Huawei Quidway NetEngine80E Configuration Manual page 870

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
l
Issue 02 (2014-09-30)
NOTE
l If there are multiple routes to the same destination but these routes pass through different
ASs, load balancing cannot be implemented among these routes by default. To implement
load balancing among these routes, run the load-balancing as-path-ignore command.
After the load-balancing as-path-ignore command is run, the device no longer compares
the AS_Path attributes of the routes to be used for load balancing. Therefore, exercise
caution when using this command.
l The load-balancing as-path-ignore and bestroute as-path-ignore commands are
mutually exclusive.
7. (Optional) Run:
bestroute igp-metric-ignore
BGP labeled routes can be selected, regardless of their IGP metric values.
By default, BGP labeled routes with the same destination but different next-hop metric
values cannot balance traffic. To enable these routes to balance traffic, run the
bestroute igp-metric-ignore command. After this command is run, routes can be
selected to balance traffic, regardless of their IGP metric values. Exercise caution
when using this command.
Set the maximum number of EBGP and IBGP routes to be used for load balancing.
This configuration is used in a VPN where a CE is dual-homed to two PEs. When the CE
and one PE belong to an AS and the CE and the other PE belong to a different AS, you can
set the number of EBGP and IBGP routes to be used for load balancing. This allows VPN
traffic to be balanced among EBGP and IBGP routes.
1. Run:
system-view
The system view is displayed.
2. Run:
bgp { as-number-plain | as-number-dot }
The BGP view is displayed.
3. Run:
ipv4-family vpn-instance vpn-instance-name
The BGP-VPN instance view is displayed.
4. Run:
maximum load-balancing eibgp number
The maximum number of EBGP and IBGP routes is set for load balancing.
By default, the maximum number of EBGP and IBGP routes to be used for load
balancing is not set.
5. (Optional) Run:
maximum load-balancing eibgp number
The device has been configured whether to change the next hop addresses of the routes
to be advertised to a local address.
If you run the maximum load-balancing eibgp number command, the device changes
the next hop addresses of the routes to be advertised to a local address no matter
whether the routes are used for load balancing.
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8 BGP Configuration
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