Configuring VXLAN Flood and Learn on Nexus 7K

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Updated:October 10, 2016
Document ID:200269

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Introduction

This document describes the configuration of Virtual Extensible LAN (VXLAN) Flood and Learn on Nexus 7000 series switches.

Prerequisites

Requirements

Cisco recommends that you have knowledge of these topics:

  • Multicast routing concepts such as Rendezvous Point (RP) and Platform Independent Multicast (PIM).
  • VXLAN concepts

Note: This document assumes that the IP routing and multicast routing has been established prior to VXLAN configuration.

Components Used

The information in this document is based on these software and hardware versions:

  • N77-C7710
  • N77-F348XP-23
  • N77-F324FQ-25

Note: N77K is running software release 7.2(0)D1(1).

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

Configure

Network Diagram

Configurations

These configurations are specific to the VXLAN portion of configuration. These configurations assume full reachability to all L3 interfaces in the topology with the routing protocol of your choice. Static routing is used in this example. It also assumes that multicast routing has been established over these same L3 interfaces

VTEP-1

feature pim
system bridge-domain 50,75
feature nv overlay
feature interface-vlan

feature vni
vni 5000
vni 7500

ip route 10.10.10.2/32 Ethernet10/1 192.168.1.2
ip pim rp-address 192.168.1.1 group-list 224.0.0.0/4

bridge-domain 50
bridge-domain 75

encapsulation profile vni VSI_50_TO_5000
  dot1q 50  vni 5000
encapsulation profile vni VSI_75_TO_7500
    dot1q 75  vni 7500
bridge-domain 50
  member vni 5000
bridge-domain 75
  member vni 7500

interface nve1
  no shutdown
  source-interface loopback10
  member vni 5000 mcast-group 225.1.1.1
  member vni 7500 mcast-group 227.1.1.1

interface Bdi50
   no shutdown
   ip address 10.50.50.50/24

interface Bdi75
   no shutdown
   ip address 10.75.75.75/24

interface Ethernet7/17
  no switchport
  no shutdown
  service instance 1 vni
    no shutdown
    encapsulation profile VSI_50_TO_5000  default
  service instance 2 vni
    no shutdown
    encapsulation profile VSI_75_TO_7500 default

interface Ethernet10/1
  no switchport
  ip address 192.168.1.1/30
  ip pim sparse-mode
  no shutdown

interface loopback10
  ip address 10.10.10.1/32
  ip pim sparse-mode

It is important to note that the internal interface on the VTEP (Vxlan Tunnel endpoint) is configured as a Layer 3 port (no switchport). However, there is no IP assigned to it. It is also important to note that the BD value defined on the VTEP does not have to match the vlan ID which is used to send traffic into this device. However, the dot1q to VNI(Vxlan Network Identifier) mapping defined in the encapsulation profile, which is called under the service instance on the internal interface, should match the Vlan ID.

VTEP-2

feature pim
system bridge-domain 50,75
feature nv overlay
feature interface-vlan

feature vni
vni 5000
vni 7500

ip route 10.10.10.1/32 Ethernet10/7 192.168.1.1
ip pim rp-address 192.168.1.1 group-list 224.0.0.0/4

bridge-domain 50
bridge-domain 75

encapsulation profile vni VSI_50_TO_5000
  dot1q 50  vni 5000
encapsulation profile vni VSI_75_TO_7500
    dot1q 75  vni 7500
bridge-domain 50
  member vni 5000
bridge-domain 75
  member vni 7500

interface nve1
  no shutdown
  source-interface loopback10
  member vni 5000 mcast-group 225.1.1.1
  member vni 7500 mcast-group 227.1.1.1

interface Bdi50
 no shutdown
 ip address 10.50.50.51/24

interface Bdi75
 no shutdown
 ip address 10.75.75.76/24

interface Ethernet7/30
  no switchport
  no shutdown
  service instance 1 vni
    no shutdown
    encapsulation profile VSI_50_TO_5000  default
  service instance 2 vni
    no shutdown
    encapsulation profile VSI_75_TO_7500 default

interface Ethernet10/7
  no switchport
  ip address 192.168.1.2/30
  ip pim sparse-mode
  no shutdown

interface loopback10
  ip address 10.10.10.2/32
  ip pim sparse-mode

It is important to note that the internal interface on the VTEP is configured as a Layer 3 port (no switchport). However, there is no IP assigned to it. It is also important to note that the BD value defined on the VTEP does not have to match the Vlan ID which is used to send traffic into this device. However, the dot1q to VNI mapping defined in the encapsulation profile, which is called under the service instance on the internal interface, should match the Vlan ID.

