I don't think 8-10 S-VLANs with 4K C-VLANs totaling ~40K sub-interfaces will be an issue for VPP to handle, as long as the NICs being polled by device-input node from DPDK or other device drivers are not at a large scale.
I am not clear what was done with PPPoE to address similar issues. I suppose VPP can in theory be enhanced to support IP forwarding on "inner dot1q any" sub-interfaces as follows: * All ARP entries for output IP addresses on that sub-interface must be statically provisioned by control plane via API or user CLI. This means the set IP ARP CLI/API needs to be enhanced to specify what are the inner VLAN tag to use for ARP entry. * The handling of glean adjacency for any IP address using this sub-interface without ARP entry should probably be changed to not sent any ARP requests. * We also need to enhance VPP's arp-request handling on that sub-interface so the VLAN tags are preserved on arp-response. Or alternatively, require any neighbor of the sub-interface to have ARP entries provisioned so it won’t sent ARP requests. I am not sure how much work will be involved in doing this, or if there is any other changes I may have missed. Regards, John -----Original Message----- From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of Raj Sent: Wednesday, December 18, 2019 8:32 AM To: vpp-dev <vpp-dev@lists.fd.io> Subject: Re: [vpp-dev] QinQ and dot1ad any On Tue, Dec 17, 2019 at 7:43 PM John Lo (loj) <l...@cisco.com> wrote: > Without exact match on a L3 sub-interface, VPP has no mechanism to > know what VLAN tags to use for packet output, such as ARP request packets or > IP packets, on that sub-interface. For a big QinQ network (like say about 8 - 10 S-VLAN each with 4K C-VLANs) , the number of interface can become huge. Will that hit some internal VPP limits or will it become a performance problem? Is it a good idea to have a mechanism to provide this information to VPP via a control plane application, like whats is being done for PPPoE, so that only outer VLAN interface needs to be created, while inner VLAN interface will be provided by the control plane application? Is this a road worth traveling? Thanks and Regards, Raj
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