VXLAN Static Ingress Replication

Lessons Discussion
21

What is the significance of using 0.0.0.0 as the area for the ospf config? Is that a nexus specific requirement?

22

Hello Adam

The area ID for OSPF is a 32-bit number. In most modern network operating systems for Cisco, it can be expressed as a decimal number, or it can be entered in dotted decimal format. This includes the NX-OS. Take a look at this NetworkLessons note for more information.

I hope this has been helpful!

Laz

23

Hello Rene,

Why i noticed nothing in dynamic mac address table of both switch. The ping is reacheable between both S1 and S2 and the underalay / overlay VXLAN network are up ?

24

Hello Abderrahmane

Hmm, thatā€™s interesting. So the MAC address table of both Leaf switches is empty even though your pings are successful? There should be at least the entry of the MAC address of each host on interface Ethernet 1/2. Can you confirm that this is the case? Let us know, and if thatā€™s the case, I would like to try to lab this up and replicate your resultsā€¦ I look forward to hearing from you!

I hope this has been helpful!

Laz

25

Hello Lazz,

Thanks for Reply ! No entries in the show mac address table dynamic, evenif the both servers can reach other . As you can see below the configuration of both leafs and the result of ICMP result:

FYI Lazz: iā€™m using nxosv9k-v9.3.1 image in both leafs.

I hope this has been helpful for you ! Waiting for your reply :slight_smile:

Lazz2
Lazz21157Ɨ508 58.9 KB

lazz3
lazz31216Ɨ487 56.4 KB

26

Hello Abderrahmane

Thanks for sharing your topology and results with us! I went into the CML lab using C9300v with NXOS version 10.3(1) for the leaf switches, and IOS routers for the hosts. When I issued the ping command and it was successful, I then went into the MAC address table on both Leaf switches, and found that the entries did appear in the MAC address table:

LEAF1# show mac address-table dynamic 
Legend: 
        * - primary entry, G - Gateway MAC, (R) - Routed MAC, O - Overlay MAC
        age - seconds since last seen,+ - primary entry using vPC Peer-Link,
        (T) - True, (F) - False, C - ControlPlane MAC, ~ - vsan,
        (NA)- Not Applicable
   VLAN     MAC Address      Type      age     Secure NTFY Ports
---------+-----------------+--------+---------+------+----+------------------
*   10     0050.c253.3001   dynamic  NA         F      F    Eth1/1
*   10     0050.c253.4001   dynamic  NA         F      F    nve1(2.2.2.2)
LEAF1#

So I was unable to replicate your results :frowning: .

I donā€™t know why your topology is showing up like this. At the very least, your E1/2 interfaces are normal interfaces on switchports, and frames entering those should populate the MAC address table. The only thing I can think of is that it is a bug of the emulator youā€™re using (it looks like GNS3, right?).

I hope this has been helpful!

Laz