Routing

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  • 1.  Question on EVPN Labels

     
    Posted 22 days ago

    Hi.

     

    Please consider the following EVPN+MPLS topology.

     

    CE1 ----- PE1 ----- P ----- PE2 ----- CE2

     

    PE1 advertises a Type 3 EVPN route to PE2 for received flooded traffic. The advertised label is 25.

    * 3:172.11.20.1:101::610::172.11.20.1/248 IM (1 entry, 1 announced)

    BGP group my-int-group type Internal

         Route Distinguisher: 172.11.20.1:101

         Route Label: 25

         PMSI: Flags 0x0: Label 25: Type INGRESS-REPLICATION 172.11.20.1

         Nexthop: Self

         Localpref: 100

         AS path: [65512] I

         Communities: target:65512:101

         PMSI: Flags 0x0: Label 25: Type INGRESS-REPLICATION 172.11.20.1

     

     

    PE1 also advertises Type 2 EVPN routes to PE2 for received traffic destined to advertised MAC addresses. The advertised label is 16.

    * 2:172.11.20.1:101::610::52:54:00:fb:c3:59/304 MAC/IP (1 entry, 1 announced)

    BGP group my-int-group type Internal

         Route Distinguisher: 172.11.20.1:101

         Route Label: 16

         ESI: 00:00:00:00:00:00:00:00:00:00

         Nexthop: Self

         Localpref: 100

         AS path: [65512] I

         Communities: target:65512:101

     

     

    My question is the following:

    Why are we advertising two different labels for the above two routes when they are both meant to lead received traffic to the same EVPN instance?

     

    user@VMX> show route label 25   

     

    mpls.0: 16 destinations, 16 routes (16 active, 0 holddown, 0 hidden)

    + = Active Route, - = Last Active, * = Both

     

    25                 *[EVPN/7] 00:04:28, routing-instance EVPN1, route-type Ingress-IM, vlan-id 610

                          to table EVPN1.evpn-mac.0

     

     

    user@VMX> show route label 16  

     

    mpls.0: 16 destinations, 16 routes (16 active, 0 holddown, 0 hidden)

    + = Active Route, - = Last Active, * = Both

     

    16                 *[EVPN/7] 00:04:32, routing-instance EVPN1, route-type Ingress-MAC, vlan-id 610

                          to table EVPN1.evpn-mac.0

     

     

    Thanks,

    Deepak


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