HP FlexNetwork HSR6600 Configuration Manual page 237

Execute the peer ebgp-max-hop command to enable the local router to establish an EBGP
session to an indirectly-connected peer, because the PEs are not directly connected.
Specify the ASBR in the same AS as an IBGP peer, and enable BGP to exchange labeled
IPv4 unicast routes with the ASBR.
•
ASBR configuration:
Configure a routing protocol, and enable MPLS and LDP on the interface connected to an
internal router of the AS.
Specify the PE in the same AS as an IBGP peer, and the ASBR in a different AS as an
EBGP peer.
Enable BGP to exchange labeled IPv4 unicast routes with the PE in the same AS and the
ASBR in different AS.
Enable MPLS capability on the interface connected to the ASBR in another AS. There is no
need to configure a label distribution protocol, for example, LDP.
(Optional.) Configure a routing policy to determine which IPv4 unicast routes are advertised
to the IBGP or EBGP peer with MPLS labels.
In addition, configure BGP to advertise routes destined for a PE on PEs or ASBRs. For more
information, see Layer 3—IP Routing Configuration Guide.
Configuring a PE
To configure a PE for inter-AS option C:
Step
1. Enter system view.
2. Enter BGP instance view.
3. Configure the ASBR in the
same AS as an IBGP peer.
4. Configure the PE of another
AS as an EBGP peer.
5. Create the BGP IPv4 unicast
address family and enter its
view.
6. Enable BGP to exchange
IPv4 unicast routes with the
ASBR in the same AS.
7. Enable BGP to exchange
labeled IPv4 routes with the
ASBR in the same AS.
8. Return to BGP instance view.
9. Enter BGP VPNv4 address
family view.
10. Enable BGP to exchange
VPNv4 routes with the PE in
different ASs.
Command
system-view
bgp as-number [ instance
instance-name ]
peer { group-name | ipv4-address
[ mask-length ] } as-number
as-number
peer { group-name | ipv4-address
[ mask-length ] } as-number
as-number
address-family ipv4 [ unicast ]
peer { group-name | ipv4-address
[ mask-length ] } enable
peer { group-name | ipv4-address
[ mask-length ] }
label-route-capability
quit
address-family vpnv4
peer { group-name | ipv4-address
[ mask-length ] } enable
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Remarks
N/A
N/A
By default, no BGP peers exist.
By default, no BGP peers exist.
By default, the BGP IPv4 unicast
address family is not created.
By default, BGP does not
exchange IPv4 unicast routes with
any peer.
By default, BGP cannot exchange
labeled routes with any IPv4 peer
or peer group.
N/A
N/A
By default, BGP cannot exchange
VPNv4 routes with any peer.