HP MSR2000/3000/4000 Router Series MPLS Configuration Guide
145
Configuring EBGP between an MCE and a VPN site
To run EBGP between an MCE and a VPN site, you must configure a BGP peer for each VPN instance
on the MCE, and redistribute the IGP routes of each VPN instance on the VPN site.
You can configure filtering policies to filter received routes and advertised routes.
1. Configure the MCE:
Routes redistributed from OSPF to BGP have their OSPF attributes removed. To enable BGP to
distinguish routes redistributed from different OSPF domains, you must enable the redistributed
routes to carry the OSPF domain ID by configuring the domain-id command in OSPF view. The
domain ID is added to BGP VPN routes as an extended community attribute.
To configure the MCE:
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter BGP view.
bgp as-number N/A
3. Enter BGP-VPN view.
ip vpn-instance vpn-instance-name N/A
4. Configure an EBGP peer.
peer { group-name | ip-address }
as-number as-number
By default, no BGP peer is
configured.
5. Enter BGP-VPN IPv4 unicast
address family view.
address-family ipv4 [ unicast ] N/A
6. Enable BGP to exchange
IPv4 unicast routes with the
peer.
peer { group-name | ip-address } enable
By default, BGP does not
exchange IPv4 unicast
routes with any peer.
7. Allow the local AS number
to appear in the AS_PATH
attribute of routes received
from the peer, 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.
The routing information the
MCE advertises to a site
carries the local AS number.
Therefore, the route updates
that the MCE receives from
the site also include the
local AS number. This
causes the MCE to be
unable to receive the route
updates. In this case, you
must configure this
command to allow routing
loops.
8. Redistribute remote site
routes advertised by the PE
into BGP.
import-route protocol [ { process-id |
all-processes } [ med med-value |
route-policy route-policy-name ] * ]
By default, no routes are
redistributed into BGP.