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EIGRP

The routing protocol Enhanced Interior Gateway Routing Protocol (EIGRP) is supported only on Cisco IOS XE SD-WAN devices on SD-WAN Manager version 19.1 and higher and is supported only on the service-side to peer with routers at the local site. By default, EIGRP is not redistributed into OMP nor are routes redistributed from OMP to EIGRP, so redistribution in both directions must be explicitly configured.

For loop prevention, when OMP routes are redistributed into EIGRP, the prefixes are tagged with an External Protocol ID attribute equal to 17, meaning “OMP-Agent” in its topology table. When updating the Routing Information Base (RIB), the prefix is tagged with the “SDWAN-Down” bit set, and the Administrative Distance is set to 252. Since the redistributed routes have a higher Admin Distance than OMP, the routes are not redistributed back to the SD-WAN Controllers.

When an EIGRP route is redistributed into OMP, the origin protocol and metric (combination of bandwidth and delay) is redistributed into OMP. The metric that is carried in OMP can influence which WAN Edge router at a site is preferred from the remote site over the SD-WAN fabric. The metric with the lowest value is preferred.

https://www.cisco.com/c/en/us/td/docs...

For redistribution of OMP routes into EIGRP, whenever the redistribution admin distance is set as 252. When a route is redistributed from OMP into EIGRP, it is advertised with an opaque flag, so that when received by another SDWAN cEdge router it should be installed with an admin distance of 252 (which is actually one more than the OMP protocol AD of 251). This is so the receiving cEdge will always prefer its own route over the SDWAN fabric.

https://bst.cisco.com/quickview/bug/C...

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#sdwan
#eigrp