A-10
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Appendix A Online Diagnostic Tests
DFC Layer 2 Forwarding Engine Tests
TestNewLearn
The TestNewLearn test verifies the Layer 2 source MAC address learning functionality of the Layer 2
forwarding engine. For supervisor engines, a diagnostic packet is sent from the supervisor engine inband
port to verify that the Layer 2 forwarding engine is learning the new source MAC address from the
diagnostic packet. For DFC-enabled modules, a diagnostic packet is sent from the supervisor engine
inband port through the switch fabric and looped backed from one of the ports on the DFC-enabled
module. The Layer 2 learning functionality is verified during the diagnostic packet lookup by the Layer
2 forwarding engine.
TestIndexLearn
The TestIndexLearn test ensures that existing MAC address table entries can be updated. This test
verifies the Index Learn feature of the Layer 2 forwarding engine is working properly. When running the
test on the supervisor engine, the diagnostic packet is sent from the supervisor engine’s inband port and
performs a packet lookup using the supervisor engine Layer 2 forwarding engine. For DFC-enabled
Ta b l e A-14 TestDontLearn Test Attributes
Attribute Description
Disruptive/Nondisruptive
Disruptive for looped back ports. Disruption is typically less
than one second. Duration of the disruption depends on the
configuration of the looped-back port (for example, Spanning
Tree Protocol).
Recommendation Schedule during downtime.
Default This test runs by default during bootup or after a reset or OIR.
Release 12.1(13)E, 12.2(14)SX.
Corrective action None. See the system message guide for more information.
Hardware support DFC-enabled modules.
Ta b l e A- 1 5 Te s t N e w L e a r n Te s t A t t ri b u t e s
Attribute Description
Disruptive/Nondisruptive
Disruptive for looped-back ports. Disruption is typically less
than one second. Duration of the disruption depends on the
configuration of the looped-back port (for example, Spanning
Tree Protocol).
Recommendation This test runs by default during bootup or after a reset or OIR.
Default Off.
Release 12.1(13)E, 12.2(14)SX.
Corrective action None. See the system message guide for more information.
Hardware support DFC-enabled modules.
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