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Does a Device Preferentially Select the Route with the Highest Precedence Rather Than the Route with the Longest Matched Mask?

Latest reply: May 16, 2017 09:36:37 1108 2 0 0 0

Hello everyone,

Does a device preferentially select the route with the highest precedence rather than the route with the longest matched mask?

Please help me! Thank you!

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Adamcolob
Created May 16, 2017 06:20:41

If the longest match policy is not configured for route selection, a device selects an optimal route based on route precedences in RPF selection.

If the longest match policy is configured for route selection, a device selects a route with the longest matched mask in RPF selection. If the masks of routes are in the same length, the device selects an optimal route based on route precedences.

A device selects an optimal route respectively from the multicast static 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:

A route with the longest matched mask is selected from the four routes.

If the masks of four routes are in the same length, the route with the highest preference is selected.

If the preferences of the four routes are the same, a route is selected in the order of multicast static route, MBGP route, MIGP route, and unicast route.

If the longest match policy is not configured for route selection:

The route with the highest preference is selected.

If the preferences of the four routes are the same, a route is selected in the order of multicast static route, MBGP route, MIGP route, and unicast route.
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lanpeng
Created May 16, 2017 09:36:37

1.control plane
2.data(forward plane)
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