Today I’d like to take a look at the founders of the NetFlow protocol, Cisco, and their Nexus 9k configuration. Similar to blogs in the past, it’s worth mentioning the Nexus 9000 supports sFlow.
Does Nexus support NAT?
The Cisco Nexus device supports NAT on the following interface types: ◦Switch Virtual Interfaces (SVIs) ◦Routed ports ◦Layer 3 port channels and subinterface ◦Layer 3 and Layer 3 subinterfaces. NAT is supported on the default Virtual Routing and Forwarding (VRF) table only.
How ERSPAN works?
ERSPAN is an acronym that stands for encapsulated remote switched port analyzer. ERSPAN mirrors traffic on one or more “source” ports and delivers the mirrored traffic to one or more “destination” ports on another switch.
What is sFlow vs NetFlow?
SFlow is a pure packet sampling technology. The most notable difference of SFlow vs NetFlow is that SFlow is network layer independent and has the ability to sample everything and to access traffic from OSI layer 2-7, while NetFlow is restricted to IP traffic only.
What is sFlow Cisco?
Sampled flow (sFlow) allows you to monitor real-time traffic in data networks containing switches and routers. It uses the sampling mechanism in the sFlow agent software on switches to monitor traffic and to forward the sample data to the central data collector. The core sFlow agent workflow goes as follows: 1.
What is the difference between Nexus 7k and 9k?
There are a few key differences between the Cisco Nexus 7000 Series and Nexus 9000 DC switches. The Nexus 9000 supports Application Centric Infrastructure (ACI) in contrast to the Nexus 7000 switches. Finally, it is foreseen that the Nexus 9000 will complement the Nexus 7000 as data centers transition to ACI.
What is Rspan port?
The Remote Switched Port Analyzer (RSPAN) enables you to monitor traffic on one switch through a device on another switch and then send the monitored traffic to one or more destinations.
How do you set up a Rspan?
Configuring RSPAN
- On the source device, enter the configure terminal command to access global configuration mode.
- Enter the rspan-vlan command, specifying a VLAN ID, to define an RSPAN VLAN on the source device.
- Enter the tagged ethernet command, specifying an interface, to add a member port.
How can I use RSPAN with the Nexus 7000 series switch?
In order to extend SPAN, RSPAN enables remote monitoring of multiple switches across your network. The Nexus 7000 Series Switch is limited in what it can do with RSPAN. An RSPAN VLAN cannot be used as a SPAN destination. Therefore, the Nexus 7000 switch can only use RSPAN as a transit VLAN or a source VLAN and pull data from the RSPAN VLAN.
How is RSPAN traffic transferred from Nexus 1 to Nexus 2?
From the Nexus 1 switch, the SPAN traffic from the source is carried to the destination port and copied onto the RSPAN VLAN. The traffic is then forwarded over the link to the Nexus 2 switch on the Ethernet 1/1 interface.
Does n9k support RSPAN?
I have read that N9K doesn’t support RSPAN but I see at my boxes that the vlan 666 is a remote span. What is more interesting that is working fine however I don’t know how vlan 666 was defined.
How to use Switched Port Analyzer (span) with RSPAN?
You can use switched port analyzer (SPAN) in order to analyze network traffic that passes through ports or VLANs of the switch, which send a copy of the traffic to a destination port where the network analyzer connects to the switch. In order to extend SPAN, RSPAN enables remote monitoring of multiple switches across your network.
