Huawei Quidway NetEngine80E Configuration Manual page 872

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
Checking the Configurations
After the BGP load balancing configurations have been configured, you can run the following
commands to check the configurations.
l
l
# Display the routing table of the VPN instance vpn1. You can see the routes to be used for load
balancing.
<HUAWEI> display ip routing-table vpn-instance vpn1
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: vpn1
Destination/Mask
GigabitEthernet3/0/0
Exception Handling
After the maximum load-balancing number command is run on a device, the device changes
the next hop addresses of the routes received from EBGP peers to the IP address used by the
device to establish a peer relationship with an IBGP peer. Then the device advertises the routes
to the IBGP peer. In
Router B and Router C are IBGP peers.
Figure 8-4 Networking for configuring BGP load balancing
AS 100
1.1.1.9/32
AS 300
4.4.4.9/32
If the maximum load-balancing number command is not run Router B, Router B does not
change the next hop addresses of routes received from Router A and Router D before advertising
the routes to Router C. The command output on Router C is used as an example.
Issue 02 (2014-09-30)
Run the display bgp routing-table [ network [ { mask | mask-length } [ longer-
prefixes ] ] ] command to check routing information in a BGP routing table.
Run the display ip routing-table vpn-instance vpn-instance-name [ verbose ] command
to view the routing table of a VPN instance.
Destinations : 4
Proto
10.1.1.0/24 IBGP
IBGP
10.2.1.0/24 IBGP
IBGP
10.3.1.0/24 Direct 0
10.3.1.1/32 Direct 0
Figure
10.1.1.1/30
RouterA
10.1.3.2/30
RouterD
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Routes : 6
Pre Cost Flags NextHop
255 0 RD
255 0 RD
255 0 RD
255 0 RD
0
0 D
8-4, Router B is an EBGP peer of Router A and Router D, and
AS 200
10.1.1.2/30
RouterB
10.1.3.1/30
8 BGP Configuration
Interface
5.5.5.9 Pos2/0/0
4.4.4.9 Pos1/0/0
4.4.4.9 Pos1/0/0
5.5.5.9 Pos2/0/0
D 10.3.1.1
127.0.0.1 GigabitEthernet3/0/0
10.1.2.1/30
10.1.2.2/30
RouterC
847