Hi authors, EVPN experts,
Any feedback?
Regards,
Muthu
On Tue, Mar 19, 2019 at 4:00 PM Muthu Arul Mozhi Perumal <
muthu.a...@gmail.com> wrote:
> draft-ietf-bess-evpn-inter-subnet-forwarding describes two ways of
> provisioning the default gateway MAC and IP addresses on the IRB interface
> associated with the corresponding subnet:
>
>
>1. All the PEs for a given tenant subnet use the same anycast default
>gateway IP and MAC addresses . On each PE, this default gateway IP
>and MAC addresses correspond to the IRB interface connecting the BT
>associated with the tenant's VLAN to the corresponding tenant's IP-
>VRF.
>
>2. Each PE for a given tenant subnet uses the same anycast default
>gateway IP address but its own MAC address. These MAC addresses are
>aliased to the same anycast default gateway IP address through the
>use of the Default Gateway extended community as specified in
>[RFC7432], which is carried in the EVPN MAC/IP Advertisement routes.
>
>
> Further below it says:
>
>
>Irrespective of using only the anycast address or both anycast and
>non-anycast addresses on the same IRB, when a TS sends an ARP request
>or ND Neighbor Solicitation (NS) to the PE that is attached to, the
>request is sent for the anycast IP address of the IRB interface
>associated with the TS's subnet and the reply will use anycast MAC
>address (in both Source MAC in the Ethernet header and Sender
>hardware address in the payload).
>
>
> In the above, it says the ARP response or NS will use the anycast MAC
> address. The question is, how is this feasible if the second option of
> provisioning
> the default gateway MAC and IP addresses on the IRB interface are chosen,
> where each PE for a given tenant subnet uses the same anycast default
> gateway IP address but its own MAC address?
>
> Should it instead say:
> the request is sent for the anycast IP address of the IRB interface
>associated with the TS's subnet and the reply will use *configured*
>MAC address?
>
> i.e. s/anycast MAC/configured MAC?
>
> Regards,
> Muthu
>
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