Limitations
These are the limitations for MCT peers to support intermediate router functionality. These limitations are due to load-sharing and fast
convergence trade-os.
• PIM-DM is not supported.
• Few packets may be lost during convergence interval or forwarding duplication may happen.
• MCT client will do ow based load-sharing, not per packet load-sharing.
• Trac loss or duplication will happen when Keep-Alive VLAN, Cluster Communication Protocol (CCP) ,or ICL between MCT
peers are not up.
• Multicast routing congurations on session VLAN is not supported and restricted in conguration.
• The load will only be shared, and may or may not be balanced across the CCEPs.
• During the convergence interval, a few packets may be lost. In the case of recoveries, some packets may end up being
forwarded by both cluster routers during interval.
• Both the MCT peers maintain state and pull down trac for all multicast ows from the core, whether the chassis is forwarding
this stream to the local CCEP or not. This could potentially waste the bandwidth inside the core and on uplink.
• You can congure both MCT peers to do either PIM routing or multicast snooping in MCT VLANs. However, conguring one
MCT peer to do PIM routing and the other to do multicast snooping in the same MCT VLAN is not supported.
• PIM neighbor on CEP in an MCT VLAN is not supported if the MCT cluster is running PIM on the same MCT VLAN.
• First-hop routing (FHR) and "Last-hop routing (LHR) are not supported on MCT clusters on MCT VLAN interfaces.
• Rendezvous points (RP) are not supported on MCT clusters.
• MSDP and Anycast-RP are not supported on MCT clusters.
• This feature is not supported on non default VRFs.
• IPv6 multicast routing on MCT is not supported on MCT clusters.
Conguring multicast routing over MCT
Follow these steps to
congure multicast routing over MCT.
1. Congure an MCT cluster.
2. Congure an MCT member VLAN.
3. Congure multicast routing (PIM) over MCT member VE.
Layer 3 behavior with MCT
FastIron Ethernet Switch Layer 3 Routing
53-1003627-04 585
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