VXLAN with Anycast RP & PIM

VXLAN with Anycast RP and PIM

We know that L2VNI specific layer 2 BUM traffic is forwarded by following ways in VXLAN fabric:

Via Underlay network Multicast routing
Via Ingress-replication , in which copy of each ingress L2BUM frame is sent as unicast to every VTEP participating in same L2VNI.

In this chapter we will learn , VXLAN on PIM Multicast routing with Anycast-RP .

Below is the Topology used to explain the VXLAN on Multicast . Where Spine-11 and Spine-12 shares the Same Anycast-RP ( rendezvous Point ) IP address and belong to same Anycast-RP Set, that uses Loopback 200 IP.

On both Spine ,additional loopback is also configured and are uses to identify as Anycast-RP group member. These Both IP address must be reachable from all switches.

Now Lets understand the configuration of Anycast-RP Multicast Routing Solution.

Step1: Configure Anycast-RP Cluster on both Spine Switches

Enable PIM on both Spine Switches
Configure Loopback 200 for Anycast-RP on both Switches
Enable PIM and OSPF on these Interfaces.

feature pim ! interface loopback200 description ** Anycast-RP address ** ip address 192.168.200.200/32 ip router ospf UNDERLAY-NET area 0.0.0.0 ip pim sparse-mode

Step2: Assign Cluster Member IP and define Members on Spine Switches

Configure Unique Cluster member IP for each Anycast-RP Cluster member.
Enable PIM-SM and OSPF on it.

Configuration:

interface loopback11 description ** Unique Address for Anycast-RP ** ip address 192.168.121.11/32 ip router ospf UNDERLAY-NET area 0.0.0.0 ip pim sparse-mode ! ip pim anycast-rp 192.168.200.200 192.168.121.11 ip pim anycast-rp 192.168.200.200 192.168.121.12

Step3: Configure Group-Specific Rendezvous Point RP to all Switches

ip pim rp-address 192.168.200.200 group-list 224.0.0.0/4

Now below topology shows rest of the device configured IP address , which will be used in rest of the Topic.

Once this all pre-requisite is done , your Anycast-RP configuration is nor ready and underlay network is capable of forwarding L2BUM Traffic.

Now lets configure the user VLAN , named VLAN 10 , which is attached to VNI 10000 on both of the VTEP . the Multicast Group 238.0.0.10 is also attached to VNI 10000 under NVE ( Network Virtualization Edge) interface. These configuration is to be done on both VTEP switches , VTEP-101 , VTEP-102.

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VXLAN with Anycast RP & PIM