How does an S series switch select the RPF route

If the longest match policy is not configured for route selection, a multicast router selects an optimal route as the RPF route based on route precedences.
If the longest match policy is configured for route selection, a multicast router selects a route with the longest matched mask in RPF selection. If the masks of routes have the same length, the router selects an optimal route based on route precedences.

A multicast router selects an optimal route respectively from the static multicast routing table, MBGP routing table, MIGP routing table, and unicast routing table, and then selects one route from the four routes as the RPF route. Route selection rules are as follows:
- If the longest match policy is configured for route selection:
1. A route with the longest matched mask is selected from the four routes.
2. If the masks of four routes have the same length, the route with the highest preference is selected.
3. If the four routes have the same preferences, a route is selected in the order of static multicast route, MBGP route, MIGP route, and unicast route.

- If the longest match policy is not configured for route selection:
1. The route with the highest preference is selected.
2. If the four routes have the same preferences, a route is selected in the order of static multicast route, MBGP route, MIGP route, and unicast route.

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