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Hi all! I need some help with multicast on EOS. I have an Arista DCS-7050S-64-F with EOS version 4.18.11M The Arista is connected to the Juniper QFX via PIM and OSPF (vlan 3025). Vlan 7 is multicast vlan for our multicast receivers from L2 domain. I receive all RPs from PIM neighborhood. But I can’t see multicast if subscribe to multicast group from undirected network (any network which unknown for the Arista). And PIM-Join is not send from the Arista to the Juniper. If I subscribe from directly connected network (vlan7) I see multicast TV. What should I do in order to subscrbibe to multicast from any networks?
The Arista config: ip igmp snooping vlan 7 querier version 2 interface Ethernet1 interface Ethernet5 interface Loopback1 interface Vlan7 interface Vlan3025 ip routing !
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Hi Roman, So all users in Vlan 7 can subscribe to the Multicast Group and can receive traffic but not the users that are in other Vlans (example Vlan 10, 12, 500) From your configuration, we can see "interface vlan 7" but I don't see any "interface vlan" for Vlan 10, 12 and 500 (no SVIs), assuming those are the undirected networks you were talking about. Is the Arista switch acting as pure Layer2 (only bridging) for the Vlan 10, 12 and 500 ? If Yes, then:
How Layer2 Multicast would work:
If Arista is not supposed to be L2 for Vlan10, 12 and 500, then you need to create SVI for those Vlan and have to enable PIM sparse-mode on them. Let us know if there is something we understood incorrectly. Regards, Aniket |
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Thanks Roman. I can see that you only have problems when the source address for the subscribers do not match the subnet for the interface VLAN they are connected to. In this example:
One command that you can try configuring on the VLAN interface is the following:
The default is Here is more info: https://www.arista.com/en/um-eos/eos-section-39-6-igmp-and-igmp-snooping-commands#ww1143351 I hope this helps! Pedro Yes! It works!!! Thank you!!!
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Glad it worked Roman. Thanks for using Arista! P |
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Hi Aniket!
Thanks for you answer Switch is working in bridge mode for vlans 10,12,500. Only vlan 7 is multicast vlan.
For example, if I subscribing from source address 172.30.136.242/29 (direct network on vlan 7), multicast is working and I see PIM-join to my Juniper.
For example,
in Extreme Switches it's problem can be fixed with command
configure pim add vlan sparse passive
in Juniper Switches with command
set protocols igmp interface