TOI Author :: Alton Lo

Multihoming in EVPN allows a single customer edge (CE) to connect to multiple provider edges (PE or tunnel endpoint). These PE devices are all connected to the same Ethernet-Segment (ES). Multihoming is activated by assigning a unique Ethernet Segment Identifier (ESI) and ES-Import Route Target (RT) which enables all the PEs connected to the same multihomed site to import the Type 4 ES routes

This new feature explains the use of the BGP Domain PATH (D-PATH) attribute that can be used to identify the EVPN domain(s) through which the EVPN MAC-IP routes have passed. EOS DCI Gateway provides new mechanisms for users to specify the EVPN Domain Identifier for its local and remote domains.   DCI Gateways sharing the same redundancy group should share the same local domain identifier and same remote domain identifier.

With a static configured import and export route-target for a given vlan-aware-bundle, all its VLAN members share the same route-target value.  For example, EVPN uses the same route-target in the Type2 EVPN route advertisements for hosts residing in two different VLAN of the same bundle.  

RFC7432 defines the MAC/IP advertisement NLRI (route type 2) for exchanging EVPN overlay end-hosts’ MAC and IP address reachability information. When an EVPN MAC/IP route contains more than one path to the same destination, the EVPN MAC/IP best-path selection algorithm determines which of these paths should be considered as the best path.

EVPN route advertisements carry RD and RT. RD (Route Distinguisher) : prepend to the tenant’s IP Prefix or MAC address to make it globally unique. RT (Route Target) : a BGP extended community used to tag the EVPN route.  The EVPN import policy is chosen to select what is the target tenant VRF is imported from the global EVPN table.

EVPN Multihoming defines a mechanism for Multihoming PEs to quickly signal, to remote PEs, a failure in an Ethernet Segment (ES) connectivity with the use of Ethernet A-D per ES route

To use IPv6 addresses for VXLAN underlay, there are two different approaches.  The first approach is to make use of

As described in the L3 EVPN VXLAN Configuration Guide, it is common practice to use Layer 3 EVPN to provide multi

In the Centralized Anycast Gateway configuration, the Spines are configured with EVPN IRB and are used as the IP

Starting with EOS release 4.22.0F, the EVPN VXLAN L3 Gateway using EVPN IRB supports routing traffic from IPV6 host to

“MLAG Domain Shared Router MAC” is a new mechanism to introduce a new router MAC to be used for MLAG TOR