External L2 domain extension

[oni.shahin]

Hi,

I have extended the EPG to a external Layer 3 switch (no L2 domain extension), so the external Layer 3 switch SVI and the Endpoint connecter to leaf switch are under the same EPG. Ping from the Gateway works but drops intermittent packets.

Now my query is  I have read the BD for that EPG has to have a subnet. I have configured the subnet with the same IP address of the SVI on the external Layer 3 switch.

Is this the right way of doing it? can someone please direct me to any documentation for the configuration.

Kind regards

[Tomas de Leon]

I you are creating a static path L2 extension in the EPG you do not have to define a subnet for the BD.  And as you noted, the default gateway is the SVI for the vlan on your external layer 3 switch.  Now, if you have devices in the same vlan in another EPG which is attached to the SAME BD then you need to define a subnet with a default gateway. the Default gw in the fabric is "different" from the external gw.  

Since you are using the SAME ip address for the GW inside and outside is the reason why you are having intermittent loss.

Thank you for using the Cisco Support Community!

T.