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6513 SPAN ports or capture ports?

I posted this in the IDS forum, but didn't quite get an answer that made sense, I'm hoping in the switch forum this might make a little more sense.

We currently have Cat6513 switches installed and our looking into an IDSM-2 module, but for the time being until we can actually purchase them, I would like to install a few snort sensor into the switch to "monitor" a few VLANs.

I've read where there are only two SPAN ports and to gain some type of correlation to the events, I figure I would need to install a separate snort sensor for each vlan. The problem is the limit of two SPAN ports. I heard that there is a way to utilize a "capture" feature on the 65xx systems.

Is the appropriate way for this to use the "capture" commands and if so how would I do that?

Also, I read where the SPAN ports have no performance impact on the switch, but would the "capture" commands?

I apologize if this is the wrong forum for this but I wasn't sure if this would be more of a switching or IDS question...

Thanks for any assistance!



Re: 6513 SPAN ports or capture ports?


yes there is the capture solution for ur case, it appropriate or not ?????

one beautifull thing that it overcome the session number limit,how u configure it think or do a research using the key word VSPAN,the idea here

1-you limit the traffic you want to capture by an access-list :

#acces-list 105 xxxxxxxxx

2-you define your vlan access-map

(config)#vlan access-map test

3-you match your traffic

(config-access-map)#match ip address 105

4-set the action to forward caption

(config-access-map)#action forward capture


5-define a filter

(config)#vlan filter test vlan-list 55 (for example we took her the vlan 55)

6- go to the port where your sensor is pluged


(config-if)#switchport capture allowed vlan 55

(config-if)#switchport capture

and you will get your traffic

about performance as u know ACL consume CPU cycles since you are using a high end switch certainly those ACL are in the tenary table in hardware so performance i thins does not matter


do rate if so


Re: 6513 SPAN ports or capture ports?

hi my friend did you test the post ????

let s us know

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