HP HPE FlexNetwork 7500 series, Configuration Manual

Page: 217 / 592

205
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.
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.
BGP multi-instance
A BGP router can run multiple BGP processes. Each BGP process corresponds to a BGP instance.
BGP maintains an independent routing table for each BGP instance.
You can create multiple public address families for a BGP instance. However, each public address
family (except for public IPv4 unicast, public IPv6 unicast, public VPNv4, and public VPNv6 address
families) can belong to only one BGP instance.
You can create multiple VPN instances for a BGP instance, and each VPN instance can have
multiple address families. A VPN instance can belong to only one BGP instance.
Different BGP instances can have the same AS number but cannot have the same name.
BGP configuration views
BGP uses different views to manage routing information for different BGP instances, address
families, and 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 instance.
Table 16 describes different BGP configuration views.
Table 16 BGP configuration views
View names Ways to enter the views Remarks
BGP instance view
<Sysname> system-view
[Sysname] bgp 100 instance abc
[Sysname-bgp-abc]
You can create a BGP instance and
enter its view by specifying the
instance keyword in the bgp
command.
Configurations in this view apply to
all public address families for the
specified BGP instance and all VPN
instances (such as confederation,
GR, and logging configurations), or
apply to all public address families
for the specified BGP instance.
BGP IPv4 unicast address
family view
<Sysname> system-view
[Sysname] bgp 100 instance abc
[Sysname-bgp-abc]
address-family ipv4 unicast
[Sysname-bgp-abc-ipv4]
Configurations in this view apply to
public IPv4 unicast routes and peers
of the specified BGP instance.
BGP IPv6 unicast address
family view
<Sysname> system-view
[Sysname] bgp 100 instance abc
[Sysname-bgp-abc]
address-family ipv6 unicast
[Sysname-bgp-abc-ipv6]
Configurations in this view apply to
public IPv6 unicast routes and peers
of the specified BGP instance.