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Unicast Flooding on Nexus 7018 (vPC enabled)

wandering_997
Level 1
Level 1

hi all,

I have a serious problem with nexus 7018, there're unicast flooding on one n7k, named n7k-1, which is the member of vPC domain combined with 2 N7Ks.

And I think I've already got the reason why this happened.

///////////////////////////

That is, some modules lost several addresses in their mac-address-tables.

///////////////////////////

N7K-1# show module

Mod  Ports  Module-Type                      Model              Status

---  -----  -------------------------------- ------------------ ------------

1    48     10/100/1000 Mbps Ethernet XL Mod N7K-M148GT-11L     ok

2    48     1000 Mbps Optical Ethernet XL Mo N7K-M148GS-11L     ok

5    48     1000 Mbps Optical Ethernet XL Mo N7K-M148GS-11L     ok

7    48     1000 Mbps Optical Ethernet XL Mo N7K-M148GS-11L     ok

8    48     1000 Mbps Optical Ethernet XL Mo N7K-M148GS-11L     ok

......

N7K-1# show mac address-table count

MAC Entries for all vlans :

Dynamic Address Count:                 5692

Static Address (User-defined) Count:      0

Secure Address Count:                     0

N7K-1#

N7K-1# show mac address-table 1 dynamic | in "dynamic" | wc -l

5598

N7K-1#

N7K-1# show mac address-table 2 dynamic | in "dynamic" | wc -l

5595

N7K-1#

N7K-1# show mac address-table 5 dynamic | in "dynamic" | wc -l

5665

N7K-1#

N7K-1# show mac address-table 7 dynamic | in "dynamic" | wc -l

5605

N7K-1#

N7K-1# show mac address-table 8 dynamic | in "dynamic" | wc -l

5593

N7K-1#

See, all mac counts are different from the global mac-address-table on N7K-1.


But, N7K-2 does not have this problem, all modules are ok.

N7k-2#

N7k-2# show mac address-table count

MAC Entries for all vlans :

Dynamic Address Count:                 5692

Static Address (User-defined) Count:      0

Secure Address Count:                     0

N7k-2#

N7k-2#

N7k-2#

N7k-2# show mac address-table 1 dynamic | in "dynamic" | wc -l

5692

N7k-2#

N7k-2# show mac address-table 2 dynamic | in "dynamic" | wc -l

5692

N7k-2#

N7k-2# show mac address-table 5 dynamic | in "dynamic" | wc -l

5692

N7k-2#

N7k-2# show mac address-table 7 dynamic | in "dynamic" | wc -l

5692

N7k-2#

N7k-2# show mac address-table 8 dynamic | in "dynamic" | wc -l

5692

N7k-2# 

I had clean the mac-address-table, and all mac-address-tables had been synced fine, and the unicast flooding went away.

.

But it came back again after a few hours.

How could I fix the mac-address sync function between the modules ?

Thanks.

Dayong