Multicast Over MLAG Configuration
Consider the following sample topology for MLAG:
DUT-1(core lic)======ISC vlan========DUT-2(core lic)
| |
+----------------DUT-3(edge lic)---------------+
DUT-1 and DUT-2 are MLAG peers, DUT-3 is a L2 switch whose uplink is a LAG up to the pair of
MLAG switches.
- RP and BSR can be configured on same device along with MLAG config but
we recommend to keep RP node away from MLAG peers. One MLAG peer will be Designated Router(DR)
and another one will be elected as NON-DR for MLAG vlan. DR node will send *,G and try to pull
the traffic from RP. Non-DR does not pull the traffic until DR is alive. If you config RP on
Non-DR node then both MLAG peers will pull the traffic which will trigger the assert to avoid
the traffic duplication. It is not recommended to setup RP on any vlan on MLAG peers.
- It is best to avoid the assert operation since a small amount of traffic duplication happens
during the this operation. You can avoid assert in some, but not all the scenarios.
- DR priority configuration will help to make RP node as DR. (The DR priority feature is
available from ExtremeXOS15.3.2 release onwards).
- It is recommended that for PIM-SM deployments that the RP is configured on loopback VLANs
instead of regular VLANs. This ensures continuous connectivity to the RP needing active ports
present in that respective VLAN.