NEXUS 7000 SERIES SWITCH ERSPAN CONFIGURATION EXAMPLE

This is a long standing feature enhancement request to allow for easier capturing of traffic for monitoring and analysis as ERSPAN allows you to statically place a network sniffer in the IP topology without having to relocate the sniffer to the local switch you want to monitor. You are commenting using your Twitter account. This site uses cookies. Hello How can i filter the capture with a specific MAC. He is known for his blog and cheat sheets here at Packet Life. With a simple capture filter setup in Wireshark you can limit your captured packets only to GRE packets.

Sniffer Linux server Linux machine was good choice because of the following reasons: In this case This is a Good Thing c. But I was wrong. In summary, you must set the mode or the destination port to monitor before you set it as a destination for the SPAN traffic. Things You Should Know 1—The session-number can be from 1 to The only problem as I see it is its limited deployment. But it gets better.

To enable deterministic behavior, explicitly suspend the sessions 3 to 10 with the monitor session session-number shut command. This allows network operators to strategically place their network monitoring gear in a central location of their network as they then can collect historical traffic patterns in great detail. Rick guest May 27, at 5: Lastly, start your capture. Nexus7K show monitor session 1 session 1 description: I want to send encapsulated erspan from two of the switches and 1 switch, to the other switchdo i need separate L3 link between the switches to do this or the vpc link and the peer link is sufficient to handle traffic load?

Siwtch traffic entering VLAN on the source switch will be replicated out this interface. To find out more, including how to control cookies, see here: But at the end it worked fine. Your email address will not be published. There are however some important caveats to pay attention to: Thanks Gary and Marco, this worked for me with a twist, I used the ether[offset: The only problem as I see it is its limited deployment.

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SPAN/ERSPAN setup

You can configure up to 18 sessions; however you can have only 2 sessions active at a time. It also works with the Cisco Nexus V. This is where my new favorite trick comes in. For example, if you configured ten sessions 1 to 10 where 1 and 2 are active, after a reboot, sessions 9 and 10 will be active. It also changes if there are IP options within the outer IP header. Nizar guest May 24, at 2: I can’t think of a work around Leave a Reply Cancel reply Your email address will not be published.

This is a long standing feature enhancement request to allow for easier capturing of traffic for monitoring and analysis as ERSPAN allows you to statically place a network sniffer in the IP topology without having to relocate the sniffer to the local switch you want to monitor.

Port Mirroring on a Cisco Nexus Switch – Know why and master how

The new generation of Cisco switches based on the Nexus platform have a slightly more complicated SPAN setup when compared to other Cisco switch platforms. Anybody should know that, if not, then check some documentation on internet.

You can reach him by email or follow him on Twitter. Can you tell me which switch model that have this problem? Nizar, lack of available ports might be the problem rather than the platform.

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Troubleshoot Cisco Switches Interface Drops.

This is a Good Thing c. Interface is a PC member. If you mirror traffic without a VLAN tag, you have to lower the numbers by 4. Email required Address never made public. Sniffer Linux server Linux machine was good choice because of the following reasons: Interface is a PC member Now before we move to configuration for switches nr. During startup, the order of active sessions is reversed; the last two sessions are active.

Notify me of new comments via email. More cool stuff networking-forum. Please use global mode. Leave a Reply Cancel reply Your email address will not be published. Wireshark is very smart. In this case Posted in net-mgmtnexus Tagged erspannexusnxos Leave a Comment. Nice info very useful for isp environment capturing. Rob M guest May 17, at 7: Which means with 5. Hi Jeremy, I want to send encapsulated erspan from two of the switches and 1 switch, to the other switchdo i need separate L3 link between the switches to do this or the vpc link and the peer link is sufficient to handle traffic load?

Barani guest September 12, at 1: If we try to configure it, the following error might appear: Example config below — in this topology: They can be enabled with the no shut command. So obviously the switch is not able to resolve the destination IP.