Bgp Community Configuration Example - HP FlexFabric 12900E Series Configuration Manual

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The route 9.1.1.0/24 has two next hops, 3.1.1.1 and 3.1.2.1, both of which are marked with a
greater-than sign (>), indicating that they are the optimal routes.
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By using the display ip routing-table command, you can find two routes to 9.1.1.0/24. One
has next hop 3.1.1.1 and output interface VLAN-interface 200, and the other has next hop
3.1.2.1 and output interface VLAN-interface 300.

BGP community configuration example

Network requirements
As shown in
Configure NO_EXPORT community attribute on Switch A to make routes from AS 10 not advertised
by AS 20 to any other AS.
Figure 69 Network diagram
Vlan-int200
200.1.2.2/24
Loop0
2.2.2.2/32
AS 20 Switch B
Configuration procedure
1. Configure IP addresses for interfaces. (Details not shown.)
2. Configure EBGP connections:
# Configure Switch A.
<SwitchA> system-view
[SwitchA] bgp 10
[SwitchA-bgp-default] router-id 1.1.1.1
[SwitchA-bgp-default] peer 200.1.2.2 as-number 20
[SwitchA-bgp-default] address-family ipv4 unicast
[SwitchA-bgp-default-ipv4] peer 200.1.2.2 enable
[SwitchA-bgp-default-ipv4] network 9.1.1.0 255.255.255.0
[SwitchA-bgp-default] quit
# Configure Switch B.
<SwitchB> system-view
[SwitchB] bgp 20
[SwitchB-bgp-default] router-id 2.2.2.2
[SwitchB-bgp-default] peer 200.1.2.1 as-number 10
[SwitchB-bgp-default] peer 200.1.3.2 as-number 30
[SwitchB-bgp-default] address-family ipv4 unicast
[SwitchB-bgp-default-ipv4] peer 200.1.2.1 enable
[SwitchB-bgp-default-ipv4] peer 200.1.3.2 enable
[SwitchB-bgp-default-ipv4] quit
Figure 69, Switch B establishes EBGP connections with Switch A and Switch C.
Loop0
1.1.1.1/32
Vlan-int200
200.1.2.1/24
Switch A
EBGP
EBGP
Vlan-int300
200.1.3.1/24
Vlan-int100
9.1.1.1/24
AS 10
Loop0
3.3.3.3/32
AS 30
Vlan-int300
200.1.3.2/24
Switch C
313