Core 4506 HA and DHCP redundancy

[ahmedbishry]

Hi All,

I have a setup with two Cat 4506E working as a HA,

I used a bundle 4Gb interfaces working as ether-channel,

I'm facing a problem with DHCP pools on the both SW's,

There is no problem if I use the pools on one sw,

But when I but the pool on both sw's then I faced a lot of conflict IP in the DHCP pools,

How can setup a real DHCP redundancy on both SW's,

Thanks in advanced for your effort,

Ahmed,

[Reza Sharifi]

Hi,

When you say HA, you mean VRRP, HSRP?

[ahmedbishry]

Dear Reza,

Many thanks for your reply,

Yes I mean HSRP,

Thanks,

Ahmed

[Abzal · Accepted solution]

Hi,
You can configure different pool space to avoid DHCP conflict.
Example:

Sw1:

int vlan 15
ip addr 10.0.0.2 255.255.255.0
standby 15 ip 10.0.0.1

ip dhcp excluded-address 10.0.0.1 10.0.0.3
ip dhcp excluded-address 10.0.0.128 10.0.0.254

ip dhcp pool sw1
net 10.0.0.0 255.255.255.0
default-router 10.0.0.1

Sw2:

int vlan 15
ip add 10.0.0.3 255.255.255.0
standby 15 ip 10.0.0.1

ip dhcp excluded-address 10.0.0.1 10.0.0.3
ip dhcp excluded-address 10.0.0.4 10.0.0.127

ip dhcp pool sw2
net 10.0.0.0 255.255.255.0
default-router 10.0.0.1

Sent from Cisco Technical Support iPhone App

[ahmedbishry]

Dear Abzal,

Many thanks for your advice,

It's really very smart solution,

But is there any other solution to have full DHCP pool redundancy?

Thanks in advanced,

Ahmed,

[Abzal]

Hi,

Glad to help. Actually there is a solution Cisco CNS Registar. But unfortunately I don't experience working with this system. I cannot tell much about it however it provides DHCP/DNS failover.

http://www.cisco.com/en/US/products/sw/netmgtsw/ps1982/index.html

http://www.cisco.com/en/US/prod/collateral/netmgtsw/ps5698/ps1982/data_sheet_c78-634879.html

Hope it will help.

[ahmedbishry]

Dear Abzal,

Many thnaks for your reply,

Yes it's really help me,

I appreciate all your effort,

Many thanks,

Ahmed,