HP MSR2000/3000/4000 Router Series MPLS Configuration Guide

131
Ste
p
Command Remarks
8. (Optional.) Allow the local AS
number to appear in the
AS_PATH attribute of a received
route, and set the maximum
number of repetitions.
peer { group-name | ip-address }
allow-as-loop [ number ]
By default, BGP discards
incoming route updates that
contain the local AS number.
BGP detects routing loops by
examining AS numbers. 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 AS number
of the PE. Therefore, the route
updates that the PE receives
from the CE also include the
AS number of the PE. This
causes the PE to be unable to
receive the route updates. In
this case, you must configure
this command to allow
routing loops.
2. Configure the CE:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter BGP view.
bgp as-number N/A
3. Configure the PE as a BGP peer.
peer { group-name | ip-address }
as-number as-number
By default, no BGP peer is
created.
4. Create and enter BGP IPv4
unicast family view.
address-family ipv4 [ unicast ] N/A
5. Enable IPv4 unicast route
exchange with the specified peer
or peer group.
peer { group-name | ip-address }
enable
By default, BGP does not
exchange IPv4 unicast routes
with any peer.
6. (Optional.) Configure route
redistribution.
import-route protocol [ { process-id |
all-processes } [ med med-value |
route-policy route-policy-name ] * ]
A CE must redistribute its
routes to the PE so the PE can
advertise them to the peer CE.
Configuring IBGP between a PE and a CE
Use IBGP between PE and CE only in a basic MPLS L3VPN network. In networks such as Hub&Spoke,
Extranet, inter-AS VPN, carrier's carrier, nested VPN, and HoVPN, you cannot use IBGP between PE and
CE.
1. Configure the PE:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter BGP view.
bgp as-number N/A