HP 2920 with layer 3 vlans

Posted on 2013-12-22
Last Modified: 2013-12-23
Dear Experts,

I have to configure a switch system to my company which is consist of two HP switches 2920 stacked to each other represent a core switch and six HP switches 1910 for each floor and a firewall for internet access, I want to do the following:

First configure a 12 VLANs on all the switches all vlans must not communicate with each others except the servers vlan can communicate with all the vlans using layer 3 routing.

Second all vlans must have internet connection via the connected firewall.

Third trunk connection using dynamic LACP one up-link to each 2920 switch for high availability.

Question by:husseinhammoud
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LVL 46

Accepted Solution

Craig Beck earned 500 total points
ID: 39734854
Well the config depends on how the switches at the core actually stack.  Will you be using the dedicated stacking module in each 2920, or will you be linking them together via the existing RJ45 ports or SFPs?
LVL 10

Expert Comment

ID: 39735009
You would use access control lists to protect your VLANs.  Here's a sample config I made up.  I don't have access to a switch to ensure that my syntax is all correct but hopefully you can understand the concepts.  Like Craigbeck mentioned above, not sure how you are stacking the switches but it is really simple to enable dynamic LACP.  It's just "interface 23-24 lacp active" for example to enable port 23 and 24 for lacp.  You only need to do it on one side as typically all the ports are set for passive by default.

max-vlans 100
ip routing
ip access-list standard "VLANs-Servers"
   1 remark "Servers Subnet"
   2 permit
ip access-list standard "VLANs-Out"
   1 remark "All Subnets"
   2 permit
interface 1
   name "1910SwitchFloor1"       
interface 2
   name "1910SwitchFloor2"
interface 3
   name "1910SwitchFloor3"
interface 4
   name "1910SwitchFloor4"
interface 5
   name "1910SwitchFloor5"
interface 6
   name "1910SwitchFloor6"
interface 7
   name "Server"
interface 8
   name "Firewall"
vlan 1
   name "DEFAULT_VLAN"
   untagged 8-24
   no untagged 1-7
vlan 100
   name "Server VLAN"
   ip address
   untagged 7-8
   tagged 1-6
vlan 2
   name "VLAN2"
   ip address
   tagged 1-6
   ip access-group VLANs-Servers in
   ip access-group VLANs-Out out
vlan 3
   name "VLAN3"
   ip address
   ip access-group VLANs-Servers in
   ip access-group VLANs-Out out
   tagged 1-6
vlan 4
{continue as above for rest of vlans}
LVL 46

Expert Comment

by:Craig Beck
ID: 39735016
Third trunk connection using dynamic LACP one up-link to each 2920 switch for high availability.
Just bear in mind that if you stack using SFPs (uplinks) not stack modules, you can't do this, even with the great example above.

You would have to use STP and no trunk for this.  This is really why it's important to know how you intend to make the stack.
LVL 10

Expert Comment

ID: 39736477
If my example was useful to you and correct, I would appreciate some points awarded to my solution.  If not, I can help you with the configuration to get it working.

LVL 46

Expert Comment

by:Craig Beck
ID: 39736494
@convergint - I agree.  If anything, your comment was actually a more complete solution and would likely do what the OP is asking.

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