Verify

Use this section in order to confirm that your configuration works properly.

Example Outputs

These outputs are in a steady state. The VTEP peers have discovered each other and traffic has passed between both in the encap and decap directions.

VTEP-1

VTEP-1# show nve vni
Codes: CP - Control Plane        DP - Data Plane
       UC - Unconfigured         SA - Suppress ARP

Interface VNI      Multicast-group   State Mode Type [BD/VRF]      Flags
--------- -------- ----------------- ----- ---- ------------------ -----
nve1      5000     225.1.1.1         Up    DP   L2 [50]
nve1      7500     227.1.1.1         Up    DP   L2 [75]

VTEP-1# show running-config interface nve 1

interface nve1
  no shutdown
  source-interface loopback10
  member vni 5000 mcast-group 225.1.1.1
  member vni 7500 mcast-group 227.1.1.1

VTEP-1# show service instance vni detail

VSI: VSI-Ethernet7/17.1
If-index: 0x35310001
Admin Status: Up
Oper Status: Up
Auto-configuration Mode: No
encapsulation profile vni VSI_50_TO_5000
  dot1q 50 vni 5000
Dot1q   VNI     BD
------------------
50      5000    50

VSI: VSI-Ethernet7/17.2
If-index: 0x35310002
Admin Status: Up
Oper Status: Up
Auto-configuration Mode: No
encapsulation profile vni TEST
  dot1q 100 vni 7500
Dot1q   VNI     BD
------------------
100     7500    75

VTEP-1# show bridge-domain

Bridge-domain 50  (2 ports in all)
Name:: Bridge-Domain50
 Administrative State: UP               Operational State: UP
        VSI-Eth7/17.1
        vni5000
        nve1

Bridge-domain 75  (2 ports in all)
Name:: Bridge-Domain75
 Administrative State: UP               Operational State: UP
        VSI-Eth7/17.2
        vni7500
        nve1

VTEP-1# show mac address-table dynamic
 Note: MAC table entries displayed are getting read from software.
 Use the 'hardware-age' keyword to get information related to 'Age'

 Legend:
        * - primary entry, G - Gateway MAC, (R) - Routed MAC, O - Overlay MAC
        age - seconds since last seen,+ - primary entry using vPC Peer-Link, E -
 EVPN entry
        (T) - True, (F) - False ,  ~~~ - use 'hardware-age' keyword to retrieve
age info
  VLAN/BD   MAC Address      Type      age     Secure NTFY Ports/SWID.SSID.LID
---------+-----------------+--------+---------+------+----+------------------
* 50       547f.eeec.af43    dynamic     ~~~      F    F  nve1/10.10.10.2
* 50       547f.eeec.af44    dynamic     ~~~      F    F  VSI-Eth7/17.1
* 50       547f.eeec.af45    dynamic     ~~~      F    F  nve1/10.10.10.2
* 75       547f.eeec.af44    dynamic     ~~~      F    F  VSI-Eth7/17.2
* 75       547f.eeec.af45    dynamic     ~~~      F    F  nve1/10.10.10.2

VTEP-1# show ip mroute detail
IP Multicast Routing Table for VRF "default"

Total number of routes: 7
Total number of (*,G) routes: 2
Total number of (S,G) routes: 4
Total number of (*,G-prefix) routes: 1

(*, 225.1.1.1/32), uptime: 19:51:28, nve(1) ip(0) pim(1)
  Data Created: No
  VXLAN Flags
    VXLAN Encap
  Stats: 0/0 [Packets/Bytes], 0.000   bps
  Incoming interface: Ethernet10/1, RPF nbr: 1.1.1.1
  Outgoing interface list: (count: 2)
    Ethernet10/1, uptime: 19:51:09, pim, (RPF)
    nve1, uptime: 19:51:28, nve

