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  • 1.  Unable To Get Multicast To Work

    Posted Mar 17, 2025 12:09 PM

    Super green here, so please go easy on me.  I have been unable to get Multicast to work off of our new HPE Aruba Core Switch 6405v2 in a test environment. It is our first time setting up OSPF, PIM and IGMP at all.  I've combed over so many forums and documents to no avail. Our network is mostly access switches with just the main core.  There are not multiple routers that we would be setting up for Multicast. Just the one. Please see details below.

    Hardware Information
    ==================
    2 x HPE Aruba 6405v2 in VSX - Core Switch

    1 x Cisco 2960-S (24-Port) - Access Switch

    1 x Cisco 2960-X (48-Port) - Access Switch

    Physical Topology
    ==================

    HPE Aruba 6405v2 Core Switches are connected to each other via interface 1/3/46 for Heartbeat and 1/3/47 + 1/3/48 for VSX-ISL

    Cisco 2960-X connects to Secondary 6405v2 interface 1/3/3 | Trunk - Native VLAN 50

    Cisco 2960-S connects to Primary 6405v2 interface 1/3/3 | Trunk - Native VLAN 50

    Configurations
    ==================

    HPE Aruba 6405v2 (Mirrored on both):


    no ip icmp redirect
    vlan 101
        name Test VLAN2
        vsx-sync
        ip igmp snooping enable
    vlan 315
        name Test VLAN
        vsx-sync
        ip igmp snooping enable
    vlan 50
        name In-Band Management
        vsx-sync
        ip igmp snooping enable
    vlan 999
        name OSPF Transit VLAN
        vsx-sync
        ip igmp snooping enable
    interface 1/3/3
        no shutdown                                                
        no routing
        vlan trunk native 50
        vlan trunk allowed all
    interface vlan xxx(Generic VLAN Interface Config)
        description *** Test VLANs ***
        vsx-sync access-lists active-gateways shutdown-on-split irdp mdns-sd-global mgmd policies pim
        ip mtu 9100
        ip address 10.x.x.1/24
        active-gateway ip mac 12:02:00:00:01:00
        active-gateway ip 10.x.x.1
        ip ospf 1 area 0.0.0.0
        ip igmp enable
        ip pim-sparse enable
        ip pim-sparse ip-addr any
    interface vlan 999
        description *** OSPF Transit VLAN ***
        ip mtu 9198
        vsx active-forwarding
        ip address 10.x.x.1/30 (10.x.x.2/30 on Secondary)
        ip ospf 1 area 0.0.0.0
        no ip ospf passive
        ip ospf cost 50
        ip ospf authentication hmac-sha-256
        ip ospf sha-key 1 sha ciphertext ****
        ip igmp enable
        ip pim-sparse enable

    interface loopback 0
        ip address 10.99.10.1/32 (10.99.10.2/32 on Secondary)
        ip ospf 1 area 0.0.0.0
        ip pim-sparse enable
    router ospf 1
        router-id 10.99.10.1 (10.99.10.2 on Secondary)
        max-metric router-lsa on-startup
        passive-interface default
        bfd all-interfaces
        graceful-restart restart-interval 300
        trap-enable
        area 0.0.0.0
    router pim
        enable
        rp-candidate source-ip-interface loopback0 group-prefix 224.0.0.0/4
        bsr-candidate source-ip-interface loopback0
        bsr-candidate priority 250                                 
        active-active
        bfd all-interfaces
        register-source loopback0

    Access Switches:

    interface GigabitEthernet1/0/x
     description ** Trunk to Core ***
     switchport trunk native vlan 50
     switchport mode trunk
     srr-queue bandwidth share 1 30 35 5
     priority-queue out 
     mls qos trust cos
     macro description cisco-switch
     auto qos trust 
     spanning-tree link-type point-to-point

    Extra Details
    ==================

    Cisco 2960-S and 2960-X have IGMP v3 Snooping enabled by default. (Or so the commands say).

    We are using VLC to attempt a multicast stream using RTP over port 5004 using 239.1.2.3.

    Only 239.255.255.250 is returning when checking for IGMP Groups/ IGMP Snooping Groups.

    Checking ip mroute on the core switch does return the 239.1.2.3 and the host that is multicasting.



  • 2.  RE: Unable To Get Multicast To Work
    Best Answer

    Posted Mar 20, 2025 10:28 AM

    I was able to determine that this configuration is in fact working.  VLC is broken on one of the devices for multicast.

    When using a separate multicast-only device I was able to join the stream from the working computer.

    The 239.255.255.250 is the SSDP Broadcast to discover services, and it is necessary unless you are doing static mroutes to your multicast streaming hosts.

    Hope this helps someone!