Figure 128. PIM-Sparse Mode Support on VLT
On each VLAN where the VLT peer nodes act as the rst hop or last hop routers, one of the VLT peer nodes is elected as the PIM
designated router. If you congured IGMP snooping along with PIM on the VLT VLANs, you must congure VLTi as the static multicast
router port on both VLT peer switches. This ensures that for rst hop routers, the packets from the source are redirected to the designated
router (DR) if they are incorrectly hashed. In addition to being rst-hop or last -hop routers, the peer node can also act as an intermediate
router.
On a VLT-enabled PIM router, if any PIM neighbor is reachable through a Spanned Layer 3 (L3) VLAN interface, this must be the only PIM-
enabled interface to reach that neighbor. A Spanned L3 VLAN is any L3 VLAN congured on both peers in a VLT domain. This does not
apply to server-side L2 VLT ports because they do not connect to any PIM routers. These VLT ports can be members of multiple PIM-
enabled L3 VLANs for compatibility with IGMP.
To route trac to and from the multicast source and receiver, enable PIM on the L3 side connected to the PIM router using the ip pim
sparse-mode command.
892
Virtual Link Trunking (VLT)
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