(10.10.10.1/32, 225.1.1.1/32), uptime: 19:51:28, nve(0) mrib(0) ip(0) pim(1)
  Data Created: No
  Received Register stop
  VXLAN Flags
    VXLAN Encap
  Stats: 19/2274 [Packets/Bytes], 0.000   bps
  Incoming interface: loopback10, RPF nbr: 10.10.10.1, internal
  Outgoing interface list: (count: 1)
    Ethernet10/1, uptime: 19:51:09, pim

(10.10.10.2/32, 225.1.1.1/32), uptime: 18:10:06, pim(1) mrib(1) ip(0)
  Data Created: Yes
  VXLAN Flags
    VXLAN Decap
  Stats: 9/846 [Packets/Bytes], 0.000   bps
  Incoming interface: Ethernet10/1, RPF nbr: 1.1.1.2, internal
  Outgoing interface list: (count: 2)
    Ethernet10/1, uptime: 01:00:32, pim, (RPF)
    nve1, uptime: 18:10:06, mrib

(*, 227.1.1.1/32), uptime: 12:52:13, nve(1) ip(0) pim(1)
  Data Created: No
  VXLAN Flags
    VXLAN Encap
  Stats: 0/0 [Packets/Bytes], 0.000   bps
  Incoming interface: Ethernet10/1, RPF nbr: 1.1.1.1
  Outgoing interface list: (count: 2)
    Ethernet10/1, uptime: 12:51:52, pim, (RPF)
    nve1, uptime: 12:52:13, nve

(10.10.10.1/32, 227.1.1.1/32), uptime: 12:52:13, nve(0) mrib(0) ip(0) pim(1)
  Data Created: No
  Received Register stop
  VXLAN Flags
    VXLAN Encap
  Stats: 300/39850 [Packets/Bytes], 0.000   bps
  Incoming interface: loopback10, RPF nbr: 10.10.10.1, internal
  Outgoing interface list: (count: 1)
    Ethernet10/1, uptime: 12:51:52, pim

(10.10.10.2/32, 227.1.1.1/32), uptime: 12:51:34, pim(1) mrib(1) ip(0)
  Data Created: Yes
  VXLAN Flags
    VXLAN Decap
  Stats: 22/1928 [Packets/Bytes], 0.000   bps
  Incoming interface: Ethernet10/1, RPF nbr: 1.1.1.2, internal
  Outgoing interface list: (count: 2)
    Ethernet10/1, uptime: 00:52:14, pim, (RPF)
    nve1, uptime: 12:51:34, mrib

(*, 232.0.0.0/8), uptime: 20:56:33, pim(0) ip(0)
  Data Created: No
  Stats: 0/0 [Packets/Bytes], 0.000   bps
  Incoming interface: Null, RPF nbr: 0.0.0.0
  Outgoing interface list: (count: 0)

VTEP-1# show ip arp

Flags: * - Adjacencies learnt on non-active FHRP router
       + - Adjacencies synced via CFSoE
       # - Adjacencies Throttled for Glean
       D - Static Adjacencies attached to down interface

IP ARP Table for context default
Total number of entries: 4
Address         Age       MAC Address     Interface
10.50.50.1      00:11:32  547f.eeec.af44  Bdi50
10.50.50.2      00:11:14  547f.eeec.af44  Bdi50
10.75.75.1      00:10:45  547f.eeec.af44  Bdi75
10.75.75.2      00:15:04  547f.eeec.af45  Bdi75
192.168.1.2     00:05:39  547f.eeec.af43  Ethernet10/1

VTEP-1# show ip route
IP Route Table for VRF "default"
'*' denotes best ucast next-hop
'**' denotes best mcast next-hop
'[x/y]' denotes [preference/metric]
'%<string>' in via output denotes VRF <string>

