[c-nsp] Cisco ASR9001 VXLAN Support

[Adam Vitkovsky]

Hi Skeeve,

> Skeeve Stevens
> Sent: Thursday, October 08, 2015 5:41 AM
> Hi Harold,
>
> I am wanting to get my Cisco ASR9001 talking VXLAN to my Arista Switch.
>
> The Arista VXLAN Unicast VTEP config is EXTREMELY simple.
>
>
> This is the Arista config example:
>
> *Swtich A*
>
> interface Loopback0
>    ip address 1.1.1.1/32
> !
> interface Vxlan1
>    vxlan vlan 100 vni 100000
>    vxlan vlan 100 flood vtep 1.1.1.2
> !
>
> *Switch B*
>
> interface Loopback0
>    ip address 1.1.1.2/32
> !
> interface Vxlan1
>    vxlan vlan 100 vni 100000
>    vxlan vlan 100 flood vtep 1.1.1.1
> !
>
> it is as simple as that.  I would love to have the ASR9001 participating in the
> VXLAN of these Arista.
>
> Do you think the feature that was added is compatible with this?
>
I don't think there is an option to manually define VTEPs.
But that would make sense only in very small deployments.
Because without multicast overlay the BUM traffic has to be unicasted to all VTEPs sharing a common VNI.

As Harrold mentioned the last evolutionary step is "VXLAN Network with MP-BGP EVPN Control Plane" (supported only on Nexus9K) where multicast-based data driven flood and learn for remote VTEP peer discovery and remote end-host learning is replaced by MP-BGP EVPN as the control plane for VXLAN so if an end-host is active it's MAC address is advertised to other VTEPs via MP-BGP so there's no concept of flooding traffic destined to unknown unicast MAC address. And to reduce broadcast traffic there's the ARP suppression where the MAC to IP mapping is advertised via MP-BGP between VTEPs.
But even with all these features there's still a need for multicast overlay to facilitate flooding of other broadcast/multicast traffic within each VNI segment.

With regards to EVPN CP for VXLAN on ASR9k
To my knowledge ASR9k can only serve as DCI L3 GW (into L3VPN) for an MP-BGP EVPN VXLAN based DC.
So I guess it's not yet possible to integrate MP-BGP EVPN VXLAN based DC with EVPN or PBB-EVPN based L2VPN backbone which I guess is what all of this is heading towards.

adam


        Adam Vitkovsky
        IP Engineer

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E:      Adam.Vitkovsky at gamma.co.uk
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