Nexus 9k span

4evarighteous · ‎12-14-2018

Hi, I want to configure span/mirror ports on a Cisco 9k switch to monitor traffic in both egress and ingress direction as the source. If done by vlan, it only support ingress direction as the source. How can mirroring be done to monitor both ingress and egress traffic.

thanks

luis_cordova · ‎12-14-2018

Hello @4evarighteous,

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/system_management/configuration/guide/b_Cisco_Nexus_9000_Series_NX-OS_System_Management_Configuration_Guide_7x/b_Cisco_Nexus_9000_Series_NX-OS_System_Management_Configuration_...

I found this in some notes of this link:

SPAN Sources

The interfaces from which traffic can be monitored are called SPAN sources. Sources designate the traffic to monitor and whether to copy ingress (Rx), egress (Tx), or both directions of traffic.

Note: When you specify the supervisor inband interface as a SPAN source, the device monitors all packets that are sent by the Supervisor CPU.

Note: When you specify a VLAN as a SPAN source, all supported interfaces in the VLAN are SPAN sources.

Note: VLANs can be SPAN sources only in the ingress direction.

Note: Cisco Nexus 9300 and 9500 platform switches (excluding the Cisco Nexus 9300-EX switches) support FEX ports as SPAN sources in the ingress direction for all traffic and in the egress direction only for known Layer 2 unicast traffic flows through the switch and FEX. Routed traffic might not be seen on FEX HIF egress SPAN. Cisco Nexus 9300-EX platform switches support FEX ports as SPAN sources only in the ingress direction.

Regards