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​Nexus 9000v - VxLAN - VxLAN Multicast Flood and Learn

Picture
Leveraging IP Multicast to handle the BUM traffic allows a single packet to be sent to the Multicast group associated to the VNI. These BUM packets are sent to that group and then sent to every VTEP that has joined that multicast group. This will include ARP requests.


N9K-2
feature vn-segment-vlan-based
feature nv overlay
!
vlan 10
  name VLAN10
  vn-segment 10010
!
vlan 20
vlan 20
  vn-segment 20020
!
interface nve1
  no shutdown
  source-interface loopback0
  member vni 10010
    mcast-group 224.0.1.10
  member vni 20020
    mcast-group 224.0.1.20
!
interface Ethernet1/5
  switchport mode trunk
!
interface Ethernet1/2
  switchport access vlan 10
  spanning-tree port type edge

interface Ethernet1/3
  switchport access vlan 20
  spanning-tree port type edge

N9K-3
feature vn-segment-vlan-based
feature nv overlay
vlan 10
  name VLAN10
  vn-segment 10010
!
​vlan 20
vlan 20
  vn-segment 10020
!

interface nve1
  no shutdown
  source-interface loopback0
  member vni 10010
    mcast-group 224.0.1.10
  member vni 10020
    mcast-group 224.0.1.20
!
interface Ethernet1/2
  switchport access vlan 10
  spanning-tree port type edge

interface Ethernet1/3
  switchport access vlan 20
  spanning-tree port type edge


N9K-2# show ip mroute
IP Multicast Routing Table for VRF "default"

(*, 224.0.1.10/32), uptime: 00:04:47, nve ip pim 
  Incoming interface: Ethernet1/1, RPF nbr: 10.1.2.1
  Outgoing interface list: (count: 1)
    nve1, uptime: 00:04:47, nve


(10.0.0.2/32, 224.0.1.10/32), uptime: 00:04:47, nve mrib ip pim 
  Incoming interface: loopback0, RPF nbr: 10.0.0.2
  Outgoing interface list: (count: 1)
    Ethernet1/1, uptime: 00:04:47, pim


(*, 224.0.1.20/32), uptime: 00:04:36, nve pim ip 
  Incoming interface: Ethernet1/1, RPF nbr: 10.1.2.1
  Outgoing interface list: (count: 1)
    nve1, uptime: 00:04:36, nve


(10.0.0.2/32, 224.0.1.20/32), uptime: 00:04:36, nve mrib pim ip 
  Incoming interface: loopback0, RPF nbr: 10.0.0.2
  Outgoing interface list: (count: 1)
    Ethernet1/1, uptime: 00:03:46, pim


(*, 232.0.0.0/8), uptime: 00:11:03, pim ip 
  Incoming interface: Null, RPF nbr: 0.0.0.0
  Outgoing interface list: (count: 0)



N9K-3# show ip mroute
IP Multicast Routing Table for VRF "default"

(*, 224.0.1.10/32), uptime: 00:04:23, nve ip pim 
  Incoming interface: Ethernet1/1, RPF nbr: 10.1.3.1
  Outgoing interface list: (count: 1)
    nve1, uptime: 00:04:23, nve


(10.0.0.3/32, 224.0.1.10/32), uptime: 00:04:23, nve mrib ip pim 
  Incoming interface: loopback0, RPF nbr: 10.0.0.3
  Outgoing interface list: (count: 1)
    Ethernet1/1, uptime: 00:03:47, pim


(*, 224.0.1.20/32), uptime: 00:04:18, nve ip pim 
  Incoming interface: Ethernet1/1, RPF nbr: 10.1.3.1
  Outgoing interface list: (count: 1)
    nve1, uptime: 00:04:18, nve


(10.0.0.3/32, 224.0.1.20/32), uptime: 00:04:18, nve mrib ip pim 
  Incoming interface: loopback0, RPF nbr: 10.0.0.3
  Outgoing interface list: (count: 1)
    Ethernet1/1, uptime: 00:03:46, pim


