Bgp Route Selection Rules - Huawei Quidway NetEngine80E Configuration Manual

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
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8.27.2 BGP Route Selection Rules

When multiple routes are available to the same destination, BGP selects one optimal route based
on BGP route selection rules and adds it to the IP routing table for traffic forwarding.
Figure 8-11
Issue 02 (2014-09-30)
Remarks
BGP can use routing polices when importing routes from other protocols, receiving
routes from BGP peers, or advertising routes to BGP peers. Routing polices can be
used to filter routes or modify route attributes.
BGP supports automatic and manual summarization. Multiple routing policies can be
used during manual summarization.
BGP selects routes based on strict route selection rules, which is the key point to be
discussed in the following part.
BGP adds the optimal route to the BGP routing table and advertises it to BGP peers.
BGP adds the routes learned from peers and the optimal route in the BGP routing table
to the IP routing table for traffic forwarding.
shows how the optimal route is selected.
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