Layer 3 handoff with more than one fusion router?

[acc.94]

Hello all.

Would be possible to establish more than one BGP session between the border node and two different fusion routers for the default gateway of fabric's traffic? I mean, during the IP transit configuration and L3 handoff process (which is automatized), is it possible to configure more than one BGP peering?

Thank you!

[Madura Malwatte]

In your fabric topology you can select the border node and when you go to specify its role, it brings you to the settings of the border node. This is where you define the border is an external border or internal or both, its local AS number, handoff IP Pool, the external interfaces to use and VN's. The automation will use the border handoff IP Pool and will take a /30 from this pool and configure a peering session per VN, per interface. You can define multiple external interfaces and assuming you are connected to fusions on separate interfaces, the interface config and bgp peering will be automated. With the /30's that are auto configured, you can then configure the fusion router's side with the corresponding IP from the same /30.

[Scott Hodgdon]

acc,

Yes, this is possible. You can even hand off some VNs to one peer device and other VNs to a different peer device if you wish.

With DNAC / SDA 2.2.2.3 and newer, you can now customize the VLANs used for the handoffs, and you can use the same VLANs across all borders in all sites if you want. See Table 8 at https://www.cisco.com/c/en/us/td/docs/cloud-systems-management/network-automation-and-management/dna-center/2-2-2/release_notes/b_cisco_dna_center_rn_2_2_2.html#concept_ogz_jz5_rgb .

Cheers,
Scott Hodgdon

Senior Technical Marketing Engineer

Enterprise Networking and Cloud Group