[c-nsp] DHCPv6 on IOS-XR with multiple pools?

[Bryan Holloway]

So, thanks to an astute reader, 4900Ms running 15.1 -- no bueno.

However: 15.2 on the 4900M -- I can do what I should be doing on the 
edge, so this is less of an issue now. However, I would still be 
interested in hearing from anyone who has made DHCPv6/PD scalable in IOS-XR.

Cheers,
		- bryan


On 11/13/18 2:29 PM, Bryan Holloway wrote:
> Howdy all ...
> 
> Consider a Cisco 4900 with two L3-anchored VLANs in a GPON/FTTx-type 
> scenario: one for business customers, and one for residential.
> 
> Both VLANs have a unique local /64 for customer ONTs, but I also want to 
> do PD with /56s.
> 
> I learned quickly that the 4900 doesn't do DHCPv6 serving, but it will 
> happily relay.
> 
> Upstream we have an ASR running 5.3.4.
> 
> On it I've been successful in creating "dhcp ipv6" server profiles, 
> "prefix-pools", "address-pools" and subsequently anchoring them to the 
> downstream interface facing the 4900, but I don't appear to be able to 
> differentiate between pools for the two VLANs.
> 
> That is, I see assignments, but I'm not sure if the IOS-XR 
> implementation supports having multiple prefix-pools and address-pools 
> bound to a single downstream interface. It always appears to pick one or 
> the other, no matter what I do with the config.
> 
> I see that there is a way to create "class"es within the "dhcp ipv6" 
> config, but it doesn't seem to really do anything. That is, I can create 
> a RESIDENTIAL class with its own address-pool and prefix-pool, and 
> likewise a BUSINESS class with its own address-pool and prefix-pool, but 
> the ASR doesn't seem to match the incoming request from the relaying 
> 4900 interface and choose the correct pool(s).
> 
> Anyone made this work before? I can send config examples if it helps. 
> I've searched the docs but what I've found is a little sketchy.
> 
> N.B.: And yes -- I should probably be doing this with a proper DHCP 
> server ... but I'm in a bit of crunch.
> 
> Thanks!
>              - bryan
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