H3C Technologies H3C S12500-X Series Switches - Manual (Page 198)

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MP-BGP uses these two attributes to advertise feasible and unfeasible routes for different network layer
protocols. BGP speakers not supporting MP-BGP ignore updates containing these attributes and do not
forward them to its peers.
The current MP-BGP implementation supports multiple protocol extensions, including VPN, IPv6, and
multicast. For more information about VPN, see MPLS Configuration Guide.
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Address family
MP-BGP uses address families and subsequent address families to identify different network layer
protocols for routes contained in the MP_REACH_NLRI and MP_UNREACH_NLRI attributes. For example,
an Address Family Identifier (AFI) of 2 and a Subsequent Address Family Identifier (SAFI) of 1 identify
IPv6 unicast routing information carried in the MP_REACH_NLRI attribute. For address family values, see
RFC 1700.
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BGP configuration views
BGP uses different views to manage routing information for different address families and different VPN
instances. Most BGP commands are available in all BGP views. BGP supports multiple VPN instances by
establishing a separate routing table for each VPN.
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Table 7 describes different BGP views.
Table 7 BGP views
View names Ways to enter the views Remarks
BGP view
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp]
Configurations in this view are
effective for routes and peers of all
address families on the public
network and in all VPN instances
(such as confederation, GR, and
logging configurations), or only for
routes and peers of all address
families on the public network.
BGP IPv4 unicast address
family view
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] address-family
ipv4 unicast
[Sysname-bgp-ipv4]
Configurations in this view are
effective for IPv4 unicast routes and
peers on the public network.
BGP IPv6 unicast address
family view
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] address-family
ipv6 unicast
[Sysname-bgp-ipv6]
Configurations in this view are
effective for IPv6 unicast routes and
peers on the public network.
BGP VPNv4 address family
view
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] address-family
vpnv4
[Sysname-bgp-vpnv4]
Configurations in this view are
effective for VPNv4 routes and peers.
For more information about BGP
VPNv4 address family view, see
MPLS Configuration Guide.