Routing

Expand all | Collapse all

Route Distinguisher of the Type 1 (Ethernet AD) EVPN route

  • 1.  Route Distinguisher of the Type 1 (Ethernet AD) EVPN route

     
    Posted 29 days ago

    Hi.

    I have a labbed EVPN setup where a multihoming PE is sending the following two Type 1 EVPN routes to the other PE.

    jcluser@PE2# run show route advertising-protocol bgp 1.1.1.1 table bgp match-prefix 1*

    bgp.evpn.0: 10 destinations, 10 routes (10 active, 0 holddown, 0 hidden)
    Prefix Nexthop MED Lclpref AS path

    1:2.2.2.2:0::01::FFFF:FFFF/192 AD/ESI
    * Self 100 I

    1:2.2.2.2:1::01::0/192 AD/EVI
    * Self 100 I


    The RD of the advertising PE is configured to be 2.2.2.2:1. However, the first Type 1 route above (The per ESI Type 1 route) contains as the senders RD a value of 2.2.2.2:0, not 2.2.2.2:1. Is this expected?

    For reference, here is the EVPN routing-instance configuration of the advertising PE:

    jcluser@PE2# show routing-instances | display set
    set routing-instances EVPN-A protocols evpn
    set routing-instances EVPN-A instance-type evpn
    set routing-instances EVPN-A vlan-id 10
    set routing-instances EVPN-A interface ae0.10
    set routing-instances EVPN-A route-distinguisher 2.2.2.2:1
    set routing-instances EVPN-A vrf-target target:100:1


    Thanks,
    Deepak

     



  • 2.  RE: Route Distinguisher of the Type 1 (Ethernet AD) EVPN route

    Posted 29 days ago
    One is constructed for the device:
    1:2.2.2.2:0::01::FFFF:FFFF/192 AD/ESI
    FFFF:FFFF = MAX-ET (EthernetTag)

    This one is constructed for the MAC-VRF (=EVPN-A):
    1:2.2.2.2:1::01::0/192 AD/EVI
    There could be many units on the interface (ae0) each in separate MAC-VRF, each creating an Ethernet A-D route (Type 1)

    I don't have the full explanation for you, but the RFC7432 (chapter 8.4.1) is referring to Aliasing : https://tools.ietf.org/html/rfc7432#section-8.4.1 :
    Support of this route is OPTIONAL.
    (For the MAC-VRF Ethernet A-D)

    The chapter for the device A-D route is 8.2.1 in the same RFC.


  • 3.  RE: Route Distinguisher of the Type 1 (Ethernet AD) EVPN route

     
    Posted 21 days ago
    Thanks flashover.