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.
Command Modes
Usage GuidelinesThis 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.
Related Commandssummary-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
Command Modes
Usage GuidelinesUse 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.
ExamplesThis 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.