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Cisco 7000 Span Port

Posted on 2011-09-20
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Last Modified: 2012-05-12
Hi all,
I have a question regarding Spanports on a Cisco 7000. How many ports can be used for this purpose?  

Thanks.
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Question by:NYGiantsFan
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by:jmeggers
ID: 36569457
You're talking about the Nexus 7000, I assume.  Still limited to two concurrently active, but you can have up to 48 sessions configured, most will be shutdown.

See  http://www.cisco.com/en/US/products/ps9402/products_configuration_example09186a0080b8253b.shtml
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by:NYGiantsFan
ID: 36573605
Yes, Nexus 7000.  Sorry, I am not a switch/Cisco person.  Are you saying that we can have two ports spanning.  What do you mean 48 sessions configured?

The problem I am trying solve is when I attempt to send all traffic through a spanport and the spanport is dropping packets.

I am wondering if it would be possible to send 1/2 of the traffic to one port and 1/2 of the traffic to another spanport?  Thanks.



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jmeggers earned 500 total points
ID: 36574007
When you configure SPAN on a regular IOS switch, it's typically like:

monitor session 1 source VLAN 10
monitor session 1 destination interface fastethernet 0/48

I sent you the link to the Nexus SPAN documentation.  On the Nexus you can configure up to 48 of these monitoring sessions, but the syntax is different:

Destination port configuration:

interface ethernet 3/48
 switchport
 switchport monitor
 no shut

Session configuration:

monitor session 1
 source interface ethernet 3/11 both
 destination interface ethernet 3/48
 no shut

The "no shut" command can also be a "shut" command to disable the session.  So out of the 48 sessions you can configure, only two of them can be active at any one time.

I don't know of any way you can split the traffic.  It's not surprising on a switch with the kind of throughput capability as the N7k you might run into interface limitations.  What kind of interface are you using as your destination?  Is a faster one available?
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