192.168.1.0/30, ubest/mbest: 1/0, attached
    *via 1.1.1.1, Eth10/1, [0/0], 20:25:13, direct
192.168.1.1/32, ubest/mbest: 1/0, attached
    *via 1.1.1.1, Eth10/1, [0/0], 20:25:13, local
10.10.10.1/32, ubest/mbest: 2/0, attached
    *via 10.10.10.1, Lo10, [0/0], 20:25:45, local
    *via 10.10.10.1, Lo10, [0/0], 20:25:45, direct
10.10.10.2/32, ubest/mbest: 1/0
    *via 1.1.1.2, Eth10/1, [1/0], 20:23:42, static
50.50.50.0/24, ubest/mbest: 1/0, attached
    *via 50.50.50.50, Bdi50, [0/0], 01:18:47, direct
50.50.50.50/32, ubest/mbest: 1/0, attached
    *via 50.50.50.50, Bdi50, [0/0], 01:18:47, local
75.75.75.0/24, ubest/mbest: 1/0, attached
    *via 75.75.75.75, Bdi75, [0/0], 01:10:05, direct
75.75.75.75/32, ubest/mbest: 1/0, attached
    *via 75.75.75.75, Bdi75, [0/0], 01:10:05, local

Note: All of these outputs were gathered with a full mesh of traffic flowing between all hosts in the topology.

VTEP-2

VTEP-2# show nve vni
Codes: CP - Control Plane        DP - Data Plane
       UC - Unconfigured         SA - Suppress ARP

Interface VNI      Multicast-group   State Mode Type [BD/VRF]      Flags
--------- -------- ----------------- ----- ---- ------------------ -----
nve1      5000     225.1.1.1         Up    DP   L2 [50]
nve1      7500     227.1.1.1         Up    DP   L2 [75]

VTEP-2# show running-config interface nve 1

interface nve1
  no shutdown
  source-interface loopback10
  member vni 5000 mcast-group 225.1.1.1
  member vni 7500 mcast-group 227.1.1.1

VTEP-2# show service instance vni detail

VSI: VSI-Ethernet7/30.1
If-index: 0x3531d001
Admin Status: Up
Oper Status: Up
Auto-configuration Mode: No
encapsulation profile vni VSI_50_TO_5000
  dot1q 50 vni 5000
Dot1q   VNI     BD
------------------
50      5000    50

VSI: VSI-Ethernet7/30.2
If-index: 0x3531d002
Admin Status: Up
Oper Status: Up
Auto-configuration Mode: No
encapsulation profile vni TEST
  dot1q 100 vni 7500
Dot1q   VNI     BD
------------------
100     7500    75

VTEP-2# show bridge-domain

Bridge-domain 50  (2 ports in all)
Name:: Bridge-Domain50
 Administrative State: UP               Operational State: UP
        vni5000
        VSI-Eth7/30.1
        nve1

Bridge-domain 75  (2 ports in all)
Name:: Bridge-Domain75
 Administrative State: UP               Operational State: UP
        vni7500
        VSI-Eth7/30.2
        nve1

VTEP-2# show mac address-table dynamic
 Note: MAC table entries displayed are getting read from software.
 Use the 'hardware-age' keyword to get information related to 'Age'

 Legend:
        * - primary entry, G - Gateway MAC, (R) - Routed MAC, O - Overlay MAC
        age - seconds since last seen,+ - primary entry using vPC Peer-Link, E -
 EVPN entry
        (T) - True, (F) - False ,  ~~~ - use 'hardware-age' keyword to retrieve
age info
  VLAN/BD   MAC Address      Type      age     Secure NTFY Ports/SWID.SSID.LID
---------+-----------------+--------+---------+------+----+------------------
* 50       547f.eeec.af44    dynamic     ~~~      F    F  nve1/10.10.10.1
* 50       547f.eeec.af45    dynamic     ~~~      F    F  VSI-Eth7/30.1
* 75       547f.eeec.af45    dynamic     ~~~      F    F  VSI-Eth7/30.2
* 75       547f.eeec.af48    dynamic     ~~~      F    F  nve1/10.10.10.1

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

Total number of routes: 5
Total number of (*,G) routes: 2
Total number of (S,G) routes: 2
Total number of (*,G-prefix) routes: 1

(*, 225.1.1.1/32), uptime: 19:56:19, nve(1) ip(0) pim(0)
  Data Created: No
  VXLAN Flags
    VXLAN Encap
  Stats: 8/748 [Packets/Bytes], 0.000   bps
  Incoming interface: Ethernet10/7, RPF nbr: 1.1.1.1
  Outgoing interface list: (count: 1)
    nve1, uptime: 19:56:19, nve

