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3. Configure BGP community:
# Configure a routing policy.
[SwitchA] route-policy comm_policy permit node 0
[SwitchA-route-policy-comm_policy-0] apply community no-export
[SwitchA-route-policy-comm_policy-0] quit
# Apply the routing policy.
[SwitchA] bgp 10
[SwitchA-bgp] address-family ipv4 unicast
[SwitchA-bgp-ipv4] peer 200.1.2.2 route-policy comm_policy export
[SwitchA-bgp-ipv4] peer 200.1.2.2 advertise-community
Verifying the configuration
# Display the routing table on Switch B.
[SwitchB] display bgp routing-table ipv4 9.1.1.0
BGP local router ID: 2.2.2.2
Local AS number: 20
Paths: 1 available, 1 best
BGP routing table information of 9.1.1.0/24:
From : 200.1.2.1 (1.1.1.1)
Relay nexthop : 200.1.2.1
Original nexthop: 200.1.2.1
OutLabel : NULL
Community : No-Export
AS-path : 10
Origin : igp
Attribute value : pref-val 0
State : valid, external, best,
# Display advertisement information for the route 9.1.1.0 on Switch B.
[SwitchB] display bgp routing-table ipv4 9.1.1.0 advertise-info
BGP local router ID: 2.2.2.2
Local AS number: 20
Paths: 1 best
BGP routing table information of 9.1.1.0/24:
Not advertised to any peers yet
# Display the BGP routing table on Switch C.
[SwitchC] display bgp routing-table ipv4
Total number of routes: 0
The output shows BGP has not learned any route.
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