I have 3com 4500 switch , I have created 4 vlans , Vlan 1, Vlan2, Vlan 3, Vlan4 Vlan3 range should be from 10.88.120.0 to 10.88.120.127 subnet : 255.255.255.128 I created Vlan3 Interface as 10.88.120.126 Vlan 4 range should be 10.88.120.128 to 10.88.120.254Subnet : 255.255.255.128 I created Vlan4 interface as 10.88.120.254 once i created the interfaces it's added to the IP routing automatically . I made the default gate way for the hosts on vlan3 to 10.88.120.126 and the default gate way on vlan4 to 10.88.120.254 but till now i can't communicate betwwen the Vlan 3 and vlan4 . need your advice

SOURCE: two different subnet in same vlan how to creat HSRP

You can only create HSRP within the same domain or per vlan .For instance for vlan 20 the config will be as follows:
Primary side
interface vlan 20
ip address 192.168.1.1 255.255.255.0 secondary
ip address 192.168.2.1 255.255.252.0
standby 1 ip 192.168.1.2
standby 1 priority 105
standby 1 track[ interface name]
standby 1 preempt
standby 2 ip 192.168.2.2
standby 2 priority 105
standby 2 track ( put the the outgoing interface which this group will check incase it goes down i.e wan interface)

Backup configuration
interface vlan 20
ip address 192.168.1.3 255.255.255.0 secondary
ip address 192.168.2.3 255.255.252.0
standby 1 ip 192.168.1.2
standby 1 preempt
standby 2 ip 192.168.2.2
standby 2 preempt

NB Make sure that your LAN devices have their gateway pointing to HSRP IP but not the physical interface for example for group 1 the HSRP IP will be 192.168.1.2.Do the same for vlan 50

Steve Rand

• 210 Answers
• Posted on Feb 05, 2009

SOURCE: Sending DHCP request across diffrent vlans

Hmm... on your DHCP server, try setting the "default router" IP for each pool to be the VLAN ID on the switch.

scope 172.16.0.0 /24
router 172.16.0.1

scope 10.20.8.0 /22
router 10.20.8.1

I think the DHCP replies aren't going back where they should. I've never done this without a router doing all the DHCP, but it does work and i've done it many times. Your config looks spot on for the switch.

SOURCE: IP Addressing by dhcp for vlans

Just configure your 4 scopes on your DHCP server, and as long as your server is VLAN tagging and the trunk between the gateway and the switch is dot1q then it will work.

SOURCE: Routing vlans on 3com switch 4500

i can't set ip address over 4 vlans. the 3com switch 4500 always give error message "there's not enough routing resources available".please help....