Lab Minutes Forum

Technical Discussion => Routing and Switching => Topic started by: Administrator on March 17, 2024, 08:48:36 PM

Title: SDA transit on behalf of Ivan O.
Post by: Administrator on March 17, 2024, 08:48:36 PM

 Hi, I watched your videos on SDA transit between multi sites. Does it mean that when end point is sending DHCP request it goes over underlay, and DHCP offer goes over overlay? Thank you.

Title: Re: SDA transit on behalf of Ivan O.
Post by: MC on March 18, 2024, 07:51:20 PM

Endpoint DHCP should always sent/received on an overlay and why you need IP Transit to allow packet to get to a DHCP server outside of the fabric.

Title: Re: SDA transit on behalf of Ivan O.
Post by: Administrator on March 19, 2024, 08:59:20 PM

as per my understanding, transit control node only learns LISP prefixes which then redistributes them in MPBGP towards BC nodes at sites.

At HQ, there is some route leaking between VRFs for some shared services in DC.Does this mean that it is mandatory to redistribute BGP prefixes ožat HQ site into LISP so they get advertised to transit control node?

If not, how BC nodes at other sites would learn about those prefixes if transit control node is not learning BGP prefixes?

What am I missing?

Thank you in advance.

Title: Re: SDA transit on behalf of Ivan O.
Post by: MC on March 21, 2024, 07:30:58 PM

You are correct. Because MPBGP was used between BC and Transit Control node, LISP routes at each VRF/Site need to be redistributed into MPBGP and this includes any external routes learned by a site Border node. These are all taken care of by DNAC and there is nothing you need to do manually in terms of redistribution.