HP HSR6800 Configuration Manual page 276

Configuring EBGP between a PE and a CE
1. Configure the PE:
Step
1. Enter system view.
2. Enable BGP and enter BGP
view.
3. Enter BGP VPN instance
view.
4. Configure the CE as the
VPN EBGP peer.
5. Redistribute the routes of the
local CEs.
6. Configure BGP to filter
routes to be advertised.
7. Configure BGP to filter
received routes.
8. Allow the local AS number to
appear in the AS_PATH
attribute of a received route
and set the maximum
number of repetitions.
2. Configure the CE:
Step
1. Enter system view.
2. Enter BGP view.
3. Configure the PE as the
EBGP peer.
Command
system-view
bgp as-number
ipv4-family vpn-instance
vpn-instance-name
peer { group-name | ip-address }
as-number as-number
import-route protocol
[ process-id ] [ med med-value |
route-policy route-policy-name ]
*
filter-policy { acl-number |
ip-prefix ip-prefix-name } export
[ direct | isis process-id | ospf
process-id | rip process-id |
static ]
filter-policy { acl-number |
ip-prefix ip-prefix-name } import
peer { group-name | ip-address }
allow-as-loop [ number ]
Command
system-view
bgp as-number
peer { group-name | ip-address }
as-number as-number
268
Remarks
N/A
N/A
N/A
N/A
A PE must redistribute the routes
of the local CEs into its VPN
routing table so it can advertise
them to the peer PE.
Optional.
By default, BGP does not filter
routes to be advertised.
Optional.
By default, BGP does not filter
received routes.
Optional.
Required for a hub-spoke
network.
BGP detects routing loops by AS
number. In a hub-spoke network
where EBGP is running between
a PE and a CE, the routing
information the PE advertises to a
CE carries the number of the AS
where the PE resides. Therefore,
the route updates that the PE
receives from the CE also include
the number of the AS where the
PE resides. This causes the PE
unable to receive the route
updates. In this case, you must
configure this command to allow
routing loops.
Remarks
N/A
N/A
For more information about BGP
peer and peer group
configuration, see Layer 3—IP
Routing Configuration Guide. This
chapter does not differentiate
between peer and peer group.