Preferred for controlling VLAN method captures on JOINT?

Hi all

We have recently added IDSM2s to our heart using VACL to capture traffic. How others control how VLANS can inspect the IDSMs? Now I put it in place where only some VLAN is mapped onto the VACL and allowed on the trunk. for example, VACL VLANs 1,2,3 card and enable the VLAN 1,2,3 on the trunk to the METHOD. Wouldn't be a bad idea to allow all the VLANS on the trunk and simply specify some VLAN on the VACL? Or vice versa, to map all the VLANS on the VACL and specify VLANS allowed on the trunk? All advice is appreciated.

Thank you

Ryan

There is no preferred, way certainly either works just as well.

I guess the issue I saw with leaving all VLANS on the trunk to the METHOD is that you actually get traffic broadcast and multicast on this trunk of VLAN that you aren't you capture VACL. Essentially of the broadcast and multicasts (and even without a CAM table entry associated with unicast MAC addresses) are transmitted in a switch on all ports in the VLAN, even of the trunks. If your VACL is followed only by VLAN 2 and 3, but the switch sees a show on VLAN 4 he passed on this trunk to the JOINT port because it is the nature of the transfer/flood package. For certain signatures (such as the sigs ARP-based), these same then leave alerts, so that you get alerts on VLAN 4, even if your VACL is specifying only VLAN 2 and 3. It doesn't happen very often, but it is important to be aware of this.

If you go and remove all the VLANS in the trunk JOINT except those who are in your VACL then you will not see these broadcasts/multicasts from other VIRTUAL networks. This is your current configuration through your description and will work well for you.

Tags: Cisco Security

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