dhcp server

[Santosh Kumar2]

hi ,

we have two nexus switch in vpc and 5 access 2960 switch in stack. i am trying to config dhcp on catalyst 2960 and dhcp relay under L3 vlan on both nexus. it's not working.

[balaji.bandi]

your nexus acting as DHCP Server ? what nexus switch and code running on it.

can you post config information from nexus.also client side (switch config for the DHCP relay or helper address config)

[Santosh Kumar2]

Hi Balaji,

Thanks for your revert.

correct me if i am wrong, we need DHCP server and i got some article where i found we can not create dhcp on nexus switch.

so what i am doing is , i have 2 L3 vlans on Nexus, i am creating Dhcp on my edge switch and call dhcp relay on nexus on those vlan, but it is not working.

please find below for your reference.

Edge switch:-

ip dhcp pool JFL-LAN
import all
vrf default
network 10.219.4.0 255.255.252.0
default-router 10.219.4.1
update arp

on Nexus:

interface Vlan12
no shutdown
no ip redirects
ip address *.*.*.*/**

no ipv6 redirects
hsrp 12
preempt
priority 110
ip *.*.*.*
ip dhcp relay address *.*.*.*

please suggest.

[MHM Cisco World]

it straight config on issue, 
but are the SW is connect to both vPC pair ?

[Santosh Kumar2]

yes, i had configured lacp between both nexus and edge switch.

[MHM Cisco World]

are you config any peer-gateway

[Georg Pauwen]

Hello,

the default router in the DHCP pool is the HSRP standby IP address I assume ? Post the configs without the IP addresses being banked out. What Vlan(s) is/are the clients in ? Post a schematic drawing of your entire topology, so we can see where the clients are sitting, and why you need the helper-address.

[balaji.bandi]

why are you mentioning VRF here?

[Santosh Kumar2]

i was tried with vrf but i was not worked

[Santosh Kumar2]

Hi Guy's,

kindly find the attachment for your better understanding.

on the edge switch , i am only using mgmt ip , not on dhcp pool vlan. 

[MHM Cisco World]

only add peer-gateway under vPC domain if you not config it.

[Santosh Kumar2]

Hi MHM,

i had configured peer destination ip under Vpc.

[MHM Cisco World]

https://www.cisco.com/c/en/us/support/docs/ios-nx-os-software/nx-os-software/217274-understand-virtual-port-channel-vpc-en.html

I am talking about peer-gateway for vPC, for more detail check link above 

[balaji.bandi]

what is the model of Nexus - also why you need to VRF question

for L3 routing on NEXUS you need to check this  :

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus7000/sw/security/config/cisco_nexus7000_security_config_guide_8x/configuring_dhcp.html

https://bradhedlund.com/2010/12/16/routing-over-nexus-7000-vpc-peer-link-yes-and-no/