, lower, and upper keywords. |
Usage Guidelines
Use the priority command to control which virtual router becomes the active router. HSRP compares the priorities of all virtual routers in the HSRP group and selects the router with the numerically highest priority. If two virtual routers have equal priority, HSRP selects the router with the highest IP address.
Examples
This example shows how to configure a virtual router with a priority of 254:
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priority (VRRP)
To set the priority for the Virtual Router Redundancy Protocol (VRRP), use the priority command. To revert to the default value, use the no form of this command.
priority level [ forwarding-threshold lower lower-value upper upper-value ]
no priority level [ forwarding-threshold lower lower-value upper upper-value ]
Syntax Description
Defaults
The default value is 100. For switches whose interface IP address is the same as the primary virtual IP address, the default value is 255.
Command Modes
Command History
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Added support for forwarding-threshold, lower, and upper keywords. |
Usage Guidelines
The priority determines whether or not a VRRP router functions as a virtual router backup, the order of ascendancy for the VRRP router to become a virtual router master if the virtual router master fails, the role that each VRRP router plays, and what happens if the virtual router master fails.
If a VRRP router owns the IP address of the virtual router and the IP address of the physical interface, then this router will function as a virtual router master.
By default, a preemptive scheme is enabled. A backup high-priority virtual router that becomes available takes over for the backup virtual router that was elected to become the virtual router master. If you disable preemption, then the backup virtual router that is elected to become the virtual router master remains the master until the original virtual router master recovers and becomes the master again.
Examples
This example shows how to specify the priority for a virtual router:
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protocol shutdown (OSPF)
To shut down an Open Shortest Path First (OSPF) instance, use the protocol shutdown command. To disable this function, use the no form of this command.
Syntax Description
Defaults
Command Modes
Router configuration
Router VRF configuration
Command History
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Usage Guidelines
Use the protocol shutdown command to configure disable an instance of OSPF without removing the configuration.
Examples
This example shows how to disable OSPF 209:
protocol shutdown (OSPFv3)
To shut down an Open Shortest Path First version 3 (OSPFv3) instance, use the protocol shutdown command. To disable this function, use the no form of this command.
Syntax Description
Defaults
Command Modes
Router configuration
Router VRF configuration
Command History
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Usage Guidelines
Use the protocol shutdown command to configure disable an instance of OSPFv3 without removing the configuration.
Examples
This example shows how to disable OSPFv3 209:
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