Cisco Cisco Nexus 7000 F1-Series 32-Port 1 and 10 Gigabit Ethernet Module Guía Para Resolver Problemas

The F1 module is different from the other N7K modules, because the ELAM begins immediately after the
trigger is configured. In order to check the status of the ELAM, enter the status command:

module−3(orion−elam)# status

Once the frame that matches the trigger is received by the FE, the ELAM status shows as Triggered:

module−3(orion−elam)# status

In order to display the ELAM results, enter the show capture command. Here is the excerpt from the ELAM
data that is most relevant to this example (some output is omitted):

module−3(orion−elam)# show capture 

dc3v4_si[11:0]           :                   17

vlanx                    :                    a

di                       :                   1e or 1f

res_eth_da               :           5056a11aef

res_eth_sa               :           5056a11a01

Note: With the F1 module, the ELAM data that is used in order to make the forwarding decision and the data
that contains the forwarding result are combined into the same output. Also, note that the MAC address
format in the ELAM output does not include prepending zeros.

Destination MAC (res_eth_da) 5056a11aef = 0050.56a1.1aef

Source MAC      (res_eth_sa) 5056a11a01 = 0050.56a1.1a01

With this output, you can verify the source Local Target Logic (LTL) (dc3v4_si), the destination LTL (di), the
VLAN (vlanx), and the source and destination MAC addresses (5056a11a01 and 5056a11aef, respectively).

The source LTL (dc3v4_si) represents the port on which the frame is received. The F1 ELAM displays two
results for the destination LTL (1e or 1f). This occurs because the ELAM parser cannot read the
least−significant bit of the ELAM data, which produces an ambiguous result. Therefore, Cisco recommends
that you validate the hardware MAC address entry for the destination address, and verify it with the
destination LTL in the ELAM.

N7K# show system internal pixm info ltl 0x17

Type            LTL

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

The output shows that the source LTL of 0x17 maps to port Eth3/18. This confirms that the frame is received
on port Eth3/18.

module−3# show hardware mac address−table fe 8

(some output omitted)

FE | Valid| PI|  BD  |      MAC      |  Index|

   |      |   |      |               |       | 

−−−+−−−−−−+−−−+−−−−−−+−−−−−−−−−−−−−−−+−−−−−−−+ 

8    1     0   34    0050.56a1.1aef