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This chapter describes the Cisco NX-OS unicast routing commands that begin with the letter F.
To enable the Border Gateway Protocol (BGP), use the feature bgp command. To disable BGP, use the no form of this command.
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You must enable the BGP feature before you can configure BGP.
This example shows how to enable a BGP configuration:
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To enable the Enhanced Interior Gateway Protocol (EIGRP), use the feature eigrp command. To disable EIGRP, use the no form of this command.
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You must enable the EIGRP feature before you can configure EIGRP.
This example shows how to enable the EIGRP feature:
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To enable the Gateway Load Balancing Protocol (GLBP), use the feature glbp command. To disable GLBP, use the no form of this command.
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You must globally enable GLBP before you can configure any GLBP options or create a GLBP group.
This example shows how to enable GLBP:
To enter Hot Standby Router Protocol (HSRP) configuration mode and enable HSRP, use the feature hsrp command. To disable HSRP, use the no form of this command.
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Use the feature hsrp command to enter HSRP configuration mode and enable HSRP.
This example shows how to enable HSRP on Ethernet interface 1/1:
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To enable the authentication package for Open Short Path First version 3 (OSPFv3) packets, use the feature imp command. To disable the authentication package, use the no form of this command.
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This example shows how to enable authentication package:
To enable the Intermediate System to Intermediate System Protocol (IS-IS), use the feature isis command. To disable ISIS, use the no form of this command.
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You must enable the IS-IS feature before you can configure IS-IS.
This example shows how to enable the IS-IS feature:
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To enable the Open Shortest Path First Protocol (OSPF), use the feature ospf command. To disable OSPF, use the no form of this command.
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You must enable the OSPF feature before you can configure OSPF.
This example shows how to enable the OSPF feature:
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To enable the Open Shortest Path First version 3 Protocol (OSPFv3), use the feature ospfv3 command. To disable OSPFv3, use the no form of this command.
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You must enable the OSPFv3 feature before you can configure OSPFv3.
This example shows how to enable the OSPv3 feature:
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To enable the policy-based routing (PBR) feature, use the feature pbr command. To disable PBR, use the no form of this command.
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You must enable the PBR feature before you can configure policy-based routing.
This example shows how to enable the PBR feature:
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To enable the Routing Information Protocol (RIP), use the feature rip command. To disable RIP, use the no form of this command.
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You must enable the RIP feature before you can configure RIP.
This example shows how to enable the RIP feature:
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To enable the Virtual Router Redundancy Protocol (VRRP), use the feature vrrp command. To disable VRRP, use the no form of this command.
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You must enable the VRRP feature before you can configure VRRP.
This example shows how to enable the VRRP feature:
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Clears all the software counters for the specified virtual router. |
To enable Virtual Router Redundancy Protocol (VRRP) version 3 and Virtual Router Redundancy Service (VRRS), use the feature vrrpv3 command. To disable VRRPv3 and VRRS in a VDC, use the no form of this command.
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If VRRPv2 is configured, use the no feature vrrp command in global configuration mode to remove the VRRPv2 configuration and then use the feature vrrpv3 command to enable VRRPv3.
This example shows how to enable VRRPv3 and VRRS:
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Creates a VRRPv3 group and enters VRRPv3 group configuration mode. |
To enable the Web Cache Communication Protocol (WCCP), use the feature wccp command. To disable WCCP, use the no form of this command.
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You must enable the WCCP feature before you can configure WCCPv2.
This example shows how to enable the WCCP feature:
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To flush routes on a nongraceful controlled restart for the Open Shortest Path First (OSPF) protocol, use the flush-routes command. To disable this feature, use the no form of this command.
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Use the flush-routes command when the OSPF Graceful Restart feature is not enabled.
This commands causes OSPF to unregister from the unicast RIB when OSPF shuts down. The unicast RIB removes all the routes associated with this OSPF instance. If you do not configure the flush-routes command, OSPF will not unregister and the OSPF routes will be stale. The OSPF routs are eventually removed from the unicast RIB after a timeout period. If OSPF comes back up in p in graceful restart mode, the routes will be refreshed in the unicast RIB.
This example shows how to flush routes for a nongraceful restart:
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To flush routes on a nongraceful controlled restart for the Open Shortest Path First version 3 (OSPFv3) protocol, use the flush-routes command. To disable this feature, use the no form of this command.
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Use the flush-routes command when the OSPFv3 Graceful Restart feature is not enabled.
This commands causes OSPF to unregister from the unicast RIB when OSPFv3 shuts down. The unicast RIB removes all the routes associated with this OSPF instance. If you do not configure the flush-routes command, OSPFv3 will not unregister and the OSPFv3 routes will be stale. The OSPFv3 routs are eventually removed from the unicast RIB after a timeout period. If OSPFv3 comes back up in p in graceful restart mode, the routes will be refreshed in the unicast RIB.
This example shows how to flush routes for a nongraceful restart:
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To configure a regular Hot Standby Redundancy Protocol (HSRP) group as a slave group, use the follow command. To return the slave group to a regular HSRP group, use the no form of this command.
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Configuring an HSRP group as a slave group clears the group’s other configurations, such as its virtual IP address without notification, so you must enter the follow command before you enter the ip command.
Slave groups may forward reference master group names that are undefined.
This example shows how to configure a regular HSRP group as a slave group:
This example shows how to remove a regular HSRP group from a slave group:
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To configure a gateway to take over as the active virtual forwarder (AVF) for a Gateway Load Balancing Protocol (GLBP) group if the current AVF falls below its low weighting threshold, use the forwarder preempt command. To disable this function, use the no form of this command.
forwarder preempt [ delay minimum seconds ]
no forwarder preempt [ delay minimum seconds ]
(Optional) Specifies a minimum number of seconds that the gateway delays before taking over the role of AVF. The range is from 0 to 3600 seconds with a default delay of 30 seconds. |
Forwarder preemption is enabled with a default delay of 30 seconds.
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This example shows how to configure a gateway to preempt the current AVF when the current AVF falls below its low weighting threshold. If the gateway preempts the current AVF, it waits 60 seconds before taking over the role of the AVF.
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