Re: I-D Action: draft-ietf-6man-ipv6only-flag-03.txt

[Brian E Carpenter <[e-mail]>]

On 2018-10-23 22:32, Nick Hilliard wrote:
> Mark Smith wrote on 23/10/2018 00:04:
>> I don't have experience with them (been in carrier/ISP land for a
>> quite a while) or knowledge of how widely it is used, however
>> enterprise Wifi APs look to be performing ARP caching to reduce
>> link-layer broadcast traffic, which is IPv4 state being maintained in
>> a layer 2 device. e.g.
> 
> arp proxying can be implemented on several types of network devices 
> (wifi APs, evpn l2 domain edge ports, etc). This is handled in the 
> management plane of those devices and does not impact on the forwarding 
> plane capacity, i.e. it is not affected by the number of ipv4/mac 
> mapping entries in any meaningful way.  It's a non issue.

So, to be a bit picky, your statement that switches don't hold per-host
IPv4 state wasn't quite right. You're stating that they may hold such
state but it doesn't measurably impact forwarding capacity. Fair enough,
and duly noted.

   Brian