On 3/25/15 10:23 AM, Antoni Przygienda wrote:
Watching the presentation in the group and instead crowding the mike
here are my comments:
a)It is worth explaining what flavor of ARP proxy eVPN implements.
‘proxy ARP’ I found out has different flavors including e.g. the
router responding with its own MAC to requests representing remote
hosts. Customers & other folks are easily confused by the overloaded
‘proxy ARP’ term in eVPN context.
Yes, that is a part that is underspecified for EVPN. I assume that the
response would include the MAC address of the CE instead of the router's
own MAC address.
b)It is worth explaining what is suggested behavior if eVPN advertises
the same IP with multiple MACs and what happens when e.g. the served
MAC vanishes
Doesn't the EVPN RFC already stating that the routes would be withdrawn
in that case?
c)It is worth explaining what the suggested behavior should be when
‘local-bit’ MACs are being advertised from remotes (and when those
collide)
Does L2VPN handle that in any interesting way? I don't think EVPN
introduces any new failure modes for duplicate MAC addresses.
d)eVPN draft does not explain anything about possibility to snoop @ DHCP
e)the IP duplicate detection is an interesting thing given the
anycast/multicast and other zoo
Presumably not only anycast, but also for some host that might have a
single IP address and use it with different MAC addresses (I think
certain configurations of NIC bonding has that effect.)
FWIW the SAVI RFC provides an approach to tell whether it was a change
in the IP to MAC binding or the IP address being reachable at multiple
MAC addresses at the same time (which is basically to unicast an NS to
the old MAC address - I don't know if that would work will for ARP as well).
That still leaves out what to do in the case of anycast addresses etc.
Regards,
Erik
--- tony
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