Cisco Nexus 6000 Series NX-OS Unicast Routing Command Reference
S Commands
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S Commands

Table Of Contents

S Commands

set forwarding-address

shutdown (OSPF)

summary-address (OSPF)


S Commands


This chapter describes the Cisco NX-OS Open Shortest Path First (OSPF) commands that begin with S.

set forwarding-address

To set the Open Shortest Path First (OSPF) forwarding address for redistributed type-5 Link State Advertisements (LSAs), use the set forwarding-address command. To remove the address, use the no form of this command.

set forwarding-address

no forwarding-address

Syntax Description

This command has no arguments or keywords.

Command Default

No forwarding address is set as a default.

Command Modes

Command HistoryRoute-map configuration mode

Release
Modification

5.0(3)N1(1)

This command was introduced.


Usage Guidelines

This command is used by the OSPF to set the forwarding address for the redistributed type-5 LSAs. The value of the forwarding address specified by the autonomous system boundary router (ASBR) can be either 0.0.0.0 or nonzero. The 0.0.0.0 address indicates that the originating router (the ASBR) is the next hop.

If the ASBR redistributes routes and OSPF is not enabled on the next hop interface for those routes, the forwarding address is set to 0.0.0.0 .

All of the following conditions must be met to set the forwarding address field to a nonzero address:

OSPF is enabled on the ASBR's next hop interface.

ASBR's next hop interface is non-passive under OSPF.

ASBR's next hop interface is not point-to-point.

ASBR's next hop interface is not point-to-multipoint.

For all other conditions, set the forwarding address to 0.0.0.0.

Examples

This example shows how to set the forwarding address:

switch(config)# route-map test1 10 permit
switch(config-route-map)# set forwarding-address
 
   

Related Commands

Command
Description

match as-path

Matches a BGP autonomous system path access list.

match community

Matches a BGP community.

match ip next-hop

Redistributes any routes that have a next-hop router address passed by one of the access lists specified.

match ip route-source

Redistributes routes that have been advertised by routers and access servers at the address specified by the access lists.

match metric

Redistributes routes with the metric specified.

match tag

Redistributes routes in the routing table that match the specified tags.

route-map (IP)

Defines the conditions for redistributing routes from one routing protocol into another.

set as-path

Modifies an autonomous system path for BGP routes.

set community

Sets the BGP communities attribute.

set level

Indicates where to import routes.

set local-preference

Specifies a preference value for the autonomous system path.

set metric

Sets the metric value for a routing protocol.

set metric-type

Sets the metric type for the destination routing protocol.

set next-hop

Specifies the address of the next hop.

set tag

Sets a tag value of the destination routing protocol.

set weight

Specifies the BGP weight for the routing table.


shutdown (OSPF)

To stop an Open Shortest Path First (OSPF) instance without removing the configuration, use the shutdown command. To start a stopped OSPF instance, use the no form of this command.

shutdown

no shutdown

Syntax Description

This command has no arguments or keywords.

Command Default

No process is stopped.

Command Modes

Command HistoryRouter configuration mode
VRF configuration mode

Release
Modification

5.0(3)N1(1)

This command was introduced.


Usage Guidelines

Entering the shutdown command stops a router process but does not remove any configuration parameters. The shutdown command is displayed in the running configuration file when enabled.

This command requires the LAN Base Services license.

Examples

This example shows how to stop an active OSPF instance:

switch(config)# router ospf firstcompany
switch(config-router)# shutdown
 
   

Related Commands

Command
Description

feature ospf

Enables OSPF on the router.

router ospf

Configures an OSPF instance.


summary-address (OSPF)

To create aggregate addresses for the Open Shortest Path First (OSPF) protocol, use the summary-address command. To return to the default, use the no form of this command.

summary-address ip-prefix/length [not-advertise] [tag tag]

no summary-address ip-prefix/length [not-advertise] [tag tag]

Syntax Description

ip-prefix/length

IP prefix designated for a range of addresses, including the prefix length. Specify ip-prefix as an IP address. Specify length as a number from 1 to 31.

not-advertise

(Optional) Suppresses routes that match the specified prefix/length pair.

tag tag

(Optional) Specifies the tag value that can be used as a match value for controlling redistribution using route maps. The range is from 1 to 65535.


Command Default

None

Command Modes

Command HistoryRouter configuration mode

Release
Modification

5.0(3)N1(1)

This command was introduced.


Usage Guidelines

Use the summary-address command to create an aggregate address to replace a series of more-specific addresses. The metric used to advertise the summary is the smallest metric of all the more specific routes.

Use this command to help reduce the size of the routing table and allow an OSPF Autonomous System Boundary Router (ASBR) to advertise one external route as an aggregate for all redistributed routes that are covered by the address.

This command requires the LAN Base Services license.

Examples

This example shows how to configure the summary address 192.0.0.0 to include address 192.0.1.0, 192.0.2.0, 192.0.3.0, and so on. Only the address 192.0.0.0 is advertised in an external link-state advertisement.

switch(config)# router ospf 201
switch(config-router)# summary-address 192.0.0.0/16
 
   

Related Commands

Command
Description

copy running-config startup-config

Saves the configuration changes to the startup configuration file.

redistribute (OSPF)

Redistributes external routing protocol routes into OSPF.

show ip ospf summary-address

Displays OSPF summary-address redistribution information.