(10.10.10.2/32, 225.1.1.1/32), uptime: 19:56:19, nve(0) mrib(0) pim(1) ip(0)
  Data Created: No
  Received Register stop
  VXLAN Flags
    VXLAN Encap
  Stats: 9/834 [Packets/Bytes], 0.000   bps
  Incoming interface: loopback10, RPF nbr: 10.10.10.2
  Outgoing interface list: (count: 1)
    Ethernet10/7, uptime: 18:15:17, pim

(*, 227.1.1.1/32), uptime: 12:57:03, nve(1) ip(0) pim(0)
  Data Created: No
  VXLAN Flags
    VXLAN Encap
  Stats: 10/864 [Packets/Bytes], 0.000   bps
  Incoming interface: Ethernet10/7, RPF nbr: 1.1.1.1
  Outgoing interface list: (count: 1)
    nve1, uptime: 12:57:03, nve

(10.10.10.2/32, 227.1.1.1/32), uptime: 12:57:03, nve(0) mrib(0) ip(0) pim(1)
  Data Created: No
  Received Register stop
  VXLAN Flags
    VXLAN Encap
  Stats: 30/2648 [Packets/Bytes], 0.000   bps
  Incoming interface: loopback10, RPF nbr: 10.10.10.2
  Outgoing interface list: (count: 1)
    Ethernet10/7, uptime: 12:56:45, pim

(*, 232.0.0.0/8), uptime: 18:20:36, pim(0) ip(0)
  Data Created: No
  Stats: 0/0 [Packets/Bytes], 0.000   bps
  Incoming interface: Null, RPF nbr: 0.0.0.0
  Outgoing interface list: (count: 0)

VTEP-2# show ip arp

Flags: * - Adjacencies learnt on non-active FHRP router
       + - Adjacencies synced via CFSoE
       # - Adjacencies Throttled for Glean
       D - Static Adjacencies attached to down interface

IP ARP Table for context default
Total number of entries: 4
Address         Age       MAC Address     Interface
10.50.50.1      00:11:30  547f.eeec.af44  Bdi50
10.50.50.2      00:17:07  547f.eeec.af45  Bdi50
10.75.75.1      00:04:14  547f.eeec.af45  Bdi75
10.75.75.2      00:03:24  547f.eeec.af45  Bdi75
192.168.1.1     00:10:52  547f.eeec.af48  Ethernet10/7

VTEP-2# show ip route
IP Route Table for VRF "default"
'*' denotes best ucast next-hop
'**' denotes best mcast next-hop
'[x/y]' denotes [preference/metric]
'%<string>' in via output denotes VRF <string>

192.168.1.0/30, ubest/mbest: 1/0, attached
    *via 1.1.1.2, Eth10/7, [0/0], 20:30:24, direct
192.168.1.2/32, ubest/mbest: 1/0, attached
    *via 1.1.1.2, Eth10/7, [0/0], 20:30:24, local
10.10.10.1/32, ubest/mbest: 1/0
    *via 1.1.1.1, Eth10/7, [1/0], 20:29:48, static
10.10.10.2/32, ubest/mbest: 2/0, attached
    *via 10.10.10.2, Lo10, [0/0], 20:29:39, local
    *via 10.10.10.2, Lo10, [0/0], 20:29:39, direct
50.50.50.0/24, ubest/mbest: 1/0, attached
    *via 50.50.50.51, Bdi50, [0/0], 01:22:50, direct
50.50.50.51/32, ubest/mbest: 1/0, attached
    *via 50.50.50.51, Bdi50, [0/0], 01:22:50, local
75.75.75.0/24, ubest/mbest: 1/0, attached
    *via 75.75.75.76, Bdi75, [0/0], 01:14:50, direct
75.75.75.76/32, ubest/mbest: 1/0, attached
    *via 75.75.75.76, Bdi75, [0/0], 01:14:50, local

Note: All of these outputs were gathered with a full mesh of traffic flowing between all hosts in the topology.

Troubleshoot

There is currently no specific troubleshooting information available for this configuration.

TAC Authored

Contributed by Cisco Engineers

  • Bob Hobensack
    Cisco TAC Engineer

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