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MurthyKanuri
Beginner

Domain Controller ip to be allowed for DHCP relay.

Hai,

I have a Nexus 7000 Core Switch , and i need to allow the domain controller ip 10.x.x.x for DHCP relay on switch.

I need the steps or syntax to implement the same.

With Regards

Murthy Kanuri

4 REPLIES 4
mfurnival
Enthusiast

You need something like this:

interface Vlan20

ip dhcp relay address 10.1.1.1

Bilal Nawaz
Engager

Hello,

Please see http://packetlife.net/blog/2012/jun/28/dhcp-relay-nx-os/

You may need to enable these?

feature dhcp

interface vlan x

ip dhcp relay address x.x.x.x

https://supportforums.cisco.com/docs/DOC-14753

http://www.cisco.com/en/US/docs/switches/datacenter/sw/4_1/nx-os/security/configuration/guide/sec_dhcpsnoop.html#wp1288108

Hope this helps

Please rate useful posts and remember to mark any solved questions as answered. Thank you.

Please rate useful posts & remember to mark any solved questions as answered. Thank you.
sbhadrav@cisco.com
Contributor

1st. what broadcast packets and which protocols do you want to forward via ip helper-address command ?

2nd. Exemple: In case of dhcp, if dhcp server is on the same LAN with the clients you don't need to use ip helper-address because the broadcast packets will be received also by the dhcp server which will do his job.. If the dhcp server is outside the LAN with the clients than you need ip help-address command.

sbhadrav@cisco.com
Contributor

The DHCP can be installed on a server as part of the AD and can also be located at the central location.  As long as the DHCP server is routed and reachable by the remote hosts, than they can obtain an IP address from it.  So, although it nice to have a local DHCP at each location, but it is not necessary.

http://www.cisco.com/en/US/docs/ios/12_2/ip/configuration/guide/1cfdhcp.html