Switches, Hubs, and Modems
cancel
Showing results for 
Search instead for 
Did you mean: 

ProCurve 6120XG and variable length subnets

ProCurve 6120XG and variable length subnets

Hi.

I'm trying to use variable length subnets on a ProCurve 6120XG in a BladeSystem c7000.

We have divided a Class C network up in to 8 subnets, 255.255.255.224. If I go back to a plain Class C it works but does not when using variable length subnets.

Does the 6120XG support variable length subnets?

Thanks!

J.J.
7 REPLIES
Lmm_1
Honored Contributor

Re: ProCurve 6120XG and variable length subnets

Are you assigning that IP address to an specific vlan or to the OOBM interface through the OA?
rick jones
Honored Contributor

Re: ProCurve 6120XG and variable length subnets

Given the 6120XG is a Layer-2 (Ethernet data-link) switch, apart from its management interface I don't see how it could care one way or another about how you subnetted the IP (Layer-3) address space used by the blades, all it is doing is switching Ethernet frames among the ports. Can you be a bit more specific about what you are trying to do and how?
there is no rest for the wicked yet the virtuous have no pillows
Pieter 't Hart
Honored Contributor

Re: ProCurve 6120XG and variable length subnets

Question: Are you using all 8 subnets within the same network / (V)LAN? (this is called a multinet)
Or are this seperate networks/VLAN's?

In both cases the switch can forward data between ports in the same subnet. This is a layer-2 (switching) communication and has nothing to do with TCP/IP adresses (layer-3).


In the multinet situation you should allready have a router to forward traffic between VLAN's/subnets, else the subnets are isolated and cannot talk to eachother.
If not then the only way to make the switch reachable from all subnets is to give it an adress+subnetmask that matches all subnets.

The normal way to set things up it to create separate VLAN's for each subnet and configure a router to forward traffic between VLAN's/subnets.

As the previous poster mentioned this is a L2 switch you will need an additional router to forward traffic between subnets.

Re: ProCurve 6120XG and variable length subnets

Yes, I have a VLAN for each subnet. Here is my show config:

hostname "net1001.mckesson.com"
interface 23
disable
lacp Active
exit
interface 24
disable
lacp Active
exit
trunk 18-19 Trk1 Trunk
ip default-gateway 10.97.221.62
vlan 1
name "DEFAULT_VLAN"
untagged 1-17,20-24,Trk1
no ip address
exit
vlan 131
name "Citrix_Console"
ip address 10.97.221.61 255.255.255.224
tagged 1-17,20-24,Trk1
exit
vlan 132
name "Citrix_McKHost"
tagged 1-17
no ip address
exit
vlan 133
name "Citrix_D9H11"
tagged 1-17
no ip address
exit
vlan 134
name "Citrix_Customer"
tagged 1-17
no ip address
exit
vlan 135
name "Citrix_Open1"
tagged 1-17
no ip address
exit
vlan 136
name "Citrix_open2"
tagged 1-17
no ip address
exit
vlan 137
name "Citrix_AD_DC"
tagged 1-17
no ip address
exit
vlan 130
name "MGMT"
tagged 1-17,20-24,Trk1
no ip address
exit
vlan 220
name "VLAN220"
tagged 1-17,20-24,Trk1
no ip address
exit
Pieter 't Hart
Honored Contributor

Re: ProCurve 6120XG and variable length subnets

can you specify "If I go back to a plain Class C it works but does not when using variable length subnets"
what does work, what doesn't?
- can the switch ping this gateway and vice-versa?
- can the switch telnet to this gateway (vv)?

>>>
ip default-gateway 10.97.221.62
vlan 131
ip address 10.97.221.61 255.255.255.224
tagged 1-17,20-24,Trk1
<<<
looks basically allright

- what is this default gateway?
- on which port is it connected
(possibly somewhere at Trk1?)
- what's the subnet mask on this gateway?
- what's the vlan config of this gateway?

Re: ProCurve 6120XG and variable length subnets

Hey guys.

Thanks for the help. We found the issue.
My network guy forgot to put the Layer-2 switch in the route of the up stream switch.

IT (Layer 2) --> Brocade TurboIron 24x (Layer 3)--> ProCurve

once he put that switch from our IT deptartment in there the subnets were able to forward and resolve eachother.

We're working on getting a Layer 2 switch in the lab so we won't have to go so far up to resolve.

Thanks again!

J.J.

Re: ProCurve 6120XG and variable length subnets

closing thread.