Category: Nexus

Creating a SPAN session on a Nexus 9K

Create SPAN session
=================================
9kswitch# conf t
9kswitch(config)# monitor session 1

Configure destination port (destination cannot be a FEX port or a Port-channel!)
=================================
9kswitch# conf t
9kswitch(config)# interface eth 1/15
9kswitch(config-if)# switchport monitor
9kswitch(config-if)# exit
9kswitch(config)# monitor session 1
9kswitch(config-monitor)# destination interface eth 1/15

Configure source port (or VLAN)
=================================
9kswitch(config-monitor)# source interface eth 1/10
9kswitch(config-monitor)# source interface eth 1/11
or
9kswitch(config-monitor)# source vlan x

Activate a SPAN session
==================================
9kswitch(config)# no monitor session 1 shut

Display SPAN session
==================================
9kswitch# show monitor
or
9kswitch# show monitor session 1

conf t
monitor session 1
exit
int eth 1/15
switchport monitor
exit
monitor session 1
destination int eth 1/15
source int eth 1/10
source int eth 1/11
exit
no monitor session 1 shut

Cisco Nexus 9000: Configuring SPAN

VXLAN Packet Forwarding Flow

Some cut and paste info on how VXLAN works, more of a memory jogger and useful.

VXLAN uses stateless tunnels between VTEPs to transmit traffic of the overlay Layer 2 network through the Layer 3 transport network. The below is an example of a VXLAN packet forwarding taken from the Cisco VXLAN configuration guide for Nexus 9000 NS-OX

VXLAN-Overview

VXLAN Overview

Nexus 9k Configuration Guide

Configuring VXLAN BGP EVPN

I’m looking forward to setting up a Nexus 9k Solution, L3 using VXLAN BGP EVPN Topology Dual DataCentre configuration. Aiming for a Live/Live Core between the two. Only caveat is we will stick to L2 supporting the Edge, for Internet and IPWAN connections using traditional technologies such as HSRP.

VXLAN BGP EVPN…..Configuration guide