The only way I know how to do that is place a router on VLAN 1.   Give it the IP of your default gateway (10.101.0.1) so everyone is now connecting to your router.   Change your ISA server IP to something different (10.101.0.2). Set up the default gateway on the router to the ISA server. Create a route on the router that any traffic destines to hit 10.101.1.0 255.255.255.0 to go to your VLAN 10.101.1.1 255.255.255.255 Then set up a route on that VLAN that any traffic trying to reach 10.101.0.0 255.255.255.0  to go to your router 10.101.0.1 255.255.255.255   That is the basic idea.  If you need a sample let me know.
The old building network is a collection of switches that are all Brand X on Vlan 1, which I cannot change. This is 10.101.x.x. The new building is all Dell PowerConnects including a 6224 (distribution/core), 5448s and 3548s. This is 10.102.x.xOn the 6224:1/g1 is connected to the old building1/g14 is connected to a 5448#1 which services vlan 104 (main data for the new building)1/g15 is connected to a 3548 which serves vlan 110 (VOIP phones) and vlan 104 (in case someone connects to the PC port on the phone)1/g20 is connected to a 5448#2 which provides a extension of the old building network into the new building (ie plug in to this switch to access all old building systems, dhcp, web, etc)1/xg3 is the main server which has DHCP.So far:I can get dhcp for Vlan 104 and 110 on both 5448#1 and the 3548. A vlan 104 pc on #1 can ping a vlan 110 PC on the 3548.  However, neither can ping any resources on the 10.101.x.x network - either in the old building or on 5448 #2. The 6224 can ping 10.101.x.x resources in the old building and the 5448#2 as well as everything on the 5448#1 and 3548. How can I get the new network (vlan 104 specifically) to see the old building network - including 5448 #2??? Here are the relevant sections of the running-config: 6224 !Current Configuration:!System Description "Powerconnect 6224F, 3.2.0.7, VxWorks 6.5"!System Software Version 3.2.0.7configurevlan databasevlan 103-104,110,112,199vlan routing 1 1vlan routing 104 2vlan routing 110 3exitstackmember 1 3exitip address 10.102.0.1 255.255.255.0! management vlanip address vlan 199 ip routing! dhcp in old building! since interconnected, need to make sure old network! does not route to new network dhcpip helper-address 10.101.0.10 dhcp ! old buildinginterface vlan 1routing! ip on management vlanip address 10.101.0.20 255.255.0.0exitinterface vlan 104name "DATA"routingip address 10.102.4.254 255.255.252.0! no need for dhcp helper since dhcp server on 104exitinterface vlan 110name "PHONE"routingip address 10.102.10.254 255.255.255.0ip helper-address 10.102.4.200 dhcpexit!! link to 5448#1interface ethernet 1/g14 switchport mode trunkswitchport trunk allowed vlan add 1,104,110,199exit!! link to 3548interface ethernet 1/g15switchport mode trunkswitchport trunk allowed vlan add 1,104,110,199exit!! test portinterface ethernet 1/g24switchport access vlan 104exit!! main server with dhcp at 10.102.4.200!interface ethernet 1/xg3spanning-tree portfastswitchport access vlan 104exit 5448 #1 interface range ethernet g(2-46)spanning-tree portfastexit ! link to 6224 1/g14 interface ethernet g48switchport mode trunkexitvlan databasevlan 104,110,199exitinterface range ethernet g(2-46)switchport access vlan 104exitinterface ethernet g48switchport trunk allowed vlan add 104exitinterface ethernet g48switchport trunk allowed vlan add 110exit interface ethernet g48switchport trunk allowed vlan add 199exit! management port interface ethernet g1switchport access vlan 199exit ! management ip interface vlan 199ip address 10.102.0.10 255.255.255.0 exit ! 6224 is 10.102.0.1 ip default-gateway 10.102.0.1 5448 #2 ! 5448 VLAN 1 07/14Binterface ethernet g48switchport mode generalexitvlan databasevlan 104exit interface vlan 1ip address 10.101.8.210 255.255.0.0 exitip default-gateway 10.101.0.20 Brand X in old building (everything access mode vlan 1) Thanks!!!
Connect Building A network to Building B network thru 6224 not working