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N5672 internal vlan 4046 fabric scale

Hi

 

an someone explain to me for what the nexus switch VLAN 4046 use for?

As I already know that is an internal VLAN from the Nexus Switch.


xxx# sh vlan internal usage

VLANs DESCRIPTION
------------------- -----------------
3968-4031 Multicast
4032-4035 Online Diagnostic
4036-4039 ERSPAN
4042 Satellite
4046 Fabric scale
3968-4047,4094 Current
#xx#

 

I am asking because we have found a lot of mac entries in our network which are pointing in that particularly vlan and we don't understand why. All those mac are from different VMs from an esx platform.
We have seen this pattern (mac entries which are pointing to vlan4046/Po99) only from VMs MAC.

 

xxx# sh mac address-table | in 4046

* 4046 0050.5689.0c11 dynamic 36022630 F F Po99

* 4046 0050.5689.3cb0 dynamic 19381150 F F Po99

* 4046 0050.5689.4987 dynamic 56077160 F F Po99

* 4046 0050.5689.4bd5 dynamic 13869350 F F Po99

* 4046 0050.5689.524e dynamic 27129050 F F Po99

* 4046 0050.5689.5457 dynamic 18371640 F F Po99

* 4046 0050.5695.4f61 dynamic 235570 F F Po99

* 4046 0050.5699.27e3 dynamic 55759650 F F Po99

* 4046 0050.56b3.036b dynamic 56140940 F F Po99

* 4046 0050.56b3.26bf dynamic 29622430 F F Po99

* 4046 0050.56b3.2a76 dynamic 7254100 F F Po99

* 4046 0050.56b3.5c32 dynamic 16977850 F F Po99

* 4046 0050.56b3.60f4 dynamic 2292780 F F Po99

* 4046 0050.56b3.6c4d dynamic 46406650 F F Po99

* 4046 0050.56b3.6fe6 dynamic 48994950 F F Po99

* 4046 0050.56b3.74a9 dynamic 17086150 F F Po99

* 4046 0050.56b3.7af4 dynamic 19842180 F F Po99

* 4046 0050.56ba.5e02 dynamic 12287450 F F Po99

* 4046 8c60.4fc5.2cc1 dynamic 56140940 F F Po99


PO99 is the vpc peer link

 

xxx# sh run interface port-channel 99

!Command: show running-config interface port-channel99
!Time: Wed Sep 11 15:47:09 2019

version 7.1(5)N1(1)

interface port-channel99
description "vpc-peer-link"
switchport mode fabricpath
vpc peer-link
bfd fabricpath per-link
fabricpath isis bfd
fabricpath isis metric 200
fabricpath isis authentication-type md5
fabricpath isis authentication key-chain fp-key-chain

 

Hardware: cisco Nexus 5672UP

NXOS: 7.1(5)N1(1)

 

Thanks you for your advice.

 

Best Regards

Selina

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