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Helper address in EVPN/VXLAN not working

dodgerfan78
Level 1
Level 1

I have an EVPN config for Cat9000 that is working from a L2 and L3 perspective. On the leaf switches, I put helper-address on the SVI that face the hosts. These SVIs are inside a VRF. The client send the DHCP Discover message but the leaf only bridges it into the VXLAN using the MDT rather than acting as a relay. Am I missing something?

This is the config I have:

ip dhcp relay information option vpn

ip dhcp relay information option

ip dhcp relay information trust-all

 

interface Vlan1230

 description vni 11230 default-gateway

 vrf forwarding VRF1

 ip dhcp relay source-interface Loopback211

 ip address 10.5.38.253 255.255.255.0

 ip helper-address 192.168.255.1

 no autostate

end

 

LEAF4# ping vrf VRF1 192.168.255.1 source lo211    

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 192.168.255.1, timeout is 2 seconds:

Packet sent with a source address of 10.5.0.164 

!!!!!

 

Thanks.

1 Accepted Solution

Accepted Solutions

This is what I needed to do: For the L2 leafs with Anycast GWs I needed to enable snooping. For the L2 and L3 Leafs, I needed to make the source the VLAN so that the scope could be determined properly.

View solution in original post

4 Replies 4

Reza Sharifi
Hall of Fame
Hall of Fame

Does it make a difference if you add the below command to the SVI:

ip dhcp relay address 192.168.255.1 use-vrf VRF1

HTH

dodgerfan78
Level 1
Level 1

This command does not exist. Where is that supposed to go? It's not under the SVI:

LEAF4(config-if)#ip dhcp relay ?
information DHCP relay information option
short-lease Set and enable short lease for clients
source-interface Set source interface for relayed messages

 

What @Reza Sharifi meaning are the LO which yoh use as source in same vrf or not?

MHM

This is what I needed to do: For the L2 leafs with Anycast GWs I needed to enable snooping. For the L2 and L3 Leafs, I needed to make the source the VLAN so that the scope could be determined properly.

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