H3C Technologies H3C S12500-X Series Switches - Manual (Page 249)

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Configuring a large-scale BGP network
In a large network, the number of BGP connections is huge and BGP configuration and maintenance are
complicated. To simply BGP configuration, you can use the peer group, community, route reflector, and
confederation features as needed. For more information about configuring peer groups, see
"
1155H
Configuring a BGP peer group ."
336B
Configuring BGP community
By default, a router does not advertise the COMMUNITY or extended community attribute to its peers or
peer groups. When the router receives a route carrying the COMMUNITY or extended community
attribute, it removes the attribute before advertising the route to other peers or peer groups.
Perform this task to enable a router to advertise the COMMUNITY or extended community attribute to its
peers for route filtering and control. You can also reference a routing policy to add or modify the
COMMUNITY or extended community attribute for specific routes. For more information about routing
policy, see "
1156H
Configuring routing policies ."
To configure BGP community (IPv4):
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter BGP view or BGP-VPN
instance view.
• Enter BGP view:
bgp as-number
• Enter BGP-VPN instance view:
a. bgp as-number
b. ip vpn-instance
vpn-instance-name
N/A
3. Enter BGP IPv4 unicast
address family view or
BGP-VPN IPv4 unicast
address family view.
address-family ipv4 [ unicast ] N/A
4. Advertise the COMMUNITY
or extended community
attribute to a peer or peer
group.
• Advertise the COMMUNITY
attribute to a peer or peer
group:
peer { group-name |
ip-address }
advertise-community
• Advertise the extended
community attribute to a peer
or peer group:
peer { group-name |
ip-address }
advertise-ext-community
By default, the COMMUNITY or
extended community attribute is
not advertised.
5. (Optional.) Apply a routing
policy to routes advertised to
a peer or peer group.
peer { group-name | ip-address }
route-policy route-policy-name
export
By default, no routing policy is
applied.
To configure BGP community (IPv6):