mac-learn disable

[sel18]

Hi team,

Please I want to be sure that the command "mac-learn disable" in SW NX 9K disable the reading of the MAC address without any impact for our VLAN or infra.

Thanks in advance.

[Sergiu.Daniluk]

Hi @sel18 

<CORRECTION>

Seems like disabling mac learning is supported in 10.2.X.

<\CORRECTION>

Anyway, why would you like to disable the mac learning? That is like converting your switch to a hub. Even if you could do this on you N9K switch, I would suggest you do not.

Apart of that, normally, there should be no impact because of flooding, but the only potential problem which I have in mind is over-subscription, which could lead to packet drops.

Thanks,

Sergiu

[sel18]

@Sergiu.Daniluk 

thank you for your reply. yes NX didn't support the mac-learn that's why i want to ask about the the ERSPAN or RSPAN in Cisco.

my goal is the mirroring of the traffic.

thanks in advance.

[Sergiu.Daniluk]

If traffic mirroring is what you are looking for, then SPAN/RSPAN/ERSPAN or Nexus Data Broker are your friends, depending on what exactly you want to do.

Take care,

Sergiu

[sel18]

thanks @Sergiu.Daniluk 

I want to know about the SPAN/RSPAN/ERSPAN from NX 9K to SW Catalyset ( it mean that ERSPAN in source only) is that possible with ERSPAN L2 traffic or not ?

regards.

[Sergiu.Daniluk]

I am still not sure what you are trying to achieve. Can you give more details?

[sel18]

@Sergiu.Daniluk 

I want to know if it is possible to config ERSPAN or RSPAN for mirroring of traffic between site A and B

We have NX9K in Site A and Catalyst in site B.

PS our NX9k is is SW L2.

thanks in advance.

[Sergiu.Daniluk · Accepted solution]

ERSPAN is the best option here. Basically the mirrored traffic will be encapsulated in GRE and forwarded directly to the destination IP address.

Here is how to configure it: https://www.letsconfig.com/how-to-configure-erspan-on-cisco-nexus-switches/

Here is how to decode it: https://packetpushers.net/erspan-new-favorite-packet-capturing-trick/

Stay safe,

Sergiu