Dell PowerSwitch S4128F-ON OS10 Enterprise Edition User Guide Release 10.4.3.0 - Page 673
Multicast support on VLT, Source on VLT, forwarded to DR
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0/0 pim-assert messages sent/received 0/0 register messages sent/received Multicast support on VLT OS10 supports multicast in a VLT domain in active-standby mode. In a VLT domain that is in active-standby mode, the designated router (DR) routes multicast traffic (Layer 3) and the other peer VLT node switches (Layer 2) incoming multicast traffic over VLTi links. In last hop router (LHR), the DR is responsible for triggering upstream PIM joins, but the traffic from RP can reach any one of the VLT peers. For example, if the traffic reaches a peer VLT node that has not triggered the upstream join, it switches the incoming multicast traffic over VLTi links which will reach the originating LHR-DR node. The traffic then gets routed at this node. The L3 routed traffic gets replicated over VLTi links for all the receiver VLANs. This traffic is processed by non-DR LHR node and it forwards it to appropriate receivers based on VLT L2 traffic forwarding rules. The behavior is the same with first hop router (FHR) as well, where PIM registration is initiated by DR. The PIM join could be sent to the DR or the non-DR FHR node. If the incoming multicast traffic reaches the node which receives the PIM join, it routes the packet towards the RP. If the incoming multicast traffic reaches the peer VLT node that has not received the PIM join, it switches the packet over the VLTi link to the other node, which will route the packet towards the RP. The active-standby mechanism can potentially oversubscribe VLTi links, as multiple copies get replicated for the outgoing receiver VLANs. Dell EMC recommends using only one PIM upstream VLAN towards the RP/source from FHR/LHR. The following section provides a high-level description of traffic flows for different use cases. The term, spanned VLAN used in the following illustration refers to a VLAN that is configured on both the VLT nodes. NOTE: Dell EMC recommends that you align the designated router of all spanned VLANs, VLT VLANs and non-VLT VLANs, on to a single VLT node. Source on VLT VLAN-traffic forwarded to DR In the following illustration, the source is in VLT VLAN (VLAN 11) and traffic is forwarded to the designated router (R2). Multicast 673
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1,181
-
1,182
-
1,183
-
1,184
-
1,185
-
1,186
-
1,187
-
1,188
-
1,189
-
1,190
-
1,191
-
1,192
-
1,193
-
1,194
-
1,195
-
1,196
-
1,197
-
1,198
-
1,199
-
1,200
-
1,201
-
1,202
-
1,203