The bestroute igp-metric-ignore command configures BGP to ignore the IGP cost when selecting the optimal route.
The undo bestroute igp-metric-ignore command restores the default configuration.
By default, BGP uses the IGP cost as one of route selection rules.
Usage Scenario
On a BGP network, a device often receives multiple routes with the same prefix but different paths from different peers. To forward traffic to that prefix address, BGP needs to select an optimal route from these routes. By default, BGP will compare the IGP costs of these routes to their BGP next hops and select a route with the smallest IGP cost.
The bestroute igp-metric-ignore command can be run to configure BGP to ignore the IGP costs in route selection.Configuration Impact
After the bestroute igp-metric-ignore command is run, BGP does not compare the IGP costs of routes to BGP next hops.
<HUAWEI> system-view [~HUAWEI] ip vpn-instance vpna [*HUAWEI-vpn-instance-vpna] ipv4-family [*HUAWEI-vpn-instance-vpna-af-ipv4] route-distinguisher 100:1 [*HUAWEI-vpn-instance-vpna-af-ipv4] quit [*HUAWEI-vpn-instance-vpna] quit [*HUAWEI] bgp 100 [*HUAWEI-bgp] ipv4-family vpn-instance vpna [*HUAWEI-bgp-vpna] bestroute igp-metric-ignore <HUAWEI> system-view [~HUAWEI] ip vpn-instance vpna [*HUAWEI-vpn-instance-vpna] ipv4-family [*HUAWEI-vpn-instance-vpna-af-ipv4] route-distinguisher 100:1 [*HUAWEI-vpn-instance-vpna-af-ipv4] quit [*HUAWEI-vpn-instance-vpna] quit [*HUAWEI] bgp 100 [*HUAWEI-bgp] ipv4-labeled-unicast vpn-instance vpna [*HUAWEI-bgp-labeled-vpna] bestroute igp-metric-ignore