Implementing Hardware and Software Redundancy on Modular Switches
How to configure NSF

In addition to configuring SSO, the following considerations must be made for all protocols configured on the MLS when SSO with NSF is implemented.

  • Configuring and verify Multicast MLS NSF with SSO
  • Configuring and verify BGP NSF
  • Configuring and verify OSPF NSF
  • Configuring and verify IS-IS NSF
  • Configuring and verify EIGRP NSF
CAUTION:

Full NSF support requires NSF configuration steps for all routing protocols running at the time of failover.

Example: NSF Configuration for EIGRP
To configure NSF for EIGRP, use the following commands beginning in privileged EXEC mode.

Verifying EIGRP for NSF
To verify NSF for EIGRP, you must check that the NSF function is configured on the SSO-enabled networking device. To verify EIGRP NSF, follow these steps:

Step 1 Verify that "nsf" appears in the EIGRP configuration of the SSO-enabled device by entering the show running-config command:

Router#show running-config
router eigrp 100
auto-summary
nsf

Step 2 Use the show ip protocols command to verify that NSF is enabled on the device:

router#show ip protocols
*** IP Routing is NSF aware ***
Routing Protocol is "eigrp 100"
Outgoing update filter list for all interfaces is not set
...
EIGRP NSF-aware route hold timer is 240s
EIGRP NSF enabled
NSF signal timer is 20s
NSF converge timer is 120s
Automatic network summarization is in effect
Maximum path: 4
Routing for Networks:
Routing Information Sources:
Gateway Distance Last Update
Distance: internal 90 external 170

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