06-02-2009 09:22 AM - edited 03-06-2019 06:03 AM
Hello,
the product description of the Catalyst 3560 says that this switch Multilayer switches can look deeper into the frame => intelligent decisions
based on Layer 3 or Layer 4 information.
So is it possible to create VLANs based on Layer 3 dynamic by the IP Adress instead of the MAC Adress?
Greetings from Germany!
06-02-2009 11:11 AM
No, because TCP/IP is a stack, you can't read L3 info if L2 doesn't exist (VLAN not created)
06-02-2009 11:30 AM
Somewhere I read:
'The Network Address Based VLAN links subnets according to the source IP address of the datagrams. This type of solution provides great flexibility insofar as the configuration of the switches changes automatically when a station is moved. On the other hand there may be slight degradation in performance since the information contained in the packets must be analysed more closely. '
So, this is wrong? Or do I need something special to configure this function?
06-02-2009 12:53 PM
I think you are referring to protocol based vlans here. Please see the link below :
http://en.wikipedia.org/wiki/VLAN
If yes, then Cisco switches doesnot support protocol based vlans.
HTH
06-02-2009 12:59 PM
Yes, that's right.
Is there any reason, why they don't support protocol based vlans?
So I have to use the Dynamic VLAN based on the MAC address?
06-02-2009 01:50 PM
May be because it might use more resources from the switch.
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