(*, 232.0.0.0/8), uptime: 00:11:05, pim ip 
  Incoming interface: Null, RPF nbr: 0.0.0.0
  Outgoing interface list: (count: 0)



VPCS> ping 10.1.10.7

84 bytes from 10.1.10.7 icmp_seq=1 ttl=64 time=27.027 ms
84 bytes from 10.1.10.7 icmp_seq=2 ttl=64 time=27.472 ms
84 bytes from 10.1.10.7 icmp_seq=3 ttl=64 time=28.258 ms
84 bytes from 10.1.10.7 icmp_seq=4 ttl=64 time=27.453 ms
84 bytes from 10.1.10.7 icmp_seq=5 ttl=64 time=26.353 ms


VPCS> ping 10.1.20.8

84 bytes from 10.1.20.8 icmp_seq=1 ttl=64 time=31.223 ms
84 bytes from 10.1.20.8 icmp_seq=2 ttl=64 time=27.656 ms
84 bytes from 10.1.20.8 icmp_seq=3 ttl=64 time=34.899 ms
84 bytes from 10.1.20.8 icmp_seq=4 ttl=64 time=26.695 ms
84 bytes from 10.1.20.8 icmp_seq=5 ttl=64 time=24.362 ms


N9K-2# 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
   VLAN     MAC Address      Type      age     Secure NTFY Ports
---------+-----------------+--------+---------+------+----+------------------
*   10     0050.7966.6804   dynamic  0         F      F    Eth1/2
*   10     0050.7966.6807   dynamic  0         F      F    nve1(10.0.0.3)
*   20     0050.7966.6808   dynamic  0         F      F    nve1(10.0.0.3)


​N9K-3# 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
   VLAN     MAC Address      Type      age     Secure NTFY Ports
---------+-----------------+--------+---------+------+----+------------------
*   10     0050.7966.6804   dynamic  0         F      F    nve1(10.0.0.2)
*   10     0050.7966.6807   dynamic  0         F      F    Eth1/2
*   20     0050.7966.6805   dynamic  0         F      F    nve1(10.0.0.2)
*   20     0050.7966.6808   dynamic  0         F      F    Eth1/3
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  • Home
  • Technology VoD!
    • Cisco >
      • Route & Switch / Enterprise Infrastructure
  • Technology Breakdowns!
    • Route&Switch/Ent. Infra. >
      • L2 Technologies
      • L3 Technologies
      • VPN Technologies
      • Services >
        • IOS - Dynamic NAT
        • HSRP - IPv4 Setup
        • HSRP - Priority and Preemption
    • Service Provider >
      • IGPs (Interior Gateway Protocols)
      • First Hop Redundancy >
        • HSRP (Hot Standby Router Protocol) >
          • HSRP - IOS/IOS XE Setup
          • HSRP - IOS XR Setup
      • BGP (Border Gateway Protocol)
      • Inter AS Multicast (MSDP)
      • Intra-AS MPLS
      • Inter-AS MPLS
    • Security >
      • IOS Firewall
      • ASA Firewall
      • FirePOWER Threat Defense >
        • FTD - FTD NGFW Device Setup and FMC Integration
      • VPNs >
        • PKI
        • Site to Site VPNs
        • Remote Access VPNs >
          • IOS Remote Access
          • ASA Remote Access
    • Data Center >
      • Nexus 9000v >
        • Nexus 9000v - Enabling Features
        • Nexus 9000v - VLANs and Trunks
        • Nexus 9000v - LACP Port Channels
        • Nexus 9000v - vPC (Virtual Port Channel)
        • Nexus 9000v - OSPFv2
        • Nexus 9000v - VXLAN - Ingress Replication Flood and Learn
        • Nexus 9000v - IP Multicast
        • Nexus 9000v - VxLAN - Multicast Flood and Learn
        • Nexus 9000v - VxLAN - BGP EVPN with Multicast
        • Nexus 9000v - VxLAN - BGP EVPN w/Ingress Replication
        • Nexus 9000v - VxLAN - Inter-VxLAN Routing with BGP EVPN
        • Nexus 9000v - VXLAN - External Routing
      • Nexus 7000v
    • Palo Alto