06-22-2010 07:12 AM - edited 03-06-2019 11:41 AM
Hello,
I have 4 x 3750 switches that are trunk together, ther are a few VLAN's and on VLAN 10 I have a DHCP server that issues out IP's to VLAN 10, but I now need to use this server to issue IP's to PC that are on VLAN 20 and 30, how can I do this?
I am using EIGRP routing on the 4 switches so all the VLAN's can route to each other.
Thanks
06-22-2010 07:19 AM
setup ip helper-address on vlans 20 & 30.
Francisco
06-22-2010 07:21 AM
Thanks, out of interest what is the best way to route between vlans on L3 switches, and should the users gateway normally be the IP of there VLAN?
06-22-2010 07:27 AM
yes.
users should use their vlan SVI as their local default gateway to route to another vlan.
Francisco.
06-22-2010 07:22 AM
Hi Andy
Do u have L3 SVI for your VLAN on ur switch ??? , If u have defined all 3 VLAN as L3 SVI in ur Switch then only give ip helper address comand under interface vlan 20 & 30 ,
eg :
Interface vlan 10
ip address 192.168.1.1 255.255.255.0
Interface vlan 20
ip address 192.168.2.1 255.255.255.0
ip helper address 192.168.1.10
Interface vlan 30
ip address 192.168.3.1 255.255.255.0
ip helper address 192.168.1.10
Condition all switches connect Via trunk port should permit VLAN 10 , 20 ,30 ...
06-22-2010 07:26 AM
How would I configure SVI's so all VLAN's can route between each other?
Should the gateway of the PC's be the VLAN IP?
Thanks
06-22-2010 07:30 AM
06-22-2010 07:33 AM
Andy ,
while u define ur default router in ur DHCP scope u can point to interface of L3 SVI interface
for eg : default router : 192.1681.1 for vlan 10
default router : 192.168.2.1 for vlan 20
default router : 192.168.3.1 for vlan 20
that will carry traffic to SVI interface , then it will use ur routing table for ur l3 switch packet exit ...
HTH
santhosh
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