Re: Stacking 3750s and SGE2010 - can't establish connection

mega5llc1 · ‎05-13-2011

This is probably something very simple and I'm just missing the obvious, but i have been banging my head against a wall for days now and was hoping that there is someone out there that can shed some light on this.

I have an existing cascaded stack of 2 3750's for my server environment. I just purchased an SGE 2010 to replace my unmanaged Dell switch for the workstations. I have two goals, but the one related to this category is the primary and most important one.

GOAL: to integrate the SGE2010 with the 3750 stack so that the workstations can talk to the servers.

Workstation subnet being served up via DHCP from the 3750 to the current Dell switch to the workstations is 172.16.254.0/24. This is vlan 254 on the 3750.

I set the IPv4 IP address on the 2010 as 172.16.254.140 (an unused IP) and statically assigned a laptop with 172.16.254.141 and plugged it into port gi3 on the 2010. I set the default gateway and default route to point to 172.16.254.1 (the mgmt IP for the .254 subnet on the 3750 stack).

How do the ports on each switch need to be configured. I'm a little out of my element with the GUI interface on the 2010, but i've tried access and trunk mode - matching it with that setting on the 3750 port. Is encapsulation dot1q correct?

The stack ID on the 2010 is still showing as 1 after a reboot, and the 3750s hold their stack assignment just as before.

Just FYI - i have also enabled GVRP on the 2010 and that doesn't help. I do not require LAG or LACP configuration at this time.

Any help would be appreciated.

Kelly

3750 port plugged into 2010:

interface GigabitEthernet1/0/17
switchport access vlan 254
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 254
switchport mode trunk

If it would help I can post pics of the GUI i just wan't sure which screen would be needed as I believed that the description of the port configurations would be enough.

kapathak · ‎05-13-2011

Hi Scott,

Are the workstations on the 2010 able to ping their default gateway IP ?

Are you able to ping between the 2010 and the 3750 stack?

Is VLAN 254 the only VLAN present on the 2010?If yes, then the appropriate switchport config on gi1/0/17 would be either

switchport mode access

sw acc vlan 254

OR

switchport mode trunk

switchport trunk encap dot1q

switchport trunk allowed vlans 254

I am not too sure about the relevant commands on the 2010, but you would probably want to match them to the switchport config of gi1/0/17 on 3750

Also, the ports where workstations are connected on the 2010 should be access ports.

Cheers!

mega5llc1 · ‎05-13-2011

When i statically assign a workstation on the 2010 I am ablel to ping the 2010.

workstation: 172.16.254.141

2010 IPv4: 172.16.254.140

I am unable to ping any of the IP addresses (vlans) on the 3750 from the 2010 (host connected to the 2010)

There is only the default vlan1 on the 2010. I can create vlan 254 and put the gi1 port in that vlan, but the option to "tag" the traffic is not available and I wasn't sure if that was required.

Should the 2010 be in stacked mode or standalone mode?

Should it be configured to run as a layer 2 or a layer 3? (I assumed layer 3 but just checking)

It has a DHCP option...Should i just use that instead of trying to statically assign in the DHCP range the 3750 is serving to it's other clients?

Setting that option on the console though doesn't appear to give me the address that it's receiving - so i would need to statically assign it in order to configure a client on the same subnet and be able to manage it via the web GUI.

I just set the following on the 3750 port:

interface GigabitEthernet1/0/17
switchport access vlan 254
switchport mode access

I will try to match that on the 2010 now. I've reset to factory defaults and set for layer 3 standalone mode. I will see if default vlan settings work, and if not, go ahead and create vlan 254 on it and add the port.

Thanks for the response!

Scott

mega5llc1 · ‎05-13-2011