[c-nsp] Setting relay agent IP on 4500

[Jason Lixfeld]

Nope.  That's how it's configured already.  No Dice.

Sent from my iPhone

> On Jul 28, 2017, at 9:34 PM, Nathan Lannine <nathan.lannine at gmail.com> wrote:
> 
> 
> 
> On Jul 28, 2017 5:12 PM, "Jason Lixfeld" <jason at lixfeld.ca> wrote:
> Hi all,
> 
> I’ve got a 4500 Sup7L-E running 15.2(2) acting as a DHCP relay with clients directly connected to it.  The client interfaces on this relay are in VRFs, and the helper is in the global table.
> 
> The issue is the 4500 stamps the relay agent IP in the DISCOVER as being the incoming interface IP where the DISCOVER was received, which is in a VRF.  As such, the DHCP server tries to send the OFFER to that IP, but it’s not reachable due to it being in a VRF, and is subsequently dropped upstream.
> 
> Does the "global" argument not accomplish this?
> 
> I.e. "ip helper-address global <address>"
> 
> That's how I read this:
> http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp/command/iap-cr-book/iap-i1.html#wp1413119578
> 
> Of course the above is more clear in it's description of using the "vrf" argument.
> 
> - Nathan