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Beginner

DHCP Relay Configuration on Cisco ASR 9000

I have a trouble when configuring DHCP Relay on Cisco ASR 9000. I've followed the configuration guide on www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r4-2/addr_serv/configuration/guide/b_ipaddr_cg42crs/b_ipaddr_cg42crs_chapter_0100.html . I think my server configuration is right, but still can't get IP on my host. Here is my topology and my recent configuration. Thank in advance.

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9 REPLIES 9

Your configuration on

Your configuration on interfaces should contain vrf TA_DHCP or ip helper address vrf global. Because you main interfaces don't belong to vrf, but you try to forward packets to VRF.

btw. you don't need a ip helper address on interface to dhcp server. 

Beginner

vrf is a little bit confusing

vrf is a little bit confusing me. can I just apply helper address on the interface? just like usual cisco config? btw, I have tried it before, but it seems the router couldn't save my commit.

as i remember ip helper

as i remember ip helper-address <ip> will be replaced with ip helper-address vrf default <ip> by router itself.

Beginner

It's not global but default

It's not global but default in here. can you tell me how to add interface to vrf?

btw, address in "helper-address [vrf vrf- name ] address " refers to DHCP server address ? 

int gi0/0/0/1 

int gi0/0/0/1 

no ipv4 addr 

vrf <VRF_NAME>

ipv4 addr 22.22.22.2/24

int gi0/0/0/11

no ipv4 addr

vrf <VRF_NAME>

ipv4 addr 33.33.33.1/24

ipv4 helper-address vrf <VRF_NAME> <DHCP_IP>

don't forget about static route to 33.33.33.0/24 via 22.22.22.2 or default route on dhcp server. 

Beginner

I changed my vrf name to

I changed my vrf name to dhcp1, and still not working. Here are my configuration:

int gi0/0/0/1 

no ipv4 addr 

vrf dhcp1

ipv4 addr 22.22.22.2/24

int gi0/0/0/11

no ipv4 addr

vrf dhcp1

ipv4 addr 33.33.33.1/24

ipv4 helper-address vrf dhcp1 22.22.22.1

I've tried setting all the IP static and the server still can't ping to client. And I've added ip route on the server btw.

Can server ping its default

Can server ping its default gw ? 

Highlighted
Beginner

Three days ago it can, but

Three days ago it can, but now it can't. I don't know why, but it's maybr a hardware problem. So, if the server can ping its gateway, what is probably wrong?

something wrong with cabling

something wrong with cabling or layer 2 issue.

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