After Turning off spanning-tree on the 2848, this all works now. VLANS, trunking everything else.  Thanks for the help! :)    I hope if someone else can use this as it took me ages to work out.I plugged into Netgear switches etc and they seemed to work. The issue was going between the dell 6248 and 2848, Spanning tree is enabled on the 2848 by default. If I was going to the Netgear via the 6248 and then to the 2848 the switches were working. My config on the l3 works fine too if someone would like to use it :) 
Hi, I have a Powerconnect 6248 connected to a 2848 and I am trying to get VLANS working on the 2848. VLANS work and receive DHCP addresses, traffic routes correctly and DNS works on the 6248. The DHCP, DNS server is connected to port 1 on the 6248.   When I create a Trunk port on Port 3 of the 6248, allow all VLANS through it, create a trunk on port 1 of the 2848 on VLAN10 and try plugging devices into it, they cannot see any other devices connected to the L3 switch.    Both switches are running the latest firmware and the L3 on its own works as expected. I cannot get any sort of trunking working to the L2 switch, tried with normal and crossover cables. Here is the config of the 6248 L3. The 2848 L2 switch has a blank canvas with VLAN 10 created on ports 1,2,3,4 with port 1 setup as the trunk port.   Any ideas pleeease? Anyone? This is driving me crazy.    ************************   !Current Configuration:!System Description "Powerconnect 6248, 3.2.0.7, VxWorks 6.5"!System Software Version 3.2.0.7!Cut-through mode is configured as disabled!configurevlan databasevlan 10,20,30vlan routing 10 1vlan routing 20 2vlan routing 30 3exitstackmember 1 2exitip address 192.168.0.1 255.255.255.0ip domain-name domainip name-server 192.168.1.10ip routinginterface vlan 10routingip address 192.168.1.1 255.255.255.0exitinterface vlan 20routingip address 192.168.20.1 255.255.255.0ip helper-address 192.168.1.10exitinterface vlan 30routingip address 192.168.30.1 255.255.255.0ip helper-address 192.168.1.10exitusername "administrator" password 5f4dcc3b5aa765d61d8327deb882cf99 level 15 encrypteddhcp l2relaydhcp l2relay vlan 10-90!interface ethernet 1/g1switchport mode generalswitchport general pvid 10no switchport general acceptable-frame-type tagged-onlyswitchport general allowed vlan add 10,20,30exit!interface ethernet 1/g2switchport mode generalswitchport general pvid 10no switchport general acceptable-frame-type tagged-onlyswitchport general allowed vlan add 10exit!interface ethernet 1/g3switchport mode trunkswitchport trunk allowed vlan add 10,20exit!interface ethernet 1/g4switchport mode generalswitchport general pvid 10no switchport general acceptable-frame-type tagged-onlyswitchport general allowed vlan add 10exit!interface ethernet 1/g5switchport mode generalswitchport general pvid 10no switchport general acceptable-frame-type tagged-onlyswitchport general allowed vlan add 10exit!interface ethernet 1/g6switchport mode generalswitchport general pvid 20no switchport general acceptable-frame-type tagged-onlyswitchport general allowed vlan add 20exit!interface ethernet 1/g7switchport mode generalswitchport general pvid 20no switchport general acceptable-frame-type tagged-onlyswitchport general allowed vlan add 20exit!interface ethernet 1/g8switchport mode generalswitchport general pvid 20no switchport general acceptable-frame-type tagged-onlyswitchport general allowed vlan add 20exit!interface ethernet 1/g9switchport mode generalswitchport general pvid 30no switchport general acceptable-frame-type tagged-onlyswitchport general allowed vlan add 30exit!interface ethernet 1/g10switchport mode generalswitchport general pvid 30no switchport general acceptable-frame-type tagged-onlyswitchport general allowed vlan add 30exit
VLAN Trunking between 6248 and 2848